Astronomy:HD 115211
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Musca |
| Right ascension | 13h 17m 13.01064s[1] |
| Declination | −66° 47′ 00.3789″[1] |
| Apparent magnitude (V) | 4.86[2] |
| Characteristics | |
| Spectral type | K2 Ib-II[3] |
| B−V color index | 1.480±0.004[2] |
| Variable type | Suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | −10.38±0.17[1] km/s |
| Proper motion (μ) | RA: −15.03±0.20[2] mas/yr Dec.: −6.63±0.17[2] mas/yr |
| Parallax (π) | 2.3868 ± 0.1235[1] mas |
| Distance | 1,370 ± 70 ly (420 ± 20 pc) |
| Absolute magnitude (MV) | −2.94[2] |
| Details | |
| Mass | 7.1±0.8[5] M☉ |
| Radius | 123.18+2.84 −8.96[1] R☉ |
| Luminosity | 3,849±234[1] L☉ |
| Temperature | 4,097+158 −47[1] K |
| Rotational velocity (v sin i) | 2.5±1.2[6] km/s |
| Age | 39.8±4.9[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 115211 is a single[8] star in the southern constellation of Musca. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.86.[2] Its distance from Earth is approximately 1,370 light years based on parallax, and it is drifting closer to the Sun with a radial velocity of −10 km/s.[1] It has an absolute magnitude of −2.94.[2]
It is an aging bright giant/supergiant star with a stellar classification of K2 Ib-II.[3] It is a suspected variable star of unknown type, with a brightness that has been measured ranging from 4.83 down to 4.87.[4] It is an estimated 40 million years old, with 7.1 times the mass of the Sun.[5] With the supply of hydrogen exhausted at its core, it has expanded to 123 times the Sun's radius. It is radiating 3,849 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,097 K.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S
- ↑ 5.0 5.1 5.2 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 Medeiros, J. R. et al. (November 2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics 395: 97–98. doi:10.1051/0004-6361:20021214. Bibcode: 2002A&A...395...97D.
- ↑ "HD 115211". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+115211.
- ↑ 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.
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