Iota Lupi
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Lupus |
Right ascension | 14h 19m 24.22219s[1] |
Declination | −46° 03′ 29.1437″[1] |
Apparent magnitude (V) | 3.54[2] |
Characteristics | |
Spectral type | B2.5 IV[3] |
U−B color index | −0.742[2] |
B−V color index | −0.180[2] |
Astrometry | |
Radial velocity (Rv) | 21.6±4.1[4] km/s |
Proper motion ( | RA: −12.56[1] mas/yr Dec.: −4.76[1] mas/yr |
Parallax ( | 9.65 ± 0.20 mas[1] |
Distance | 338 ± 7 ly (104 ± 2 pc) |
Absolute magnitude (MV) | −1.48[5] |
Details | |
Mass | 6.9±0.1[6] M☉ |
Radius | 4.05±0.33[7] R☉ |
Luminosity (bolometric) | 2,082[8] L☉ |
Surface gravity (log g) | 3.94±0.07[7] cgs |
Temperature | 18,605±221[7] K |
Metallicity [Fe/H] | +0.19±0.15[7] dex |
Rotational velocity (v sin i) | 370[9] km/s |
Age | 20.3±4.8[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This star has the spectrum of a B-type subgiant star with a stellar classification of B2.5 IV,[3] which may indicate that it has used up its core supply of hydrogen and has begun to expand off the main-sequence. It is rotating rapidly with a projected rotational velocity of 370 km/s.[9] This is giving the star an oblate shape with an equatorial bulge that is an estimated 12% larger than the polar radius.[13] It is about 20[6] million years old with 6.9[6] times the mass of the Sun and 4[7] times the Sun's radius. The star radiates 2,082[8] times the solar luminosity from its outer atmosphere at an effective temperature of 18,605[7] K.
References[edit]
- ^ a b c d e 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.
- ^ a b c d Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168.
- ^ a b Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313–326, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.
- ^ 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.
- ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ a b c d e 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b c d e f Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018.
- ^ a b Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
- ^ a b Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
- ^ "iot Lup -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-03-05.
- ^ 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, S2CID 14878976.
- ^ de Geus, E. J.; et al. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics, 216 (1–2): 44–61, Bibcode:1989A&A...216...44D.
- ^ Belle, G. T. (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.
External links[edit]
- Kaler, James B. (August 9, 2013), "Iota Lupi", Stars, University of Illinois, retrieved 2017-03-06.