Beta Crateris

Beta Crateris
Location of β Crateris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crater[1]
Right ascension 11h 11m 39.479s[2]
Declination −22° 49′ 33.053″[2]
Apparent magnitude (V) 4.46[1] (4.61 + 13.40)[3]
Characteristics
Spectral type A2 III[3] + DA1.4[3]
U−B color index +0.05[4]
B−V color index +0.025±0.004[1]
Astrometry
Radial velocity (Rv)+5.6±0.5[5] km/s
Proper motion (μ) RA: +7.827 mas/yr[2]
Dec.: −102.911 mas/yr[2]
Parallax (π)10.3043±0.1166 mas[2]
Distance317 ± 4 ly
(97 ± 1 pc)
Absolute magnitude (MV)−0.62[1] + 8.19[3]
Details
Luminosity147[6] L☉
Surface gravity (log g)3.5[7] cgs
Temperature8,830[6] K
Rotational velocity (v sin i)49[8] km/s
β Crt B
Mass0.43[9] M☉
Radius0.027[10] R☉
Surface gravity (log g)7.40[10] cgs
Temperature36,885[10] K
Other designations
β Crt, 11 Crateris, BD−22° 3095, FK5 421, GC 15385, HD 97277, HIP 54682, HR 4343, SAO 179624, WD 1109-225[11]
Database references
SIMBADdata

Beta Crateris is a binary star[3] system in the southern constellation of Crater. Its name is a Bayer designation that is Latinized from β Crateris and abbreviated Beta Crt or β Crt. This system visible to the naked eye as a point of light with an apparent visual magnitude of 4.46.[4] Based upon an annual parallax shift of 10.30 mas as seen from Earth, it is located at a distance of approximately 317 light-years (97 pc) from the Sun.

Properties

This is an astrometric binary[12] 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][12][9] However, Houk and Smith-Moore (1988) give a main sequence classification of A1 V,[13] while Abt and Morrell (1995) list it as a subgiant star with a class of A2 IV.[14] The spectrum shows enhanced barium, possibly as a result of a previous mass transfer event.[7]

The companion, component B, is a white dwarf[9] of class DA with an effective temperature of 36,885 K that has been cooling down for around four million years.[10] 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 a highly eccentric orbit, resulting in grazing interactions.[3] The dwarf is a source of X-ray emission.[15]

Name

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

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Sharāsīf were the titles for two stars: β Crateris as Al Sharasīf II and κ Hydrae as Al Sharasīf I.[19]

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.[20] Consequently, β Crateris itself is known as 翼宿十六 (Yì Sù shíliù, English: the Sixteenth Star of Wings.)[21][22]

References

  1. 1 2 3 4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 7 8 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.
  4. 1 2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  5. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  7. 1 2 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.
  8. ↑ Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  9. 1 2 3 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.
  10. 1 2 3 4 Barstow, M. A.; et al. (May 2014), "Evidence for an external origin of heavy elements in hot DA white dwarfs", Monthly Notices of the Royal Astronomical Society, 440 (2): 1607–1625, arXiv:1402.2164, Bibcode:2014MNRAS.440.1607B, doi:10.1093/mnras/stu216.
  11. ↑ "bet Crt", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-03-02.
  12. 1 2 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  13. ↑ 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.
  14. ↑ 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.
  15. ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
  16. ↑ Turkmani, Rim (July 7, 2011), "Arabic Roots of the Scientific Revolution", Muslim Heritage, retrieved 1 July 2016.
  17. ↑ Allen, Richard Hinckley (1963), "Crater, the Cup", Star Names, Their Lore and Meaning (Dover ed.), p. 182, retrieved 2026-08-04.
  18. ↑ Allen, Richard Hinckley (1963), "Hydra, the Water-snake", Star Names, Their Lore and Meaning (Dover ed.), p. 182, retrieved 2026-08-04.
  19. ↑ Rhoads, Jack W. (November 15, 1971), A Reduced Star Catalog Containing 537 Named Stars, Technical Memorandum 33-507, Jet Propulsion Laboratory, California Institute of Technology, retrieved 2026-08-04.
  20. ↑ (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.
  21. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 31 日 Archived 2011-05-22 at the Wayback Machine
  22. ↑ (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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