Astronomy:Sigma Sculptoris

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Short description: Binary star in the constellation Sculptor
Sigma Sculptoris
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An ultraviolet light curve for Sigma Sculptoris, adapted from Manfroid and Renson (1994)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sculptor
Right ascension  01h 02m 26.43280s[2]
Declination −31° 33′ 07.2237″[2]
Apparent magnitude (V) +5.54[3]
Characteristics
Spectral type A1/2 IV[4]
U−B color index +0.13[3]
B−V color index +0.06[3]
Astrometry
Radial velocity (Rv)−15.40±0.50[5] km/s
Proper motion (μ) RA: +80.50[2] mas/yr
Dec.: +14.64[2] mas/yr
Parallax (π)14.04 ± 0.32[2] mas
Distance232 ± 5 ly
(71 ± 2 pc)
Absolute magnitude (MV)+1.24[6]
Orbit[7]
Period (P)46.9 days
Semi-major axis (a)0.35 au
Eccentricity (e)0.195
Inclination (i)27° or 135°
Semi-amplitude (K1)
(primary)		10.3 km/s
Details[7]
A
Mass1.95 M☉
Radius2.0 R☉
Luminosity25.7[8] L☉
Surface gravity (log g)4.02±0.14[9] cgs
Temperature8,470 K
Rotational velocity (v sin i)82.1±1.2[10] km/s
Age560 Myr
B
Mass0.72 M☉
Radius0.67 R☉
Temperature4,530 K
Other designations
σ Scl, CD−32°410, HD 6178, HIP 4852, HR 293, SAO 192884[11]
Database references
SIMBADdata

Sigma Sculptoris, Latinized from σ Sculptoris, is a binary star in the southern constellation of Sculptor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.54.[3] Based upon an annual parallax shift of 14.04 mas as seen from Earth,[2] it is located about 232 light years from the Sun.

The main component is a A-type star with a stellar classification of A1/A2 IV,[4] although many modern papers use a spectral class of A2V and describe Sigma Sculptoris as a somewhat evolved main sequence star.[7] It was suspected to be an Ap[12] or Am star,[13] and an Alpha2 Canum Venaticorum variable,[14] but no chemical peculiarity or variability was found in 2018.[13] The star has an estimated 1.95 the mass of the Sun and around two times the Sun's radius.[7] It is spinning with a projected rotational velocity of 82 km/s[10] and is about 560 million years old.[7] Sigma Sculptoris radiates 25.7[8] times the solar luminosity from its photosphere at an effective temperature of 8,470 K.[7]

The secondary is a relatively small star with 72% the mass of the Sun, 5.7 magnitudes fainter than the primary.[7]

References

  1. ↑ Manfroid, J.; Renson, P. (January 1994). "Photometric variations of AP stars". Astronomy and Astrophysics 281: 73–89. Bibcode: 1994A&A...281...73M. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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. 
  3. ↑ 3.0 3.1 3.2 3.3 Westerlund, B. E. (1963). "Three-colour photometry of early-type stars near the galactic poles". Monthly Notices of the Royal Astronomical Society 127 (1): 83. doi:10.1093/mnras/127.1.83. Bibcode: 1963MNRAS.127...83W. 
  4. ↑ 4.0 4.1 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. 
  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 Waisberg, Idel; Klein, Ygal; Katz, Boaz (April 2024). "Hidden Companions to Intermediate-mass Stars. XVII. Uncovering a 0.72 M⊙, 0.35 au Companion in the Spectroscopic Binary Sigma Sculptoris*" (in en). Research Notes of the AAS 8 (4): 101. doi:10.3847/2515-5172/ad3de9. ISSN 2515-5172. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 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. 
  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. ↑ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics 498 (3): 961. doi:10.1051/0004-6361/200810788. Bibcode: 2009A&A...498..961R. 
  13. ↑ 13.0 13.1 Janík, Jan; Krtička, Jiří; Mikulášek, Zdeněk; Zverko, Juraj; Pintado, Olga; Paunzen, Ernst; Prvák, Milan; Skalický, Jan et al. (2018). "A Binary Nature of the Marginal CP Star Sigma Sculptoris". Publications of the Astronomical Society of the Pacific 130 (987). doi:10.1088/1538-3873/aab142. Bibcode: 2018PASP..130e4203J. 
  14. ↑ 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. 



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