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词条 Alpha Comae Berenices
释义

  1. Nomenclature

  2. Properties

  3. References

  4. External links

{{Starbox begin
| name = α Comae Berenices}}{{Starbox image
| image =
| caption = Coma Berenices constellation}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Coma Berenices
| ra = {{RA|13|09|59.285}}[1]
| dec = {{DEC|+17|31|46.04}}[1]
| appmag_v=4.29 to 4.35
(combined)[1]
A: 4.85 / B: 5.53[4]
}}{{Starbox character
| class = A: F5V / B: F5V
(binary star)[2]
| u-b = −0.06[3]
| b-v = 0.45[3]
| v-r = 0.2[8]
| r-i = 0.2[8]
}}{{Starbox astrometry
| radial_v = {{val|−17.7|0.9}}[8]
| prop_mo_ra = {{val|−433.13|0.70}}[1]
| prop_mo_dec = {{val|141.24|0.51}}[1]
| parallax = 56.10
| p_error = 0.89
| parallax_footnote = [1]
| absmag_v= 3.82[14]
}}{{Starbox orbit
| reference =
| period = {{val|25.8696|0.008219}}
| axis = {{val|0.67144|0.00033}}
| periastron = {{val|57056.84|0.36}}
| inclination = {{val|90.0501|0.0062}}
| node = {{val|12.2272|0.0098}}
| eccentricity = {{val|0.51060|0.00061}}
| periarg = {{val|100.563|0.026}}
}}{{Starbox detail
| component1 = A
| mass = 1.237[16]
| luminosity = 1.72[17]
| temperature = 6,365[18]
| metal_fe = {{val|-0.23}}[18]
| gravity = 4.19[18]
| component2 = B
| mass2 = 1.087[16]
| temperature2 = 6,378[17]
| luminosity2 = 1.75[17]
}}{{Starbox catalog
| names=α Com, Alpha Comae Berenices, Alpha Com, 42 Comae Berenices, 42 Com, STF 1728, ADS 8804 , BD+18 2697, CCDM J13100+1732, GC 17833, Gliese 501, HIP 64241, IDS 13051+1803 AB, LTT 13802, NLTT 33105, PPM 129630, SAO 100443, WDS 13100+1732.[8][4][5]
| component1 = A
| names1=HD 114378, HR 4968
| component2 = B
| names2=HD 114379, HR 4969
}}{{Starbox reference
| Simbad=alf+com}}{{Starbox end}}

Alpha Comae Berenices (α Comae Berenices, abbreviated Alpha Com, α Com) is a binary star in the constellation of Coma Berenices (Berenice's Hair), {{convert|17.8|pc|ly}} away. It consists of two main sequence stars, each a little hotter and more luminous than the Sun.

Alpha Comae Berenices is said to represent the crown worn by Queen Berenice. The two components are designated Alpha Comae Berenices A (also named Diadem[6]) and B.

Nomenclature

α Comae Berenices (Latinised to Alpha Comae Berenices) is the system's Bayer designation. The designations of the two components as Alpha Comae Berenices A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[7]

The system bore the traditional names Diadem and Al Dafirah, the latter derived from the Arabic الضفيرة ađ̧-đ̧afīrah "the braid".{{cn|date=January 2018}} In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[8] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[9] It approved the name Diadem for the component Alpha Comae Berenices A on 1 February 2017 and it is now so included in the List of IAU-approved Star Names.[6]

In Chinese, {{lang|zh|太微左垣}} ({{lang|zh-Latn|Tài Wēi Zuǒ Yuán}}), meaning Left Wall of Supreme Palace Enclosure, refers to an asterism consisting of Alpha Comae Berenices, Eta Virginis, Gamma Virginis, Delta Virginis and Epsilon Virginis.[10] Consequently, Alpha Comae Berenices itself is known as {{lang|zh|太微左垣五}} ({{lang|zh-Latn|Tài Wēi Zuǒ Yuán wǔ}}, {{lang-en|the Fifth Star of Left Wall of Supreme Palace Enclosure}}.),[11] representing {{lang|zh|東上將}} ({{lang|zh-Latn|Dōngshǎngjiāng}}), meaning The First Eastern General.[12] 東上將 (Dōngshǎngjiāng), westernized into Shang Tseang, but that name was designated for "v Comae Berenices" by R.H. Allen and the meaning is "a Higher General".[13]

Properties

Although Alpha Comae Berenices bears the title "alpha", at magnitude 4.32 it is actually fainter than Beta Comae Berenices.

It is a binary star, with almost equal components of magnitudes 5.05 m and 5.08 m orbiting each other with a period of 25.87 years. The system, estimated to be 58 light-years distant, appears so nearly "edge-on" from the Earth that the two stars appear to move back-and-forth in a straight line with a maximum separation of only 0.7 arcsec. Eclipses are predicted to occur between the two components however they have not been successfully observed due to miscalculations of the time of eclipse.

