Beta1 Sagittarii
Observation data Epoch J2000.0 Equinox J2000.0 (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] |
Astrometry | |
Radial velocity (Rv) | −10.7±2.7[5] km/s |
Proper motion ( | RA: +13.67[1] mas/yr Dec.: −19.03[1] mas/yr |
Parallax ( | 10.40 ± 1.14 mas[1] |
Distance | approx. 310 ly (approx. 100 pc) |
Absolute magnitude (MV) | −1.32[6] |
Details | |
Mass | 3.67±0.14[7] M☉ |
Radius | 2.73[4] R☉ |
Luminosity | 324[7] L☉ |
Surface gravity (log g) | 3.83[8] cgs |
Temperature | 11,960[8] K |
Metallicity [Fe/H] | −0.35[8] dex |
Rotational velocity (v sin i) | 85±13[4] km/s |
Age | 224[9] Myr |
Radius | 1.89[4] R☉ |
Rotational velocity (v sin i) | 140±21[4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Beta1 Sagittarii, Latinized from
The pair of stars that constitute this system have an angular separation of 28.3[11] arc seconds, with an estimated physical separation of about 3,290
The companion, Beta1 Sagittarii B, is a magnitude 7.4[11] A-type main sequence star with a class of A5 V.[3] It has 1.89[4] times the radius of the Sun and may be spinning faster than the primary with a projected rotational velocity of 140 km/s.[4]
Nomenclature
[edit]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,
References
[edit]- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
- ^ a b c Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics, 19: 91, Bibcode:1975A&AS...19...91L.
- ^ a b c d e f g h i j k Howe, K. S.; Clarke, C. J. (January 2009), "An analysis of v sin (i) correlations in early-type binaries", Monthly Notices of the Royal Astronomical Society, 392 (1): 448–454, Bibcode:2009MNRAS.392..448H, doi:10.1111/j.1365-2966.2008.14073.x.
- ^ Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ 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, S2CID 119257644.
- ^ a b c d e Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b c d Hempel, M.; Holweger, H. (September 2003), "Abundance analysis of late B stars. Evidence for diffusion and against weak stellar winds", Astronomy and Astrophysics, 408: 1065–1076, Bibcode:2003A&A...408.1065H, doi:10.1051/0004-6361:20030889.
- ^ a b c Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ "bet01 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-07.
- ^ a b c 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.
- ^ Kunitzsch, Paul; Smart, Tim (2006), A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.), Cambridge, Massachusetts: Sky Pub, ISBN 978-1-931559-44-7.
- ^ a b Naming Stars, IAU.org, retrieved 16 December 2017.
- ^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
- ^ "I
AU Working Group on Star Names (WGSN)". Retrieved 22 May 2016. - ^ "Bulletin of the I
AU Working Group on Star Names, No. 2" (PDF). Retrieved 16 December 2017. - ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy)
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