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Homunculus Nebula

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two lobes was formed by "pinching" from a dense surrounding material have been disproved, and the bipolar shells are now believed to be caused by concentrated polar outflows of material, with the equatorial skirt formed by breakout of faster ejected material through the thinnest parts of the shells. The ejection of material preferentially along the axis of rotation of the stars, or of the binary orbit, may be due to the rotation of Eta Carinae A itself resulting in stronger mass loss towards the poles.
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onto the line of sight. Assuming an origin in Eta Carinae's Great Eruption and a constant expansion velocity, this gives the linear distance of the shell from the central star projected along the line of sight. The difference between the reflected line doppler shift velocity and the direct line velocity gives the distance of the shell from the central star, again assuming expansion at constant velocity since the Great Eruption.
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in relatively thin shells concentrated towards the poles. The shells consist of two components, an inner warm region and a more massive outer cool skin. The shells are smooth and thin suggesting they were ejected in as little as five years, but there are streaks of thicker dust detectable within the shells.
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The bipolar nebula is angled so that the NW lobe is further away from Earth than the SE lobe is. The whole nebula is expanding so that the SE lobe is blue-shifted and the NW lobe is red-shifted, relative to the central source. The lobes contain the majority of the material in the Homunculus Nebula,
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long. It was measured to be expanding at a rate which was consistent with having originated in an explosion in the mid 19th century. At that time the shape of the nebula showed a central bulge with a single large lump to the northwest and two smaller extensions to the southeast, which was described
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The Homunculus Nebula is a virtually unique structure, believed to result from the extremely young age. This means that the shape and structure is almost entirely due to the original eruption rather than the interaction with surrounding interstellar material. Suggestions that the waist between the
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radiation from dust heated by the stars within. Overlaid on this is some light from the stars themselves reflected mostly from dense features within the nebulosity, showing strong visual and UV spectral lines in emission. There are also emission lines from ionised gas where it collides with slower
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The equatorial skirt appears to contain material of the same age and younger than the lobes. It contains a much smaller mass of material than the lobes, shining mainly by reflected light which escapes most easily at equatorial latitudes. There is less dust and little molecular hydrogen compared to
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Each lobe has polar "hole" although it is not known whether it is an actual gap in the shell of the lobe or just a deep indentation. Surrounding each polar hole is a "trench". The trenches are visible as approximate semicircles centred on the axis of the lobes but may form complete circles. There
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are visible primarily in light directly reflected from the Eta Carinae stars. The blobs are believed to lie near the equatorial plane of the stellar system, but their origin is unclear. Their speed has been measured, but within uncertainties they could have been emitted in the 1890 outburst or a
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Early speckle interferometry showed that the central region of the Homunculus contains four point-like sources, originally designated A1, A2, A3, and A4. The four speckle objects were later referred to as A, B, C, and D. Higher resolution studies showed that only the brightest source A was truly
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of the spectral lines at that point, assuming the lobes are symmetrical. There are two different doppler shifts visible in the spectrum: one for direct emission lines; and one for reflected lines from Eta Carinae A. The direct line doppler shift gives the expansion velocity of the shell project
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The Homunculus and Eta Carinae are assumed to be at approximately the same distance as Trumpler 16 and the Carina Nebula, but the distances to these objects are not known with any great accuracy. Instead, the distance of the Homunculus Nebula itself can be calculated using measurements of its
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The thinness of the bipolar shells argues for their ejection within approximately five years. Irregularities in the otherwise very smooth structure of the shells are conjectured to result from interactions between the winds of the two central stars, and from their orbital motion.
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Observations of the spectrum of the Homunculus at a particular angular distance from the central star has shown the actual linear distance of that point from the central star, which defines the distance. Values obtained using this method are around
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are other smaller irregular indentations and protrusions to the lobes, which are symmetrical with the same features appearing on each lobe. These include flattened protrusions at about 10° latitude, one on each lobe (labeled "Protrusions" in the
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The same calculations also return the inclination of the axis of the Homunculus relative to the line of sight. This turns out to be 41°, or 49° relative to the plane of the sky, which means it is slightly more "end on" than "side on".
