Β_Crateris

Beta Crateris

Beta Crateris

Binary star system in the constellation Crater

Beta Crateris, Latinized from β Crateris, is a binary star[3] system in the southern constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.46.[2] Based upon an annual parallax shift of 9.59 mas as seen from Earth, it is located around 340 light years from the Sun.

Quick Facts Constellation, Right ascension ...

This is an astrometric binary[13] star system with an orbital period of 6.0 years and a projected separation of 8.3 AU. The orbit has an estimated semimajor axis of 9.3 AU.[3] The primary, component A, is listed as an A-type giant star with a stellar classification of A2 III.[3][13][10] However, Houk and Smith-Moore (1988) give a main sequence classification of A1 V,[14] while Abt and Morrell (1995) list it as a subgiant star with a class of A2 IV.[15] The spectrum shows enhanced barium, possibly as a result of a previous mass transfer event.[8]

The companion, component B, is a white dwarf[10] of class DA with an effective temperature of 36,885 K that has been cooling down for around four million years.[11] It has an unusually low mass, 43% that of the Sun, suggesting that the white dwarf progenitor may have transferred matter to its companion. Alternative scenarios require either the evolution of a triple star system, or a binary system with highly eccentric orbit resulting in grazing interactions.[3] The dwarf is a source of X-ray emission.[16]

Name

This star was one of the set assigned by the 16th century astronomer Al Tizini[17] to Al Sharāsīf (ألشراسيف), the Ribs (of Hydra), which included the stars from β Crateris westward through κ Hydrae.[18][19]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Sharāsīf were the title for two stars : β Crateris as Al Sharasīf II and κ Hydrae as Al Sharasīf I.[20]

In Chinese, 翼宿 (Yì Sù), meaning Wings (asterism), refers to an asterism consisting of β Crateris, α Crateris, γ Crateris, ζ Crateris, λ Crateris, ν Hydrae, η Crateris, δ Crateris, ι Crateris, κ Crateris, ε Crateris, HD 95808, HD 93833, θ Crateris, HD 102574, HD 100219, HD 99922, HD 100307, HD 96819, χ1 Hydrae, HD 102620 and HD 103462.[21] Consequently, β Crateris itself is known as 翼宿十六 (Yì Sù shíliù, English: the Sixteenth Star of Wings.)[22][23]

References

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    van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
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    Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
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    Holberg, J. B.; et al. (2013), "Where are all the Sirius-like binary systems?", Monthly Notices of the Royal Astronomical Society, 435 (3): 2077, arXiv:1307.8047, Bibcode:2013MNRAS.435.2077H, doi:10.1093/mnras/stt1433.
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    Smalley, B.; et al. (January 1997), "The chemical composition and binarity of beta Crateris", Monthly Notices of the Royal Astronomical Society, 284 (2): 457–464, Bibcode:1997MNRAS.284..457S, doi:10.1093/mnras/284.2.457.
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    Burleigh, M. R.; et al. (November 2001), "The low-mass white dwarf companion to β Crateris", Monthly Notices of the Royal Astronomical Society, 327 (4): 1158–1164, arXiv:astro-ph/0106463, Bibcode:2001MNRAS.327.1158B, doi:10.1046/j.1365-8711.2001.04818.x, S2CID 9031525.
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    "bet Crt". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-02.{{cite web}}: CS1 maint: postscript (link)
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    Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
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    Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
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    Star Names - R.H.Allen p. 182
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    Star Names - R.H.Allen p. 246
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    (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
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    (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 31 日
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    (in Chinese) 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System
  • Kaler, James B. (May 22, 2015), "Beta Crateris", Stars, University of Illinois, retrieved 2017-03-03.
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