Astronomy:Rho Lupi
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h 37m 53.22583s[2] |
| Declination | −49° 25′ 32.9798″[2] |
| Apparent magnitude (V) | 4.05[3] |
| Characteristics | |
| Spectral type | B3/4 V[4] |
| U−B color index | −0.56[3] |
| B−V color index | −0.15[3] |
| Astrometry | |
| Radial velocity (Rv) | 8.00±7.40[5] km/s |
| Proper motion (μ) | RA: −28.26[2] mas/yr Dec.: −28.82[2] mas/yr |
| Parallax (π) | 10.32 ± 0.16[2] mas |
| Distance | 316 ± 5 ly (97 ± 2 pc) |
| Absolute magnitude (MV) | −0.88[6] |
| Details | |
| Mass | 4.66[7] M☉ |
| Radius | 3.4[8] R☉ |
| Luminosity | 365[9] L☉ |
| Temperature | 15,947±542[7] K |
| Rotational velocity (v sin i) | 166[7] km/s |
| Age | 44[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho Lupi, Latinized from ρ Lupi, is a solitary[11] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 4.05.[3] 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.[12]
This is a B-type main sequence star with a stellar classification of B3/4 V.[4] It is a microvariable with a period of 10.7 hours and an amplitude of 0.0046 in magnitude.[13] With an age of just 44[7] million years, the star is spinning with a projected rotational velocity of 166 km/s.[7] This is giving the star an oblate shape with an equatorial bulge that is an estimated 6% larger than the polar radius.[14] It has an estimated 4.66[7] times the mass of the Sun and about 3.4[8] times the Sun's radius. It is radiating 365[9] times the solar luminosity from its outer atmosphere at an effective temperature of 15,947 K.[7]
References
- ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 24 September 2022.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 3.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 4.0 4.1 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.
- ↑ 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.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 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.
- ↑ 8.0 8.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 9.0 9.1 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.
- ↑ "rho Lup". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=rho+Lup.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1088/0004-637X/756/2/133, 133, Bibcode: 2012ApJ...756..133C.
- ↑ Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society 331 (1): 45–59, doi:10.1046/j.1365-8711.2002.05150.x, Bibcode: 2002MNRAS.331...45K.
- ↑ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
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