HD 137058

This article is about k Lupi. Not to be confused with κ (kappa) Lupi.

HD 137058 is a star in the southern constellation of Lupus. Eggleton and Tokovinin (2008) list it as a single star,^[9] although Nitschelm and David (2011) noted it may be a double-lined spectroscopic binary.^[10] Its apparent visual magnitude is 4.60,^[2] which is bright enough to be visible to the naked eye. Based upon an annual parallax shift of 13.6 mas,^[1] it is located 240 light years away.

HD 137058

Observation data Epoch J2000      Equinox J2000
Constellation	Lupus
Right ascension	15h 25m 20.20923s[1]
Declination	−38° 44′ 00.8803″[1]
Apparent magnitude (V)	4.60[2]
Characteristics
Spectral type	A0 V[3]
B−V color index	0.000±0.015[2]
Astrometry
Radial velocity (Rv)	−3.0±2.8[4] km/s
Proper motion (μ)	RA: −41.573[1] mas/yr Dec.: −24.603[1] mas/yr
Parallax (π)	13.6178 ± 0.4759 mas[1]
Distance	240 ± 8 ly (73 ± 3 pc)
Absolute magnitude (MV)	−0.76[2]
Details
Radius	3.0[5] R☉
Luminosity	155.71[6] L☉
Temperature	8,178[6] K
Rotational velocity (v sin i)	300.0[7] km/s
Other designations
k Ser, CD−38° 10289, HD 137058, HIP 75501, HR 5724, SAO 206616[8]
Database references
SIMBAD	data

The stellar classification of the primary component is A0 V,^[3] matching an A-type main-sequence star. It is spinning rapidly with a projected rotational velocity of 300 km/s, giving it an oblate shape with an equatorial radius 22% larger than the polar radius.^[7] The star is radiating 156 times the Sun's luminosity from its photosphere at an effective temperature of 8,178 K.^[6]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
2. 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.
3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
4. 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.
5. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
6. McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
7. van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
8. "HD 137058". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-29.
9. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
10. Nitschelm, C.; David, M. (September 2011), "An Investigation on Close Binaries in the Sco-Cen Complex", in Schmidtobreick, Linda; Schreiber, Matthias R.; Tappert, Claus (eds.), Evolution of compact binaries. Proceedings of a workshop held at Hotel San Martín, Viña del Mar, Chile 6-11 May 2011, ASP Conference Proceedings, vol. 447, San Francisco, CA: Astronomical Society of the Pacific, p. 75, Bibcode:2011ASPC..447...75N.