Sigma Sculptoris

Sigma Sculptoris, Latinized from σ Sculptoris, is a solitary,[12] white-hued star in the southern constellation of Sculptor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.54.[2] Based upon an annual parallax shift of 14.04 mas as seen from Earth,[1] it is located about 232 light years from the Sun.

Sigma Sculptoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension 01h 02m 26.43280s[1]
Declination −31° 33′ 07.2237″[1]
Apparent magnitude (V) +5.54[2]
Characteristics
Spectral type A1/A2 IV[3]
U−B color index +0.13[2]
B−V color index +0.06[2]
Variable type α2 CVn[4]
Astrometry
Radial velocity (Rv)−15.40±0.50[5] km/s
Proper motion (μ) RA: +80.50[1] mas/yr
Dec.: +14.64[1] mas/yr
Parallax (π)14.04 ± 0.32 mas[1]
Distance232 ± 5 ly
(71 ± 2 pc)
Absolute magnitude (MV)+1.24[6]
Details
Mass2.07[7] M☉
Radius2.2[8] R☉
Luminosity25.7[9] L☉
Surface gravity (log g)4.02±0.14[7] cgs
Temperature9,005±306[7] K
Rotational velocity (v sin i)82.1±1.2[10] km/s
Age464[7] Myr
Other designations
σ Scl,  Sculptoris, CD−32° 410, HD 6178, HIP 4852, HR 293, SAO 192884[11]
Database references
SIMBADdata

This is an A-type subgiant with a stellar classification of A1/A2 IV.[3] It is a suspected Ap star and is classified as an Alpha2 Canum Venaticorum variable[4] with a periodicity of 2.37 days.[13] The star has an estimated 2.07[7] the mass of the Sun and around 2.2[8] times the Sun's radius. It is spinning with a projected rotational velocity of 82 km/s[10] and is about 464 million years old.[7] Sigma Sculptoris radiates 25.7[9] times the solar luminosity from its photosphere at an effective temperature of 9005 K.[7]

References
  1. 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.
  2. Westerlund, B. E. (1963), "Three-colour photometry of early-type stars near the galactic poles", Monthly Notices of the Royal Astronomical Society, 127: 83, Bibcode:1963MNRAS.127...83W, doi:10.1093/mnras/127.1.83.
  3. Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  4. Samus, N. N.; Durlevich, O. V.; et al. (2009). "General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. 1. Bibcode:2009yCat....102025S.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. 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.
  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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  8. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  9. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  10. 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.
  11. "sig Scl -- Variable Star of alpha2 CVn type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-13.
  12. 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.
  13. Catalano, F. A.; Renson, P. (February 1998), "The observed periods of AP and BP stars", Astronomy and Astrophysics Supplement, 127 (3): 421–422, Bibcode:1998A&AS..127..421C, doi:10.1051/aas:1998110.
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