Astronomy:58 Aquarii

From HandWiki
Short description: White-hued star in the constellation Aquarius
58 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  22h 31m 41.31672s[1]
Declination −10° 54′ 19.8148″[1]
Apparent magnitude (V) 6.39[2]
Characteristics
Spectral type A9/F0 V[3] or A8 III[4]
B−V color index 0.290±0.009[2]
Astrometry
Radial velocity (Rv)+4.0±4.3[5] km/s
Proper motion (μ) RA: +77.347[1] mas/yr
Dec.: −52.472[1] mas/yr
Parallax (π)13.4137 ± 0.1535[1] mas
Distance243 ± 3 ly
(74.6 ± 0.9 pc)
Absolute magnitude (MV)2.12[2]
Details[6]
Mass1.734±0.107 M☉
Radius2.059+0.305
−0.164 R☉
Luminosity11.73[2] L☉
Surface gravity (log g)4.040+0.065
−0.104 cgs
Temperature7,477+377
−528 K
Metallicity [Fe/H]0.014+0.150
−0.120 dex
Rotational velocity (v sin i)30.0±10.0[7] km/s
Age1.086[8] Gyr
Other designations
CD−11° 5855, GC 31468, HD 213464, HIP 111200, HR 8583, SAO 165147[9]
Database references
SIMBADdata

58 Aquarii, abbreviated 58 Aqr, is a star in the constellation of Aquarius. 58 Aquarii is its Flamsteed designation. It is a sixth magnitude star with an apparent visual magnitude of 6.39,[2] which means it is a challenge to view with the naked eye. Based upon an annual parallax shift of 13.4 mas,[1] it is located 243 light years from the Sun. This has been identified as a visual binary system with an orbital period of 829.976 days (2.27 years)[10] in a circular orbit (eccentricity of zero).[11]

The primary component has a stellar classification of A9/F0 V,[3] matching a main sequence star with a spectrum showing mixed traits of an A/F-type. (Cowley and Fraquelli [1974] has previously assigned it a giant star class of A8 III.)[4] It is a chemically peculiar Am star, showing metallic lines with no magnetic field.[7] The star has 1.7 times the mass of the Sun and 2.1 times the Sun's radius. It is radiating 12 times the Sun's luminosity from its photosphere at an effective temperature of 7,477 K.[6]

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. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey 5, Bibcode: 1999MSS...C05....0H. 
  4. ↑ 4.0 4.1 Cowley, A.; Fraquelli, D. (1974), "MK Spectral Types for Some Bright F Stars", Publications of the Astronomical Society of the Pacific 86 (509): 70, doi:10.1086/129562, Bibcode: 1974PASP...86...70C. 
  5. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 Huber, Daniel et al. (2016), "The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8", The Astrophysical Journal Supplement Series 224 (1): 2, doi:10.3847/0067-0049/224/1/2, Bibcode: 2016ApJS..224....2H. 
  7. ↑ 7.0 7.1 Paunzen, E. et al. (February 2013), "A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society 429 (1): 119–125, doi:10.1093/mnras/sts318, Bibcode: 2013MNRAS.429..119P. 
  8. ↑ 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. 
  9. ↑ "58 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=58+Aqr. 
  10. ↑ Abt, Helmut A.; Boonyarak, Chayan (November 2004), "Tidal Effects in Binaries of Various Periods", The Astrophysical Journal 616 (1): 562–566, doi:10.1086/423795, Bibcode: 2004ApJ...616..562A. 
  11. ↑ Abt, Helmut A. (August 2005), "Observed Orbital Eccentricities", The Astrophysical Journal 629 (1): 507–511, doi:10.1086/431207, Bibcode: 2005ApJ...629..507A. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:58_Aquarii&oldid=3429010"