Knowledge (XXG)

Ap and Bp stars

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is a good approximation and provides an explanation as to why there is an apparent periodic variation in the magnetic field, as if such a field is not aligned with the rotation axis—the field strength will change as the star rotates. In support of this theory it has been noted that the variations in
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Auriere, M.; Wade, G. A.; Konstantinova-Antova, R.; Charbonnel, C.; Catala, C.; Weiss, W. W.; Roudier, T.; Petit, P.; Donati, J.-F.; Alecian, E.; Cabanac, R.; Van Eck, S.; Folsom, C. P.; Power, J. (September 2009). "Discovery of a weak magnetic field in the photosphere of the single giant Pollux".
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within rotating cores of Ap stars; however, the oblique nature of the field cannot be produced, as yet, by this model, as invariably one ends up with a field either aligned with the rotation axis, or at 90° to it. It is also unclear whether it is possible to generate such large dipole fields using
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has to be invoked to reduce the field in normal stars. This theory does require the field to remain stable over a long period of time, and it is unclear whether such an obliquely rotating field could do so. Another problem with this theory is to explain why only a small proportion of A-type stars
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Landstreet, J. D; Bagnulo, S; Andretta, V; Fossati, L; Mason, E; Silaj, J; Wade, G. A (2007). "Searching for links between magnetic fields and stellar evolution: II. The evolution of magnetic fields as revealed by observations of Ap stars in open clusters and associations".
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this explanation, due to the slow rotation of the star. While this could be explained by invoking a fast rotating core with a high rotation gradient to the surface, it is unlikely that an ordered axisymmetric field would result.
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instability strip, on the main sequence. There are currently 35 known roAp stars. The pulsation periods of these oscillators lie between 5 and 21 minutes. The stars pulsate in high overtone, non-radial, pressure modes.
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magnetic field are inversely correlated with the rotation velocity. This model of a dipolar field, in which the magnetic axis is offset to the rotation axis, is known as the
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The spatial locations of the chemical overabundances have been shown to be connected with the geometry of the magnetic field. Some of these stars have shown
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The origin of such high magnetic fields in Ap stars is problematic and two theories have been proposed in order to explain them. The first is the
74:). Typically the magnetic field of these stars lies in the range of a few kG to tens of kG. In most cases a field which is modelled as a simple 1894: 311: 407:
Murphy, Simon J.; Saio, Hideyuki; Takada-Hidai, Masahide; Kurtz, Donald W.; Shibahashi, Hiromoto; Takata, Masao; Hey, Daniel R. (2020).
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variations and variations in radial velocities of spectral lines. These were first observed in the highly peculiar Ap star HD 101065 (
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which uses the rotation to deduce a map of the stellar surface. These patches of overabundances are often referred to as
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variations arising from pulsations of a few minutes. For studying these stars high-resolution
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Kurtz, D. W (1978). "12.15 Minute Light Variations in Przybylski's Star, HD 101065".
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than classical A- or B-type stars; in the case of HD 215441, reaching 33.5 k
