Astronomy:Phi2 Lupi
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 23m 09.35005s[1] |
| Declination | −36° 51′ 30.5521″[1] |
| Apparent magnitude (V) | 4.535[2] |
| Characteristics | |
| Spectral type | B4 V[3][4] |
| U−B color index | −0.648[2] |
| B−V color index | −0.161[2] |
| Astrometry | |
| Radial velocity (Rv) | +0.80±2.70[5] km/s |
| Proper motion (μ) | RA: −18.24[1] mas/yr Dec.: −20.72[1] mas/yr |
| Parallax (π) | 6.28 ± 0.20[1] mas |
| Distance | 520 ± 20 ly (159 ± 5 pc) |
| Absolute magnitude (MV) | −1.47[6] |
| Details | |
| Mass | 6.1±0.1[4] M☉ |
| Radius | 3.4[7] R☉ |
| Luminosity | 800[8] L☉ |
| Temperature | 16,780[3] K |
| Rotational velocity (v sin i) | 141±6[3] km/s |
| Age | 39.9±10.1[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi2 Lupi, Latinized from φ2 Lupi, is a solitary[10] star in the southern constellation of Lupus. With an apparent magnitude of 4.535,[2] it is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 6.28 mas as seen from Earth, it is located around 520 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.052±0.013 due to interstellar dust. It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.[11]
This is an ordinary B-type main sequence star with a stellar classification of B4 V.[3][4] It has an estimated 6.1[4] times the mass of the Sun and about 3.4[7] times the Sun's radius. The star is roughly 40[4] million years and is spinning with a projected rotational velocity of 141 km/s.[3] It is radiating about 800[8] times the solar luminosity from its photosphere at an effective temperature of 16,780 K.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 2.2 2.3 Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series 61: 387–405, Bibcode: 1985A&AS...61..387K.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Bragança, G. A. et al. (November 2012), "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk", The Astronomical Journal 144 (5): 10, doi:10.1088/0004-6256/144/5/130, 130, Bibcode: 2012AJ....144..130B.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 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 Pasinetti Fracassini, L. E. et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics 367 (2): 521–24, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 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.
- ↑ "phi02 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=phi02+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.
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