HD 79447
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 09h 11m 16.72089s[1] |
| Declination | −62° 19′ 01.1295″[1] |
| Apparent magnitude (V) | +3.96[2] |
| Characteristics | |
| Spectral type | B3V[3] |
| B−V color index | −0.180±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | +17.5±2.7[2] km/s |
| Proper motion (μ) | RA: −37.48[1] mas/yr Dec.: +14.59[1] mas/yr |
| Parallax (π) | 6.01±0.12 mas [1] |
| Distance | 540 ± 10 ly (166 ± 3 pc) |
| Absolute magnitude (MV) | −2.14[2] |
| Details | |
| Mass | 7.0±0.1[4] M☉ |
| Radius | 5.6[5] R☉ |
| Luminosity | 2,054.17[2] L☉ |
| Surface gravity (log g) | 3.5±0.1[3] cgs |
| Temperature | 18,900±500[3] K |
| Rotational velocity (v sin i) | 0[6] km/s |
| Age | 39.2±7.0[4] Myr |
| Other designations | |
| i Car, CPD−61°1201, GC 12707, HD 79447, HIP 45101, HR 3663, SAO 250471[7] | |
| Database references | |
| SIMBAD | data |
HD 79447 is a single[8] star in the southern constellation of Carina. It has the Bayer designation i Carinae, while HD 79447 is the identifier from the Henry Draper catalogue . This star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.96.[2] It is located at a distance of approximately 540 light years from the Sun based on parallax,[1] and has an absolute magnitude of −2.14.[2] The star drifting further away with a radial velocity of +18 km/s.[2] It is a candidate member of the Lower Centaurus–Crux group of the Sco OB2 association.[9]
This object is a B-type main-sequence star with a stellar classification of B3V.[3] A surface magnetic field has been detected with a strength on the order of 1 kG .[9] It has an estimated age of around 39[4] million years with no measured spin rate.[6] The star has about 5.6[5] times the radius of the Sun and 7[4] times the Sun's mass. It is radiating over two thousand[2] times the luminosity of the Sun from its photosphere at an effective temperature of 18,900 K.[3]
References
[edit ]- ^ a b c d e f 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 .
- ^ a b c d e f g h i 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
- ^ a b c d e Levenhagen, R. S.; Leister, N. V. (2006), "Spectroscopic analysis of southern B and Be stars", Monthly Notices of the Royal Astronomical Society, 371 (1): 252–262, arXiv:astro-ph/0606149 , Bibcode:2006MNRAS.371..252L, doi:10.1111/j.1365-2966.2006.10655.x , S2CID 16492030.
- ^ a b c d 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 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.
- ^ 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.
- ^ "HD 79447". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020年01月25日.
- ^ Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925–1929, arXiv:1205.5238 , Bibcode:2012MNRAS.424.1925C, doi:10.1111/j.1365-2966.2012.21317.x , S2CID 119120749.
- ^ a b Neiner, Coralie; et al. (November 2015), "Discovery of two new bright magnetic B stars: i Car and Atlas", Monthly Notices of the Royal Astronomical Society: Letters, 454 (1): L56 – L60, arXiv:1508.06784 , Bibcode:2015MNRAS.454L..56N, doi:10.1093/mnrasl/slv128 .