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Babcock, Horace W (1960). "The 34-KILOGAUSS Magnetic Field of HD 215441".
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exhibit these high field strengths. The other generation theory is
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A and B which show overabundances of some metals, such as
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to the Sun which may have been an Ap star when on the
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The Observation and Analysis of Stellar Photospheres
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Chemically peculiar stars of spectral types A and B
413:Monthly Notices of the Royal Astronomical Society 327:Kochukhov, Oleg (2011). "The spots on Ap stars". 524: 8: 306:. Cambridge University Press. pp. 13–. 756: 531: 517: 509: 146:, exhibit short-timescale, millimagnitude 472: 442: 424: 340: 260: 154:). These stars lie at the bottom of the 142:A subset of this class of stars, called 203: 382:Information Bulletin on Variable Stars 7: 144:rapidly oscillating Ap (roAp) stars 300:David F. Gray (17 November 2005). 14: 2020: 2010: 2009: 62:Ap and Bp stars have stronger 1: 1922:Timeline of stellar astronomy 329:Physics of Sun and Star Spots 461:Astronomy & Astrophysics 132:Rapidly oscillating Ap stars 1582:Hertzsprung–Russell diagram 491:10.1051/0004-6361/200912050 138:rapidly oscillating Ap star 2074: 1496:Kelvin–Helmholtz mechanism 279:10.1051/0004-6361:20077343 249:Astronomy and Astrophysics 135: 2005: 759: 546: 359:10.1017/S1743921311015328 24:chemically peculiar stars 1875:With multiple exoplanets 661:Asymptotic giant branch 483:2009A&A...504..231A 271:2007A&A...470..685L 120:is used, together with 88:fossil field hypothesis 1997:Tidal disruption event 1486:Circumstellar envelope 720:Luminous blue variable 444:10.1093/mnras/staa2667 174:Stellar classification 1522:Effective temperature 213:Astrophysical Journal 81:oblique rotator model 1992:Planet-hosting stars 1870:With resolved images 1841:Historical brightest 1771:Photometric-standard 1697:Solar radio emission 1491:Eddington luminosity 1271:Triple-alpha process 1209:Thorne–Żytkow object 584:Young stellar object 1816:Highest temperature 1587:Color–color diagram 1452:Protoplanetary disk 1256:Proton–proton chain 934:Chemically peculiar 435:2020MNRAS.498.4272M 394:1978IBVS.1436....1K 351:2011IAUS..273..249K 225:1960ApJ...132..521B 96:ambipolar diffusion 92:interstellar medium 52:A- and B-type stars 26:(hence the "p") of 1821:Lowest temperature 1572:Photometric system 1542:Absolute magnitude 1476:Circumstellar dust 1089:Stellar black hole 725:Stellar population 611:Herbig–Haro object 2035: 2034: 1938:Substellar object 1917:Planetary nebulae 1336:Luminous red nova 1246:Deuterium burning 1232: 1231: 715:Instability strip 695:Wolf-Rayet nebula 649:Horizontal branch 594:Pre-main-sequence 313:978-0-521-85186-2 152:Przybylski's star 2065: 2027:Stars portal 2025: 2024: 2013: 2012: 1669:Planetary system 1592:Strömgren sphere 1464:Asteroseismology 1185:Black hole star 757: 683:Planetary nebula 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1031: 1030: 1028: 1026: 1022: 1016: 1013: 1009: 1006: 1005: 1004: 1001: 999: 996: 992: 989: 988: 987: 984: 980: 977: 975: 972: 970: 969:Lambda Boötis 967: 965: 962: 960: 957: 955: 952: 950: 947: 945: 942: 940: 937: 936: 935: 932: 930: 927: 923: 920: 918: 915: 913: 910: 909: 908: 905: 901: 898: 897: 896: 893: 889: 886: 884: 881: 879: 876: 875: 874: 871: 869: 866: 862: 859: 857: 854: 852: 849: 848: 847: 844: 842: 839: 837: 834: 832: 829: 825: 822: 820: 817: 816: 815: 812: 808: 805: 803: 800: 798: 795: 793: 790: 788: 785: 783: 780: 778: 775: 774: 772: 770: 767: 765: 762: 761: 758: 755: 753: 749: 741: 738: 736: 735:Superluminous 733: 732: 731: 728: 726: 723: 721: 718: 716: 713: 711: 708: 706: 703: 701: 698: 696: 693: 689: 686: 685: 684: 681: 679: 676: 672: 