Rho Lupi

Rho Lupi, Latinized from ρ Lupi, is a solitary[10] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 4.05.[2] Based upon an annual parallax shift of 10.32 mas as seen from Earth, it is located about 316 light years from the Sun. It is a member of the Upper Centaurus Lupus subgroup of the nearby Scorpius–Centaurus Association.[11]

Rho Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension  14h 37m 53.22583s[1]
Declination −49° 25′ 32.9798″[1]
Apparent magnitude (V) 4.05[2]
Characteristics
Spectral type B3/4 V[3]
U−B color index −0.56[2]
B−V color index −0.15[2]
Astrometry
Radial velocity (Rv)8.00±7.40[4] km/s
Proper motion (μ) RA: −28.26[1] mas/yr
Dec.: −28.82[1] mas/yr
Parallax (π)10.32 ± 0.16[1] mas
Distance316 ± 5 ly
(97 ± 2 pc)
Absolute magnitude (MV)−0.88[5]
Details
Mass4.66[6] M☉
Radius3.4[7] R☉
Luminosity365[8] L☉
Temperature15,947±542[6] K
Rotational velocity (v sin i)166[6] km/s
Age44[6] Myr
Other designations
ρ Lup, CD−48° 9198, FK5 3158, HD 128345, HIP 71536, HR 5453, SAO 225071.[9]
Database references
SIMBADdata

This is a B-type main sequence star with a stellar classification of B3/4 V.[3] It is a microvariable with a period of 10.7 hours and an amplitude of 0.0046 in magnitude.[12] With an age of just 44[6] million years, the star is spinning with a projected rotational velocity of 166 km/s.[6] This is giving the star an oblate shape with an equatorial bulge that is an estimated 6% larger than the polar radius.[13] It has an estimated 4.66[6] times the mass of the Sun and about 3.4[7] times the Sun's radius. It is radiating 365[8] times the solar luminosity from its outer atmosphere at an effective temperature of 15,947 K.[6]

References
  1. 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.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 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, A61.
  5. 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.
  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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. 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.
  9. "rho Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-10.
  10. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  11. Chen, Christine H.; et al. (September 2012), "A Spitzer MIPS Study of 2.5-2.0 M⊙ Stars in Scorpius-Centaurus", The Astrophysical Journal, 756 (2): 24, arXiv:1207.3415, Bibcode:2012ApJ...756..133C, doi:10.1088/0004-637X/756/2/133, 133.
  12. Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331: 45, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
  13. Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20: 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2.
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