The mean separation between them is approximately 10 AU, about the distance between the Sun and Saturn.

The binary star has a visual companion, CCDM J13100+1732C, of apparent magnitude 10.2, located 89 arcseconds away along a position angle of 345°.[14]

References

1. ^NSV 6116, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 3, 2008.
2. ^Diadem {{webarchive|url=https://web.archive.org/web/20080511204821/http://www.astro.uiuc.edu/~kaler/sow/diadem.html |date=2008-05-11 }}, Jim Kaler, Stars. Accessed on line September 3, 2008.
3. ^1 HR 4968, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 3, 2008.
4. ^{{SIMBAD link|HD+114378|HD 114378 -- Star in double system}}, database entry, SIMBAD, accessed on line September 3, 2008.
5. ^{{SIMBAD link|HD+114379|HD 114379 -- Star in double system}}, database entry, SIMBAD, accessed on line September 3, 2008.
6. ^1 {{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=16 December 2017}}
7. ^{{cite arXiv |title=On the naming convention used for multiple star systems and extrasolar planets |date=2010 |eprint=1012.0707 |class=astro-ph.SR |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. }}
8. ^{{Cite web|url=https://www.iau.org/science/scientific_bodies/working_groups/280/|title=International Astronomical Union {{!}} IAU|website=www.iau.org|access-date=2017-03-31}}
9. ^{{cite web | url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015-2018) - Star Names |accessdate=2018-07-14}}
10. ^{{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}}.
11. ^{{zh icon}} 香港太空館 - 研究資源 - 亮星中英對照表 {{webarchive|url=https://web.archive.org/web/20090929163750/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_c_d.htm |date=2009-09-29 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.
12. ^{{zh icon}} English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name {{webarchive|url=https://web.archive.org/web/20080924022136/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm |date=2008-09-24 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.
13. ^Richard Hinckley Allen: Star Names — Their Lore and Meaning: Coma Berenices
14. ^Entry 13100+1732, discoverer code STF1728, components AB-C, The Washington Double Star Catalog {{webarchive|url=https://web.archive.org/web/20080413021643/http://ad.usno.navy.mil/wds/wdsnewframe3.html |date=2008-04-13 }}, United States Naval Observatory. Accessed on line September 3, 2008.
15. ^1 {{citation | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation | last=Reiners | first=A. | journal=Astronomy and Astrophysics | volume=446 | issue=1 | pages=267–277 | date=January 2006 | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R | arxiv=astro-ph/0509399 | postscript=. }}
16. ^1 Entry 13100+1732,Sixth Catalog of Orbits of Visual Binary Stars,United States Naval Observatory. Accessed on line September 3, 2008.
17. ^1 2 3 4 {{SIMBAD link|alf+com|NSV 6116 -- Variable Star}}, database entry, SIMBAD. Accessed on line September 3, 2008.
18. ^1 2 3 4 5 {{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/abs/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }} Vizier catalog entry
19. ^1 2 {{cite journal|bibcode=2005SerAJ.170...73P|title=Orbits of Seven Edge-On Visual Double Stars|journal=Serbian Astronomical Journal|volume=170|pages=73|last1=Pavlovic|first1=R.|last2=Todorovic|first2=N.|year=2005}}
20. ^1 2 3 {{cite journal|bibcode=2000AJ....119.2403T|title=Binary Star Differential Photometry Using the Adaptive Optics System at Mount Wilson Observatory|journal=The Astronomical Journal|volume=119|issue=5|pages=2403|last1=Ten Brummelaar|first1=Theo|last2=Mason|first2=Brian D.|last3=McAlister|first3=Harold A.|last4=Roberts|first4=Lewis C.|last5=Turner|first5=Nils H.|last6=Hartkopf|first6=William I.|last7=Bagnuolo|first7=William G.|year=2000}}
21. ^1 2 3 {{cite journal|bibcode=2016A&A...591A.118S|title=The PASTEL catalogue: 2016 version|journal=Astronomy and Astrophysics|volume=591|pages=A118|last1=Soubiran|first1=Caroline|last2=Le Campion|first2=Jean-François|last3=Brouillet|first3=Nathalie|last4=Chemin|first4=Laurent|year=2016|doi=10.1051/0004-6361/201628497|arxiv=1605.07384}}
[15][16][17][18][19][20][21]
}}

External links

{{Stars of Coma Berenices}}

12 : Bayer objects|Binary stars|Coma Berenices (constellation)|F-type main-sequence stars|Stars with proper names|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|Triple stars|Durchmusterung objects|Gliese and GJ objects|HR objects
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