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    Gamma Piscis Austrini

    Topic: Astronomy

     From Handwiki - Reading time: 3 min
    Short description: Star in the constellation Piscis Austrinus
    Gamma Piscis Austrini
    Piscis Austrinus IAU.svg
    Red circle.svg
    Location of γ Piscis Austrini (circled)
    Observation data
    Equinox J2000.0]] (ICRS)
    Constellation Piscis Austrinus
    Right ascension  22h 52m 31.52285s[1]
    Declination −32° 52′ 31.7041″[1]
    Apparent magnitude (V) +4.448[2] (4.59 + 8.20)[3]
    Characteristics
    γ PsA A
    Spectral type A0 Vp(SrCrEu)[4]
    U−B color index −0.038[2]
    B−V color index −0.046[2]
    γ PsA B
    Spectral type F5 V[5]
    U−B color index −0.08[5]
    B−V color index +0.44[5]
    Astrometry
    Radial velocity (Rv)16.5±2.7[6] km/s
    Proper motion (μ) RA: −25.039[1] mas/yr
    Dec.: −30.933[1] mas/yr
    Parallax (π)16.0365 ± 0.4505[1] mas
    Distance203 ± 6 ly
    (62 ± 2 pc)
    Absolute magnitude (MV)−0.20/3.50[5]
    Details[7]
    γ PsA A
    Mass2.63 M☉
    Surface gravity (log g)3.92 cgs
    Temperature10,776±366 K
    Rotational velocity (v sin i)47 km/s
    Age214 Myr
    Other designations
    γ PsA, 22 Piscis Austrini, CD−33° 16270, HD 216336, HIP 112948, HR 8695, SAO 214153, WDS J22525-3253AB[8]
    Database references
    SIMBADγ PsA
    γ PsA A
    γ PsA B

    Gamma Piscis Austrini, Latinized from γ Piscis Austrini, is binary star[3] system in the southern constellation of Piscis Austrinus. It is visible to the naked eye with a combined apparent visual magnitude of +4.448.[2] As of 2010, the pair had an angular separation of 4 arc seconds along a position angle of 255°.[9] Based upon an annual parallax shift of 16.0 mas as seen from the Earth,[1] the system is located about 203 light years from the Sun.

    The magnitude 4.59[3] primary, component A, is a white-hued, chemically peculiar A-type main sequence star with a stellar classification of A0 Vp(SrCrEu).[4] It is an estimated 214 million years old with 2.63 times the mass of the Sun. The fainter magnitude 8.20[3] companion, component B, is an F-type main sequence star with a class of F5 V.[5]

    Gamma Piscis Austrini is moving through the Galaxy at a speed of 24.1 km/s relative to the Sun. Its projected Galactic orbit carries it between 21,605 and 30,903 light-years from the center of the Galaxy. It came closest to the Sun 1.8 million years ago at a distance of 157 light-years.[10]

    Naming

    In Chinese, 敗臼 (Bài Jiù), meaning Decayed Mortar, refers to an asterism consisting of refers to an asterism consisting of γ Piscis Austrini, γ Gruis, λ Gruis and 19 Piscis Austrini. Consequently, the Chinese name for γ Piscis Austrini itself is 敗臼三 (Bài Jiù sān, English: the Third Star of Decayed Mortar.)[11]

    References

    1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
    2. ↑ 2.0 2.1 2.2 2.3 Rakos, K. D. et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series 47: 221–235, Bibcode: 1982A&AS...47..221R. 
    3. ↑ 3.0 3.1 3.2 3.3 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
    4. ↑ 4.0 4.1 Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement 99: 135, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A. 
    5. ↑ 5.0 5.1 5.2 5.3 5.4 Corbally, C. J. (1984), "Close visual binaries. I - MK classifications", Astrophysical Journal Supplement Series 55: 657, doi:10.1086/190973, Bibcode: 1984ApJS...55..657C. 
    6. ↑ Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
    7. ↑ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
    8. ↑ "gam PsA -- Double or multiple star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=gam+PsA, retrieved 2017-05-18. 
    9. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 
    10. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
    11. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 5 日

    External links



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