Sigma Sculptoris

Sigma Sculptoris

An ultraviolet light curve for Sigma Sculptoris, adapted from Manfroid and Renson (1994)[1]
Observation data
Epoch J2000.0      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 mas[2]
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

[edit]
  1. ^ Manfroid, J.; Renson, P. (January 1994). "Photometric variations of AP stars". Astronomy and Astrophysics. 281: 73–89. Bibcode:1994A&A...281...73M.
  2. ^ a b c d e f 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.
  3. ^ a b c d 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. Bibcode:1963MNRAS.127...83W. doi:10.1093/mnras/127.1.83.
  4. ^ a b 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.
  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. ^ a b c d e f g 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*". Research Notes of the AAS. 8 (4): 101. doi:10.3847/2515-5172/ad3de9. ISSN 2515-5172.
  8. ^ a b 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.
  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. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
  10. ^ a b 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. ^ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  13. ^ a b Janík, Jan; Krtička, Jiří; Mikulášek, Zdeněk; Zverko, Juraj; Pintado, Olga; Paunzen, Ernst; Prvák, Milan; Skalický, Jan; Zejda, Miloslav; Adam, Christian (2018). "A Binary Nature of the Marginal CP Star Sigma Sculptoris". Publications of the Astronomical Society of the Pacific. 130 (987). Bibcode:2018PASP..130e4203J. doi:10.1088/1538-3873/aab142. hdl:11336/81068.
  14. ^ 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.
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