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The mass of the nebula cannot be determined directly. However, the amount of dust can be measured fairly accurately and estimates of the gas to dust ratio used to calculate the total mass. The total dust mass is calculated at
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The reflected spectrum of the Homunculus lobes varies with position, due to the central star emitting different radiation at different latitudes on its surface. This is the only star for which such an effect can be observed.
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of gas are contained in the Homunculus itself. Nearly as much material is detected within outer ejecta, which formed earlier, but within the last thousand years. Older calculations had produced consensus estimates of
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long. There is also a ragged equatorial skirt of material which can be seen faintly in deep images at certain wavelengths. The lobes are mostly hollow with the material strongly concentrated towards the poles.
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but at lower levels of ionisation due to the lower temperatures of the central stars. The strongest lines are and , similar to those from the stellar winds of the stars themselves, but with narrower profiles.
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The Homunculus was ejected in an enormous outburst from Eta Carinae. Light from this event reached Earth in 1841, when Eta Carinae briefly became the second-brightest star in the sky, after
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Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars".
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The spectrum of the Homunculus is complex, consisting of reflected, thermal, and emission components at wavelengths across the electromagnetic spectrum. The dominant feature is
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In 1914, Eta Carinae was reported to have a faint companion and also to be non-stellar. Observations in 1944 and 1945 showed a somewhat elongated nebulosity around
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The Homunculus consists of two lobes, referred to as northwest (NW) and southeast (SE) based on their orientation as seen from Earth. Each is approximately
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1941 event. The situation is complicated further by the likely acceleration of their slow movement due to the intense stellar winds.
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Steffen, W.; Teodoro, M.; Madura, T. I.; Groh, J. H.; Gull, T. R.; Mehner, A.; Corcoran, M. F.; Damineli, A.; Hamaguchi, K. (2014).
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Smith, Nathan (2006). "The Structure of the Homunculus. I. Shape and Latitude Dependence from H2and Velocity Maps of η Carinae".
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moving material or is excited by high energy electromagnetic radiation from the stars. The ionisation emission is similar to a
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Abraham, Zulema; Falceta-Gonçalves, Diego; Beaklini, Pedro P. B. (2014). "Η Carinae Baby Homunculus Uncovered by A/km/kmLMA".
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expansion. The velocity of particular locations within the thin shell of the Homunculus lobes can be measured using the
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Gomez, H. L.; Vlahakis, C.; Stretch, C. M.; Dunne, L.; Eales, S. A.; Beelen, A.; Gomez, E. L.; Edmunds, M. G. (2010).
1804: 949:"Highest Resolution Image of Eta Carinae - VLT Interferometer captures raging winds in famous massive stellar system" 2360: 1344: 155: 1794: 1262: 387:
and emit x-ray radiation. The lobes of the Homunculus emit copious radio waves, including emission in the
2355: 1730: 1251: 607:"Near-infrared integral field spectroscopy of the Homunculus nebula around η Carinae using Gemini/CIRPASS" 364: 118: 2179: 1995: 1567: 1105:"A moderately precise dynamical age for the Homunculus of Eta Carinae based on 13 years of HST imaging" 1170: 1126: 1072: 1041: 996: 914: 852: 804: 767: 726: 669: 628: 571: 519: 303:. Carina Nebula (left), Homunculus Nebula (center), and high resolution image of Eta Carinae (right). 2209: 201: 1799: 1116: 1014: 986: 930: 904: 842: 695: 646: 618: 587: 561: 418: 414: 94: 309: 295: 1286: 1157:
Davidson, Kris; Smith, Nathan; Gull, Theodore R.; Ishibashi, Kazunori; Hillier, D. J. (2001).
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Weigelt, G.; Ebersberger, J. (1986). "Eta Carinae resolved by speckle interferometry".
