Beta Crateris

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β Crateris
Location of β Crateris (circled)
Observation data
ICRS
)
Constellation Crater
Right ascension 11h 11m 39.48783s[1]
Declination −22° 49′ 33.0593″[1]
Apparent magnitude (V) 4.46[2] (4.61 + 13.40)[3]
Characteristics
Spectral type A2 III[3] + DA1.4[3]
U−B color index +0.05[2]
B−V color index +0.02[2]
Distance
296 ± 8 ly
(91 ± 2 pc)
Absolute magnitude (MV)−0.62[6] + 8.19[3]
Details
Rotational velocity (v sin i)
49[9] km/s
β Crt B
Mass0.43[10] M☉
Radius0.027[3] R☉
Surface gravity (log g)7.40[11] cgs
Temperature36,885[11] K
HR 4343, SAO 179624, WD 1109-225.[12]
Database references
SIMBADdata

Beta Crateris,

light years from the Sun
.

This is an

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

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:1986EgUBV........0M
    .
  3. ^
    doi:10.1093/mnras/stt1433
    .
  4. S2CID 59451347
    , A61.
  5. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  6. S2CID 119257644
    .
  7. ^
    S2CID 118665352
    .
  8. ^
    doi:10.1093/mnras/284.2.457
    .
  9. S2CID 18475298
    .
  10. ^
    S2CID 9031525
    .
  11. ^
    doi:10.1093/mnras/stu216
    .
  12. ^ "bet Crt". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-02.{{cite web}}: CS1 maint: postscript (link)
  13. ^
    S2CID 14878976
    .
  14. Bibcode:1988mcts.book.....H
    .
  15. doi:10.1086/192182
    .
  16. doi:10.1051/0004-6361:20077429
    .
  17. ^ Rim Turkmani (7 July 2011). "Arabic Roots of the Scientific Revolution". Muslim Heritage. Retrieved 1 July 2016.
  18. ^ Star Names - R.H.Allen p. 182
  19. ^ Star Names - R.H.Allen p. 246
  20. ^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology.
  21. ISBN 978-986-7332-25-7
    .
  22. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 31 日
  23. ^ (in Chinese) 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System

External links

  • Kaler, James B. (May 22, 2015), "Beta Crateris", Stars, University of Illinois, retrieved 2017-03-03.
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