Astronomy:HD 79447
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Carina[1] |
| Right ascension | 09h 11m 16.72089s[2] |
| Declination | −62° 19′ 01.1295″[2] |
| Apparent magnitude (V) | +3.96[1] |
| Characteristics | |
| Spectral type | B3V[3] |
| B−V color index | −0.180±0.006[1] |
| Astrometry | |
| Radial velocity (Rv) | +17.5±2.7[1] km/s |
| Proper motion (μ) | RA: −37.48[2] mas/yr Dec.: +14.59[2] mas/yr |
| Parallax (π) | 6.01 ± 0.12[2] mas |
| Distance | 540 ± 10 ly (166 ± 3 pc) |
| Absolute magnitude (MV) | −2.14[1] |
| Details | |
| Mass | 7.0±0.1[4] M☉ |
| Radius | 5.6[5] R☉ |
| Luminosity | 2,054.17[1] 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 | |
| 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.[1] It is located at a distance of approximately 540 light years from the Sun based on parallax,[2] and has an absolute magnitude of −2.14.[1] The star drifted further away with a radial velocity of +18 km/s.[1] 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[1] times the luminosity of the Sun from its photosphere at an effective temperature of 18,900 K.[3]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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, https://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html.
- ↑ 3.0 3.1 3.2 3.3 3.4 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, doi:10.1111/j.1365-2966.2006.10655.x, Bibcode: 2006MNRAS.371..252L.
- ↑ 4.0 4.1 4.2 4.3 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.
- ↑ 5.0 5.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 6.0 6.1 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+79447.
- ↑ 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, doi:10.1111/j.1365-2966.2012.21317.x, Bibcode: 2012MNRAS.424.1925C.
- ↑ 9.0 9.1 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, doi:10.1093/mnrasl/slv128, Bibcode: 2015MNRAS.454L..56N.
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