168: 147: 1159:"The Shape and Orientation of the Homunculus Nebula Based on Spectroscopic Velocities" 231:, and within that a shell of shocked material from stellar winds that has been called 2349: 2174: 2059: 1334: 1314: 1018: 1009: 974: 641: 606: 583: 465: 246: 197: 113: 934: 591: 443:. This date is inconsistent with the peaks in brightness and with estimates of the 267: 2094: 1984: 1945: 1940: 1935: 1930: 1925: 1920: 1557: 1522: 1512: 1507: 1502: 1497: 1492: 1482: 1477: 1472: 1467: 1457: 1452: 1447: 1442: 1432: 1319: 1299: 699: 650: 2316: 2089: 2084: 2079: 1965: 1849: 1844: 1839: 1824: 1552: 1547: 1542: 1537: 1532: 1329: 1309: 681: 455: 404: 300: 204: 185: 179: 73: 2311: 2184: 2054: 2049: 1970: 1960: 1955: 1950: 1834: 1829: 1427: 1422: 1417: 1412: 1407: 1402: 1397: 1392: 1387: 1382: 1377: 715:"Η Argûs, Magnitude of, in 1914, and the discovery of a close companion to it" 531: 444: 432:
Analysis of the expansion of the nebula has given a time for its formation at
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Teodoro, M.; Damineli, A.; Sharp, R. G.; Groh, J. H.; Barbosa, C. L. (2008).
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stellar, and the other three were small nebular condensations. The three
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disk, all moving outward at up to 670 km/s (1,500,000 mph).
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Shock waves at the outer edge of the ejecta are heated to millions of
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Dorland, Bryan N.; Currie, Douglas G.; Hajian, Arsen R. (2004).
439: 1224: 831:"The three-dimensional structure of the Eta Carinae Homunculus" 795:
Thackeray, A. D. (1949). "Nebulosity surrounding eta Carinae".
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Homunculus Nebula around Eta Carinae (HST UV and visual image)
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Monthly Notices of the Royal Astronomical Society: Letters
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explosion produced two polar lobes, and a large but thin
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Bipolar emission nebula in the constellation Carina
1109:Monthly Notices of the Royal Astronomical Society 835:Monthly Notices of the Royal Astronomical Society 719:Monthly Notices of the Royal Astronomical Society 611:Monthly Notices of the Royal Astronomical Society 363:Ultraviolet image of Homunculus Nebula taken by 664:Smith, Nathan (2012). "All Things Homunculus". 1236: 8: 100:6.21 (-0.8–7.9) (including the central star) 19: 1212:Astronomy Picture of the day (animated GIF) 1152: 1150: 890: 888: 886: 884: 882: 880: 878: 876: 2299: 2273: 2233: 2113: 1991: 1908: 1282: 1243: 1229: 1221: 323:, leading to estimates that up to 40  41: 1182: 1138: 1120: 1084: 1008: 990: 908: 864: 846: 824: 822: 820: 818: 779: 738: 640: 622: 565: 547: 545: 543: 541: 1098: 1096: 666:Eta Carinae and the Supernova Impostors 499: 78:−59° 41′ 04″ 1216:Little Homunculus and Butterfly Nebula 18: 505: 503: 7: 271:A 3D model of the Homunculus Nebula. 