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Be star

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With the understanding of the processes of emission line formation in the early 20th century it became clear that these lines in Be stars must come from circumstellar material ejected from the star helped by the rapid rotation of the star. All the observational characteristics of Be stars can now be
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Some Be stars exhibit spectral features that are interpreted as a detached "shell" of gas surrounding the star, or more accurately a disc or ring. These shell features are thought to be caused when the disc of gas that is present around many Be stars is aligned edge on to us so that it creates very
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explained with a gaseous disk that is formed of material ejected from the star. The infrared excess and the polarization result from the scattering of stellar light in the disk, while the line emission is formed by re-processing stellar ultraviolet light in the gaseous disc.
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when a transient or variable disk is observed. Be stars that show variability without clear indication of the mechanism are listed simply as BE in the
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lines in emission. These are sometimes referred to as classical Be stars. The emission lines may be present only at certain times.
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Although the Be type spectrum is most strongly produced in class B stars, it is also detected in O and A
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Be stars are often visually and spectroscopically variable. Be stars can be classified as
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Rivinius, Thomas; Carciofi, Alex C.; Martayan, Christophe (2013). "Classical Be stars".
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Struve, Otto (1931). "On the Origin of Bright Lines in Spectra of Stars of Class B".
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Many stars have B-type spectra and show hydrogen emission lines, including many
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and emission lines. A narrower definition, sometimes referred to as
433:"The influence of rotation and stellar winds upon the Be phenomenon" 311: 37: 2080: 493: 457: 432: 416: 391: 375: 350: 231: 206: 263: 36: 556: 392:"Evidence for mass loss at moderate to high velocity in Be stars" 1399: 1379: 598: 571: 1745: 64:
B star whose spectrum has, or had at some time, one or more
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Merrill, P. W.; Humason, M. L.; Burwell, C. G. (1925).
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Publications of the Astronomical Society of the Pacific
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(1976). 52:are a heterogeneous set of stars with B 197: 251:The Astronomy and Astrophysics Review 7: 437:Astronomical Society of the Pacific 183:General Catalogue of Variable Stars 25: 557:"Be Star Spectra (BeSS) Database" 2079: 2069: 2068: 1: 1981:Timeline of stellar astronomy 545:Hot and Active Stars Research 72:Definition and classification 549:Article from Olivier Thizy: 1641:Hertzsprung–Russell diagram 179:Gamma Cassiopeiae variables 27:In astronomy, a B-type star 2133: 1555:Kelvin–Helmholtz mechanism 543:Philippe Stee's homepage: 169:Gamma Cassiopeiae variable 166: 151: 29: 2064: 818: 605: 520:10.1007/978-94-010-1498-4 316:Astronomische Nachrichten 281:10.1007/s00159-013-0069-0 1934:With multiple exoplanets 336:10.1002/asna.18670680405 187:Lambda Eridani variables 30:Not to be confused with 720:Asymptotic giant branch 273:2013A&ARv..21...69R 173:Lambda Eridani variable 107:stars, but a number of 45:, the brightest Be star 2056:Tidal disruption event 1545:Circumstellar envelope 779:Luminous blue variable 46: 1581:Effective temperature 474:Astrophysical Journal 396:Astrophysical Journal 355:Astrophysical Journal 66:Balmer emission lines 40: 2051:Planet-hosting stars 1929:With resolved images 1900:Historical brightest 1830:Photometric-standard 1756:Solar radio emission 1550:Eddington luminosity 1330:Triple-alpha process 1268:Thorne–Żytkow object 643:Young stellar object 207:"Classical Be Stars" 84:, mass-transferring 1875:Highest temperature 1646:Color–color diagram 1511:Protoplanetary disk 1315:Proton–proton chain 993:Chemically peculiar 486:1931ApJ....73...94S 449:1975PASP...87..777M 408:1976ApJ...203L..87S 367:1925ApJ....61..389M 328:1866AN.....68...63S 310:Secchi, A. (1867). 223:2003PASP..115.1153P 127:, observed 1866 by 115:are also included. 