Astronomy:Sigma Sculptoris

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Short description: Variable star in the constellation Sculptor
Sigma Sculptoris
Observation data
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[1] mas
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

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.

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Westerlund, B. E. (1963), "Three-colour photometry of early-type stars near the galactic poles", Monthly Notices of the Royal Astronomical Society 127: 83, doi:10.1093/mnras/127.1.83, Bibcode: 1963MNRAS.127...83W. 
  3. ↑ 3.0 3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H. 
  4. ↑ 4.0 4.1 Samus, N. N. 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  6. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  8. ↑ 8.0 8.1 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 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  9. ↑ 9.0 9.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M. 
  10. ↑ 10.0 10.1 Díaz, C. G. et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics 531: A143, doi:10.1051/0004-6361/201016386, Bibcode: 2011A&A...531A.143D. 
  11. ↑ "sig Scl -- Variable Star of alpha2 CVn type", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=sig+Scl, 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  13. ↑ Catalano, F. A.; Renson, P. (February 1998), "The observed periods of AP and BP stars", Astronomy and Astrophysics Supplement 127 (3): 421–422, doi:10.1051/aas:1998110, Bibcode: 1998A&AS..127..421C. 



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