669: 667: 664: 663: 662: 659: 655: 652: 651: 650: 647: 645: 642: 640: 639:Main sequence 637: 636: 634: 632: 628: 622: 619: 617: 616:Hayashi track 614: 612: 609: 605: 602: 600: 597: 595: 592: 590: 587: 586: 585: 582: 580: 577: 575: 572: 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1094:X-ray binary 1033:Compact star 943: 868:Bright giant 621:Henyey track 599:Herbig Ae/Be 464: 460: 453: 416: 412: 402: 385: 381: 375: 332: 328: 322: 302: 295: 252: 248: 241: 216: 212: 206: 143: 141: 125: 118:spectroscopy 111: 100: 87: 85: 80: 61: 44:praseodymium 19: 18: 1943:Brown dwarf 1719:Circumpolar 1597:Kraft break 1577:Color index 1552:Metallicity 1512:Designation 1481:Cosmic dust 1403:Photosphere 1169:Dark-energy 1144:Electroweak 1129:Black dwarf 1060:Radio-quiet 1043:White dwarf 929:White dwarf 579:Bok globule 419:(3): 4272. 156:Delta Scuti 148:photometric 70:(3.35  2042:Categories 1905:Candidates 1900:Supernovae 1885:Red dwarfs 1744:Extinction 1532:Kinematics 1527:Luminosity 1505:Properties 1398:Atmosphere 1296:Si burning 1286:Ne burning 1224:White hole 1197:Quasi-star 1124:Blue dwarf 979:Technetium 895:Hypergiant 873:Supergiant 426:2009.00730 255:(2): 685. 198:References 1836:Brightest 1734:Magnitude 1714:Pole star 1635:Symbiotic 1630:Eclipsing 1562:Starlight 1363:Structure 1353:Supernova 1346:Micronova 1341:Recurrent 1326:Symbiotic 1311:p-process 1306:r-process 1301:s-process 1291:O burning 1281:C burning 1261:CNO cycle 1204:Gravastar 740:Hypernova 730:Supernova 705:Dredge-up 678:Blue loop 671:super-AGB 654:Red clump 631:Evolution 589:Protostar 569:Accretion 561:Formation 499:0004-6361 474:0907.1423 367:118436816 342:1010.0264 262:0706.0330 188:red giant 48:neodymium 32:strontium 2048:Ap stars 2015:Category 1910:Remnants 1806:Extremes 1766:Parallax 1739:Apparent 1729:Asterism 1707:Sunlight 1657:Globular 1642:Multiple 1567:Variable 1557:Rotation 1517:Dynamics 1408:Starspot 1082:Magnetar 1025:Remnants 841:Subgiant 814:Subdwarf 666:post-AGB 287:15591645 163:See also 40:europium 36:chromium 1982:Gravity 1931:Related 1851:Nearest 1799:Chinese 1647:Cluster 1620:Contact 1457:Proplyd 1331:Remnant 1219:Blitzar 1193:Hawking 1149:Strange 1099:Burster 1055:Neutron 1008:Extreme 959:He-weak 604:T Tauri 479:Bibcode 431:Bibcode 390:Bibcode 347:Bibcode 335:: 249. 267:Bibcode 221:Bibcode 219:: 521. 1972:Galaxy 1960:Planet 1948:Desert 1856:bright 1794:Arabic 1615:Binary 1435:Bubble 1159:Planck 1134:Exotic 1070:Binary 1065:Pulsar 1003:Helium 964:Barium 907:Carbon 900:Yellow 888:Yellow 861:Yellow 700:PG1159 497:  365:  310:  285:  184:Pollux 76:dipole 1977:Guest 1781:Lists 1662:Super 1316:Fusor 1189:Black 1174:Quark 1154:Preon 1139:Boson 1075:X-ray 991:Shell 944:Ap/Bp 846:Giant 764:Early 710:OH/IR 540:Stars 469:arXiv 421:arXiv 388:: 1. 363:S2CID 337:arXiv 283:S2CID 257:arXiv 38:, or 1652:Open 1547:Mass 1371:Core 1321:Nova 1214:Iron 1164:Dark 974:Lead 954:HgMn 949:CEMP 878:Blue 851:Blue 769:Late 551:List 495:ISSN 386:1436 308:ISBN 46:and 22:are 1953:Sub 1687:Sun 1106:SGR 883:Red 856:Red 487:doi 465:504 439:doi 417:498 355:doi 333:273 275:doi 253:470 229:doi 217:132 2044:: 986:Be 939:Am 922:CH 917:CN 836:OB 831:WR 493:. 485:. 477:. 463:. 437:. 429:. 415:. 411:. 384:. 361:. 353:. 345:. 331:. 281:. 273:. 265:. 251:. 227:. 215:. 128:. 83:. 34:, 1179:Q 998:B 912:S 824:B 819:O 807:M 802:K 797:G 792:F 787:A 782:B 777:O 532:e 525:t 518:v 501:. 489:: 481:: 471:: 447:. 441:: 433:: 423:: 396:. 392:: 369:. 357:: 349:: 339:: 316:. 289:. 277:: 269:: 259:: 235:. 231:: 223:: 72:T 68:G

Index

chemically peculiar stars
spectral types
strontium
chromium
europium
praseodymium
neodymium
A- and B-type stars
magnetic fields
G
T
dipole
interstellar medium
ambipolar diffusion
radial velocity
spectroscopy
Doppler imaging
rapidly oscillating Ap star
photometric
Przybylski's star
Delta Scuti
Peculiar star
Stellar classification
Doppler imaging
Pollux
red giant
main sequence
Bibcode
1960ApJ...132..521B
doi

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