Sigma1 Gruis

Sigma1 Gruis, a Latinization of σ1 Gruis, is a star in the constellation Grus. It is a dim, white-hued star near the lower limit for visibility to the naked eye with an apparent visual magnitude of 6.26.[2] This object is located 229 light-years (70.1 pc) distant from the Sun based on parallax.[1] The radial velocity of this star is poorly constrained, but it appears to be drifting further away at the rate of +7 km/s.[3]

For other stars with this Bayer designation, see σ Gruis.
Sigma1 Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 36m 29.30230s[1]
Declination −40° 34′ 57.7391″[1]
Apparent magnitude (V) 6.26[2]
Characteristics
Spectral type A3 Vn[2]
B−V color index +0.12[2]
Astrometry
Radial velocity (Rv)+6.9±3.4[3] km/s
Proper motion (μ) RA: +46.00[4] mas/yr
Dec.: −72.64[4] mas/yr
Parallax (π)14.2651 ± 0.0751[1] mas
Distance229 ± 1 ly
(70.1 ± 0.4 pc)
Absolute magnitude (MV)+2.11[5]
Details[6]
Mass2.00 M☉
Radius2.0[7] R☉
Luminosity12[5] L☉
Surface gravity (log g)4.24±0.14 cgs
Temperature9,230±314 K
Rotational velocity (v sin i)163.4±2.0[8] km/s
Age194 Myr
Other designations
σ1 Gru, CD−41° 14959, FK5 3811, HD 214085, HIP 111594, HR 8600, SAO 231211[9]
Database references
SIMBADdata

This is an A-type main-sequence star with a stellar classification of A2 Vn; a star that is currently fusing its core hydrogen. It has a relatively high rate of spin as indicated by the 'n' suffix, showing a projected rotational velocity of 163 km/s.[8] This object is 194 million years old with double the mass[6] and radius of the Sun.[7] The star is radiating 12[5] times the luminosity of the Sun from its photosphere at an effective temperature of 9,230 K.[6] It is a source of X-ray emission, which may indicate it has an unseen stellar companion.[10]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Evans, D. S. (1966), "Fundamental data for Southern stars (6th list)", Royal Observatory Bulletin, 110: 185, Bibcode:1966RGOB..110..185E.
  3. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 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.
  4. 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.
  5. 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.
  6. 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  7. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (3rd ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  8. Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv:1012.4858, Bibcode:2011A&A...531A.143D, doi:10.1051/0004-6361/201016386, S2CID 119286673.
  9. "sig01 Gru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-24.
  10. Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
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