178:surrounding the massive star system 227:Within the Homunculus is a smaller 14: 2332: 2331: 1010:10.1111/j.1745-3933.2009.00784.x 756:"Eta Carinae. I. The Nebulosity" 642:10.1111/j.1365-2966.2008.13264.x 447:passage of the secondary star. 2260:Carina Dwarf Spheroidal Galaxy 480:with a margin of error around 1: 1204:Astronomy Picture of the Day 1268:Carina in Chinese astronomy 1210:Expanding Homunculus Nebula 682:10.1007/978-1-4614-2275-4_7 2387: 1034:Astronomy and Astrophysics 584:10.1088/0004-637X/791/2/95 512:Astronomy and Astrophysics 402: 2329: 2298: 2272: 1907: 1258: 897:The Astrophysical Journal 554:The Astrophysical Journal 153: 40: 31: 1163:The Astronomical Journal 1065:The Astronomical Journal 713:Innes, R. T. A. (1914). 125:Physical characteristics 1263:List of stars in Carina 1252:Constellation of Carina 1046:1986A&A...163L...5W 532:10.1888/0333750888/2862 524:2000A&A...355L..27H 105:Apparent dimensions (V) 2366:Carina (constellation) 1103:Smith, Nathan (2017). 740:10.1093/mnras/74.8.697 460: 367: 304: 272: 2180:Finger of God Globule 1971:HD 95086 b (Levantes) 1140:10.1093/mnras/stx1868 866:10.1093/mnras/stu1088 760:Astrophysical Journal 458: 362: 298: 270: 239:Observational history 1201:3D Homunculus Nebula 754:Gaviola, E. (1950). 2304:Astronomical events 1175:2001AJ....121.1569D 1131:2017MNRAS.471.4465S 1077:2004AJ....127.1052D 1001:2010MNRAS.401L..48G 919:2006ApJ...644.1151S 857:2014MNRAS.442.3316S 809:1949Obs....69...31T 772:1950ApJ...111..408G 731:1914MNRAS..74..697I 674:2012ASSL..384..145S 633:2008MNRAS.387..564T 576:2014ApJ...791...95A 21: 2371:Reflection nebulae 1951:HD 63765 b (Yvaga) 461: 368: 305: 273: 95:Apparent magnitude 50:Observation data: 2343: 2342: 2325: 2324: 2294: 2293: 2268: 2267: 2223: 2222: 2195:Homunculus Nebula 2103: 2102: 1979: 1978: 1903: 1902: 691:978-1-4614-2274-7 310:illustrated model 299:Detailed look on 229:Little Homunculus 176:reflection nebula 165:Homunculus Nebula 161: 160: 34:Reflection nebula 20:Homunculus Nebula 2378: 2361:Emission nebulae 2335: 2334: 2300: 2274: 2234: 2114: 1992: 1909: 1363:T (not variable) 1283: 1245: 1238: 1231: 1222: 1189: 1188: 1186: 1154: 1145: 1144: 1142: 1124: 1115:(4): 4465–4475. 1100: 1091: 1090: 1088: 1056: 1050: 1049: 1029: 1023: 1022: 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1226: 1223: 1217: 1214: 1211: 1208: 1205: 1202: 1199: 1198: 1194: 1185: 1180: 1176: 1172: 1168: 1164: 1160: 1153: 1151: 1147: 1141: 1136: 1132: 1128: 1123: 1118: 1114: 1110: 1106: 1099: 1097: 1093: 1087: 1082: 1078: 1074: 1070: 1066: 1062: 1055: 1052: 1047: 1043: 1039: 1035: 1028: 1025: 1020: 1016: 1011: 1006: 1002: 998: 993: 988: 984: 980: 976: 969: 966: 954: 950: 944: 941: 936: 932: 928: 924: 920: 916: 911: 906: 902: 898: 891: 889: 887: 885: 883: 881: 879: 877: 873: 867: 862: 858: 854: 849: 844: 840: 836: 832: 825: 823: 821: 819: 815: 810: 806: 802: 798: 791: 788: 782: 777: 773: 769: 765: 761: 757: 750: 747: 741: 736: 732: 728: 724: 720: 716: 709: 706: 701: 697: 693: 687: 683: 679: 675: 671: 667: 660: 657: 652: 648: 643: 638: 634: 630: 625: 620: 616: 612: 608: 601: 598: 593: 589: 585: 581: 577: 573: 568: 563: 559: 555: 548: 546: 544: 542: 538: 533: 529: 525: 521: 517: 513: 506: 504: 500: 494: 492: 488: 485: 478: 470: 467: 466:doppler shift 457: 450: 448: 446: 441: 430: 426: 422: 420: 416: 412: 406: 398: 396: 392: 391:of hydrogen. 