Beta1 Sagittarii

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For other stars with this Bayer designation, see β Sagittarii.
Beta1 Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings
Location of β1 Sagittarii (circled)
Observation data
ICRS
)
Constellation Sagittarius
Right ascension 19h 22m 38.29770s[1]
Declination −44° 27′ 32.2458″[1]
Apparent magnitude (V) +4.01[2]
Characteristics
Spectral type B9 V + A5 V[3][4]
U−B color index −0.39[2]
B−V color index −0.10[2]
Distance
approx. 310 ly
(approx. 100 pc)
Absolute magnitude (MV)−1.32[6]
Details
β1 Sgr A
Rotational velocity (v sin i)
140±21[4] km/s
HR 7337, SAO 229646, WDS J19226-4428A[10]
Database references
SIMBADdata

Beta1 Sagittarii,

interstellar dust.[9]

The pair of stars that constitute this system have an

luminosity of the Sun from its photosphere at an effective temperature of 11,960 K.[8]

The companion, Beta1 Sagittarii B, is a magnitude 7.4

radius of the Sun and may be spinning faster than the primary with a projected rotational velocity of 140 km/s.[4]

Nomenclature

β1 Sagittarii (Latinised to Beta1 Sagittarii) is the system's Bayer designation. The designations of the two components as Beta1 Sagittarii 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).[14]

In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Arkab Prior for Beta1 Sagittarii on 5 October 2016 and it is now so included in the List of IAU-approved Star Names.[13] For such names relating to members of multiple star systems, and where a component letter (from e.g. Washington Double Star Catalog) is not explicitly listed, the WGSN says that the name should be understood to be attributed to the brightest component by visual brightness.[16]

In

Chinese name for Beta1 Sagittarii itself is 天淵二 (Tiān Yuān èr, English: the Second Star of Celestial Spring.)[17]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:1978A&AS...34....1N
    .
  3. ^
    Bibcode:1975A&AS...19...91L
    .
  4. ^
    doi:10.1111/j.1365-2966.2008.14073.x
    .
  5. S2CID 119231169
    .
  6. S2CID 119257644
    .
  7. ^
    S2CID 55586789
    .
  8. ^
    doi:10.1051/0004-6361:20030889
    .
  9. ^
    S2CID 119108982
    .
  10. ^ "bet01 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-07.
  11. ^
    S2CID 14878976
    .
  12. ISBN 978-1-931559-44-7
    .
  13. ^ a b Naming Stars, IAU.org, retrieved 16 December 2017.
  14. arXiv:1012.0707 [astro-ph.SR
    ].
  15. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  16. ^ "Bulletin of the IAU Working Group on Star Names, No. 2" (PDF). Retrieved 16 December 2017.
  17. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 2 日
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