| appmag_v = 4.46[3] {{nowrap|(4.61 + 13.40)}}[4]
}}{{Starbox character
| class = A2 III[4] + DA1.4[4]
| b-v = +0.02[3]
| u-b = +0.05[3]
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|+5.6|0.5}}[9]
| prop_mo_ra = + 5.220 ± 0.546[10]
| prop_mo_dec = −103.457 ± 0.483[10]
| parallax = 11.0358
| p_error =0.2918
| parallax_footnote = [1]
| absmag_v = −0.62[13] + 8.19[4]
}}{{Starbox detail
| source =
| mass =
| radius =
| luminosity = 147[15]
| temperature = 8,830[15]
| gravity = 3.5[17]
| metal_fe =
| rotational_velocity = 49[18]
| age_myr =
| component2 = β Crt B
| mass2 = 0.43[19]
| radius2 = 0.027[4]
| temperature2 = 36,885[21]
| gravity2 = 7.40[21]
}}{{Starbox catalog
| names = β Crt, 11 Crateris, BD−22° 3095, FK5 421, HD 97277, HIP 54682, HR 4343, SAO 179624, WD 1109-225.[23]
}}{{Starbox reference
| Simbad = bet+Crt
}}{{Starbox end}}Beta Crateris, Latinized from β Crateris, is a binary star[4] system in the southern constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.46.[3] Based upon an annual parallax shift of 9.59 mas as seen from Earth, it is located around 340 light years from the Sun.
This is an astrometric binary[26] 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.[4] The primary, component A, is listed as an A-type giant star with a stellar classification of A2 III.[4][26][19] However, Houk and Smith-Moore (1988) give a main sequence classification of A1 V,[31] while Abt and Morrell (1995) list it as a subgiant star with a class of A2 IV.[32] The spectrum shows enhanced barium, possibly as a result of a previous mass transfer event.[17]
The companion, component B, is a white dwarf[19] of class DA with an effective temperature of 36,885 K that has been cooling down for around four million years.[21] 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.[4] The dwarf is a source of X-ray emission.[37]
Name
This star was one of the set assigned by the 16th century astronomer Al Tizini[2] to Al Sharāsīf (ألشراسيف), the Ribs (of Hydra), which included the stars from β Crateris westward through κ Hydrae.[3][4]
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.[5]
In Chinese, {{lang|zh|翼宿}} ({{lang|zh-Latn|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.[6] Consequently, β Crateris itself is known as {{lang|zh|翼宿十六}} ({{lang|zh-Latn|Yì Sù shíliù}}, {{lang-en|the Sixteenth Star of Wings}}.)[7][8]
References
1. ^1 2 {{cite DR2|3537996837843690496}}
2. ^{{cite web | url=http://www.muslimheritage.com/article/arabic-roots-scientific-revolution | author=Rim Turkmani | title=Arabic Roots of the Scientific Revolution | website=Muslim Heritage | access-date=1 July 2016}}
3. ^Star Names - R.H.Allen p. 182
4. ^Star Names - R.H.Allen p. 246
5. ^{{citation | url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf | first1=Jack W. | last1=Rhoads | title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars | publisher=Jet Propulsion Laboratory, California Institute of Technology | date=November 15, 1971 | postscript=. }}
6. ^{{zh icon}} 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}}.
7. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 31 日
8. ^{{zh icon}} [https://web.archive.org/web/20110902003808/http://wbbs.cc.ncku.edu.tw/ccns/index.php/8/179/485635 夢之大地 @ 國立成功大學 WebBBS DreamLand @ National Cheng Kung University WebBBS System]
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