390: 386: 381: 378: 373: 366: 361: 354: 352: 349: 348:Weigelt Blobs 341:Weigelt Blobs 340: 338: 313: 311: 302: 297: 293: 289: 285: 269: 262: 260: 258: 248: 238: 236: 234: 230: 225: 223: 219: 215: 214: 210: 206: 203: 199: 198:Carina Nebula 194: 187: 181: 177: 173: 170: 166: 157: 152: 149: 146: 142: 138: 134: 132: 128: 123: 120: 117: 115: 114:Constellation 111: 107: 103: 99: 96: 92: 89: 85: 81: 77: 75: 71: 65: 63: 59: 56: 53: 48: 44: 39: 35: 30: 27: 23: 2194: 2095:Westerlund 2 1946:OGLE2-TR-L9b 1941:OGLE-TR-211b 1936:OGLE-TR-182b 1931:OGLE-TR-113b 1926:OGLE-TR-132b 1921:OGLE-TR-111b 1206:2014 July 17 1166: 1162: 1112: 1108: 1068: 1064: 1054: 1037: 1033: 1027: 982: 978: 968: 956:. Retrieved 952: 943: 900: 896: 838: 834: 800: 796: 790: 763: 759: 749: 722: 718: 708: 665: 659: 614: 610: 600: 557: 553: 515: 511: 489: 471: 462: 431: 427: 423: 408: 393: 382: 369: 347: 344: 314: 306: 290: 286: 274: 256: 242: 232: 228: 226: 217: 211: 202:star-forming 164: 162: 135:0.29 ly 2317:GRB 080916C 2090:Trumpler 16 2085:Trumpler 15 2080:Trumpler 14 1966:HD 85628 Ab 1850:OGLE2-TR-L9 1845:OGLE-TR-211 1840:OGLE-TR-182 1825:NGC 3603-A1 1815:Innes' star 1800:CPD−57°2874 1295:α (Canopus) 1169:(3): 1569. 1071:(2): 1052. 953:www.eso.org 841:(4): 3316. 405:Eta Carinae 331:10-15  301:Eta Carinae 288:the lobes. 207:. From the 205:H II region 191:2,300  186:light-years 184:7,500  180:Eta Carinae 86:7,500  74:Declination 2350:Categories 2312:GRB 000131 2185:G290.1-0.8 2055:Carina OB2 2050:Carina OB1 1961:HD 65216 c 1956:HD 65216 b 1913:Exoplanets 1835:NGC 3603-C 1830:NGC 3603-B 1810:1E 1048-59 1795:AWI0005x3s 1122:1709.06210 958:20 October 725:(8): 697. 617:(2): 564. 495:References 445:periastron 419:equatorial 257:Homunculus 218:Little Man 213:homunculus 200:, a large 154:See also: 67:10 45 03.6 2075:Platais 8 1305:ε (Avior) 1019:119295262 992:0911.0176 848:1407.4096 624:0804.0240 567:1406.6297 560:(2): 95. 482:100  475:2.3  438:0.8  399:Formation 372:blackbody 316:0.4  250:wide and 222:infra-red 2337:Category 2229:Galaxies 2190:Hen 2-47 1987:clusters 1721:4325 (z) 1716:4257 (u) 1701:4177 (t) 1696:4164 (t) 1691:4159 (r) 1681:4138 (K) 1676:4114 (s) 1671:4102 (I) 1666:4089 (L) 1661:4025 (M) 1656:3884 (l) 1651:3856 (m) 1646:3825 (h) 1641:3821 (H) 1636:3728 (k) 1631:3696 (g) 1626:3663 (i) 1621:3643 (G) 1616:3598 (b) 1611:3571 (c) 1606:3415 (e) 1601:3414 (e) 1596:3260 (C) 1591:3220 (B) 1586:3159 (D) 1581:2934 (Q) 1576:2435 (N) 1513:V533 (y) 1503:V520 (w) 1493:V448 (O) 1488:V415 (A) 1483:V399 (P) 1478:V382 (x) 1473:V376 (b) 1463:V371 (z) 1458:V357 (a) 1453:V345 (E) 1448:V344 (f) 1443:V343 (d) 1433:V337 (q) 1345:Variable 935:12453761 592:62893264 451:Distance 355:Spectrum 336:☉ 328:☉ 321:☉ 279:wide by 216:meaning 182:, about 172:emission 83:Distance 2205:IC 2448 2200:IC 2220 2109:Nebulae 2070:IC 2714 2065:IC 2602 1855:Sher 25 1820:LHS 288 1171:Bibcode 1127:Bibcode 1073:Bibcode 1042:Bibcode 997:Bibcode 915:Bibcode 853:Bibcode 805:Bibcode 768:Bibcode 766:: 408. 