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Sigma Sculptoris

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Variable star in the constellation Sculptor

Sigma Sculptoris
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
An ultraviolet light curve for Sigma Sculptoris, adapted from Manfroid and Renson (1994)
Constellation	Sculptor
Right ascension	01 02 26.43280
Declination	−31° 33′ 07.2237″
Apparent magnitude (V)	+5.54
Characteristics
Spectral type	A2V
U−B color index	+0.13
B−V color index	+0.06
Astrometry

Radial velocity (R_v)	−15.40±0.50 km/s
Proper motion (μ)	RA: +80.50 mas/yr Dec.: +14.64 mas/yr
Parallax (π)	14.04 ± 0.32 mas
Distance	232 ± 5 ly (71 ± 2 pc)
Absolute magnitude (M_V)	+1.24

Details
A
Mass	1.95 `M`_☉
Radius	2.0 `R`_☉
Luminosity	25.7 `L`_☉
Surface gravity (log g)	4.02±0.14 cgs
Temperature	8,470 K
Rotational velocity (v sin i)	82.1±1.2 km/s
Age	560 Myr
B
Mass	0.72 `M`_☉
Radius	0.67 `R`_☉
Temperature	4,530 K
Other designations
σ Scl, Sculptoris, CD−32° 410, HD 6178, HIP 4852, HR 293, SAO 192884
Database references
SIMBAD	data

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. Based upon an annual parallax shift of 14.04 mas as seen from Earth, it is located about 232 light years from the Sun.

The main component is an main sequence A-type star with a stellar classification of A1/A2 IV. It was suspected to be an Ap star and an Alpha2 Canum Venaticorum variable, but no chemical peculiarity or variability was found in 2018. The star has an estimated 1.95 the mass of the Sun and around two times the Sun's radius. It is spinning with a projected rotational velocity of 82 km/s and is about 560 million years old. Sigma Sculptoris radiates 25.7 times the solar luminosity from its photosphere at an effective temperature of 8,470 K.

The secondary is a small star with 72% the mass of the Sun, 5.7 times fainter than the primary.

References

Manfroid, J.; Renson, P. (January 1994). "Photometric variations of AP stars". Astronomy and Astrophysics. 281: 73–89. Bibcode:1994A&A...281...73M. Retrieved 20 September 2024.
^ 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.
^ 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.
^ 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.
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.
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.
^ 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.
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.
^ 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.
"sig Scl -- Variable Star of alpha2 CVn type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-13.
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.
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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Constellation of Sculptor

Bayer	α β γ δ ε ζ η θ ι κ κ λ λ μ ξ π σ τ
Variable	R BW
HD	4113 4208 (Cocibolca) 9578
Other	Gliese 1 Gliese 42 HE 2359-2844 LTT 9779 TOI-178 WASP-8 WASP-45 WD 0137−349

Exoplanets	HD 4113 b HD 4208 b TOI-178c WASP-8b

Star clusters	Blanco 1 NGC 288

NGC	7 10 24 55 101 115 131 134 148 150 174 254 264 289 300 314 334 365 378 409 415 418 423 424 427 438 439 441 461 491 526 527 544 549 612 613 626 630 7793 7812
Other	2MASX J00482185−2507365 occulting pair A2744 YD4 Abell 2744 Y1 Cartwheel Galaxy Comet Galaxy ESO 540-030 H2356-309 Haro 11 IC 5332 Sculptor Galaxy Sculptor Dwarf Galaxy Sculptor Dwarf Irregular Galaxy UNCOVER-z12 UNCOVER-z13

Galaxy clusters	Abell 2667 Abell 2744

Astronomical events	SN 2009gj

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