1880:Lowest temperature 1631:Photometric system 1601:Absolute magnitude 1535:Circumstellar dust 1148:Stellar black hole 784:Stellar population 670:Herbig–Haro object 512:Be and Shell Stars 431:Massa, D. (1975). 82:Herbig Ae/Be stars 58:classical Be stars 47: 2094: 2093: 1997:Substellar object 1976:Planetary nebulae 1395:Luminous red nova 1305:Deuterium burning 1291: 1290: 774:Instability strip 754:Wolf-Rayet nebula 708:Horizontal branch 653:Pre-main-sequence 529:978-94-010-1498-4 125:Gamma Cassiopeiae 16:(Redirected from 2124: 2086:Stars portal 2084: 2083: 2072: 2071: 1728:Planetary system 1651:Strömgren sphere 1523:Asteroseismology 1244:Black hole star 816: 742:Planetary nebula 703:Red-giant branch 592: 585: 578: 569: 564: 533: 498: 497: 469: 463: 462: 460: 428: 422: 421: 419: 387: 381: 380: 378: 346: 340: 339: 307: 301: 300: 266: 246: 237: 236: 234: 202: 21: 2132: 2131: 2127: 2126: 2125: 2123: 2122: 2121: 2117:1866 in science 2097: 2096: 2095: 2090: 2078: 2060: 1985: 1954:Milky Way novae 1890:Smallest volume 1834: 1815:Radial velocity 1738: 1732: 1684:Common envelope 1660: 1559: 1528:Helioseismology 1499:Bipolar outflow 1440:Microturbulence 1435:Convection zone 1416: 1310:Lithium 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index 1611:Metallicity 1571:Designation 1540:Cosmic dust 1462:Photosphere 1228:Dark-energy 1203:Electroweak 1188:Black dwarf 1119:Radio-quiet 1102:White dwarf 988:White dwarf 638:Bok globule 163:Variability 148:Shell stars 113:giant stars 101:shell stars 78:supergiants 60:, is a non- 2107:Star types 2101:Categories 1964:Candidates 1959:Supernovae 1944:Red dwarfs 1803:Extinction 1591:Kinematics 1586:Luminosity 1564:Properties 1457:Atmosphere 1355:Si burning 1345:Ne burning 1283:White hole 1256:Quasi-star 1183:Blue dwarf 1038:Technetium 954:Hypergiant 932:Supergiant 193:References 154:Shell star 62:supergiant 1895:Brightest 1793:Magnitude 1773:Pole star 1694:Symbiotic 1689:Eclipsing 1621:Starlight 1422:Structure 1412:Supernova 1405:Micronova 1400:Recurrent 1385:Symbiotic 1370:p-process 1365:r-process 1360:s-process 1350:O burning 1340:C burning 1320:CNO cycle 1263:Gravastar 799:Hypernova 789:Supernova 764:Dredge-up 737:Blue loop 730:super-AGB 713:Red clump 690:Evolution 648:Protostar 628:Accretion 620:Formation 297:118652497 289:0935-4956 264:1310.3962 257:(1): 69. 119:Discovery 109:subgiants 2112:Be stars 2074:Category 1969:Remnants 1865:Extremes 1825:Parallax 1798:Apparent 1788:Asterism 1766:Sunlight 1716:Globular 1701:Multiple 1626:Variable 1616:Rotation 1576:Dynamics 1467:Starspot 1141:Magnetar 1084:Remnants 900:Subgiant 873:Subdwarf 725:post-AGB 551:Be Stars 133:Achernar 50:Be stars 43:Achernar 2041:Gravity 1990:Related 1910:Nearest 1858:Chinese 1706:Cluster 1679:Contact 1516:Proplyd 1390:Remnant 1278:Blitzar 1252:Hawking 1208:Strange 1158:Burster 1114:Neutron 1067:Extreme 1018:He-weak 663:T Tauri 482:Bibcode 445:Bibcode 443:: 777. 404:Bibcode 402:: L87. 363:Bibcode 361:: 389. 324:Bibcode 269:Bibcode 219:Bibcode 90:B stars 2031:Galaxy 2019:Planet 2007:Desert 1915:bright 1853:Arabic 1674:Binary 1494:Bubble 1218:Planck 1193:Exotic 1129:Binary 1124:Pulsar 1062:Helium 1023:Barium 966:Carbon 959:Yellow 947:Yellow 920:Yellow 759:PG1159 526:  480:: 94. 295:  287:  88:, and 32:B star 2036:Guest 1840:Lists 1721:Super 1375:Fusor 1248:Black 1233:Quark 1213:Preon 1198:Boson 1134:X-ray 1050:Shell 1003:Ap/Bp 905:Giant 823:Early 769:OH/IR 599:Stars 293:S2CID 259:arXiv 139:Model 1711:Open 1606:Mass 1430:Core 1380:Nova 1273:Iron 1223:Dark 1033:Lead 1013:HgMn 1008:CEMP 937:Blue 910:Blue 828:Late 610:List 524:ISBN 285:ISSN 171:and 111:and 2012:Sub 1746:Sun 1165:SGR 942:Red 915:Red 516:doi 490:doi 453:doi 412:doi 400:203 371:doi 332:doi 277:doi 227:doi 215:115 2103:: 1045:Be 998:Am 981:CH 976:CN 895:OB 890:WR 559:. 522:. 514:. 488:. 478:73 476:. 451:. 441:87 439:. 435:. 410:. 398:. 394:. 369:. 359:61 357:. 353:. 330:. 320:68 318:. 314:. 291:. 283:. 275:. 267:. 255:21 253:. 241:^ 225:. 213:. 209:. 189:. 80:, 68:. 1238:Q 1057:B 971:S 883:B 878:O 866:M 861:K 856:G 851:F 846:A 841:B 836:O 591:e 584:t 577:v 563:. 532:. 518:: 496:. 492:: 484:: 461:. 455:: 447:: 420:. 414:: 406:: 379:. 373:: 365:: 338:. 334:: 326:: 299:. 279:: 271:: 261:: 235:. 229:: 221:: 34:. 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Index

Decretion disk
B star

Achernar
spectral types
supergiant
Balmer emission lines
supergiants
Herbig Ae/Be stars
binary systems
B stars
Balmer series
shell stars
main sequence
subgiants
giant stars
Gamma Cassiopeiae
Angelo Secchi
Achernar
Shell star
Gamma Cassiopeiae variable
Lambda Eridani variable
Gamma Cassiopeiae variables
General Catalogue of Variable Stars
Lambda Eridani variables
"Classical Be Stars"
Bibcode
2003PASP..115.1153P
doi
10.1086/378307

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