727:Bibcode 700:6275803 670:Bibcode 651:2460614 629:Bibcode 572:Bibcode 520:Bibcode 518:: L27. 193:parsecs 169:bipolar 2215:RCW 49 1895:WR 42e 1890:WR 31a 1885:WR 30a 1865:WR 21a 1860:WR 20a 1423:PP (p) 1040:: L5. 1017:  933:  803:: 31. 698:  688:  649:  590:  434:1847.1 411:Sirius 385:kelvin 365:Hubble 131:Radius 119:Carina 2253:Other 2168:Other 2043:Other 1880:WR 25 1875:WR 24 1870:WR 22 1788:Other 1779:97950 1774:95086 1769:93403 1764:93250 1759:93129 1754:85628 1749:65216 1739:53143 1287:Bayer 1278:Stars 1117:arXiv 1015:S2CID 987:arXiv 931:S2CID 905:arXiv 843:arXiv 696:S2CID 647:S2CID 619:arXiv 588:S2CID 562:arXiv 263:Shape 255:as a 209:Latin 167:is a 55:epoch 52:J2000 2244:3059 2159:3586 2154:3584 2149:3582 2144:3581 2139:3579 2134:3576 2129:3199 2124:2867 2034:3603 2029:3532 2024:3324 2019:3293 2014:3114 2009:2808 2004:2516 1985:Star 1711:4222 1706:4205 1686:4142 1558:V906 1553:V817 1548:V816 1543:V759 1538:V752 1533:V742 1528:V640 1523:V602 1518:V560 1508:V528 1498:V518 1468:V372 1438:V341 960:2016 686:ISBN 174:and 163:The 2237:NGC 2117:NGC 1996:NGC 1179:doi 1167:121 1135:doi 1113:471 1081:doi 1069:127 1038:163 1005:doi 983:401 923:doi 901:644 861:doi 839:442 776:doi 764:111 735:doi 678:doi 637:doi 615:387 580:doi 558:791 528:doi 516:355 477:kpc 252:10″ 108:18" 97:(V) 2352:: 1731:HD 1568:HR 1428:QZ 1418:OY 1413:IX 1408:HR 1403:GG 1398:EV 1393:CK 1388:BO 1383:AG 1378:RT 1177:. 1165:. 1161:. 1149:^ 1133:. 1125:. 1111:. 1107:. 1095:^ 1079:. 1067:. 1063:. 1036:. 1013:. 1003:. 995:. 981:. 977:. 951:. 929:. 921:. 913:. 899:. 875:^ 859:. 851:. 837:. 833:. 817:^ 801:69 799:. 774:. 762:. 758:. 733:. 723:74 721:. 717:. 694:. 684:. 676:. 645:. 635:. 627:. 613:. 609:. 586:. 578:. 570:. 556:. 540:^ 526:. 514:. 502:^ 487:. 484:pc 440:yr 281:5″ 277:7″ 235:. 88:ly 1373:Y 1368:U 1358:S 1353:R 1335:ω 1330:χ 1325:υ 1315:θ 1310:η 1244:e 1237:t 1230:v 1187:. 1181:: 1173:: 1143:. 1137:: 1129:: 1119:: 1089:. 1083:: 1075:: 1048:. 1044:: 1021:. 1007:: 999:: 989:: 962:. 937:. 925:: 917:: 907:: 869:. 863:: 855:: 845:: 811:. 807:: 784:. 778:: 770:: 743:. 737:: 729:: 702:. 680:: 672:: 653:. 639:: 631:: 621:: 594:. 582:: 574:: 564:: 534:. 530:: 522:: 436:± 333:M 325:M 318:M 247:″ 245:5 189:(

Index

Emission nebula
Reflection nebula

J2000
epoch
Right ascension
Declination
ly
Apparent magnitude
Constellation
Carina
Radius
Bipolar nebula
Lists of nebulae
bipolar
emission
reflection nebula
Eta Carinae
light-years
parsecs
Carina Nebula
star-forming
H II region
Latin
homunculus
infra-red



Eta Carinae

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