Astronomy:12 Pegasi
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Short description: K-type supergiant star in the constellation of Pegasus
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 46m 04.364s[1] |
| Declination | +22° 56′ 55.96″[1] |
| Apparent magnitude (V) | +5.266[2] |
| Characteristics | |
| Evolutionary stage | Supergiant |
| Spectral type | K0IbHdel0.5[3] |
| U−B color index | +1.33[4] |
| B−V color index | +1.41[4] |
| Astrometry | |
| Radial velocity (Rv) | −10.14±0.20[5] km/s |
| Proper motion (μ) | RA: 8.299[1][1] mas/yr Dec.: −2.478[1] mas/yr |
| Parallax (π) | 2.3673 ± 0.1279[1] mas |
| Distance | 1,380 ± 70 ly (420 ± 20 pc) |
| Absolute magnitude (MV) | −4.03[4] |
| Details | |
| Mass | 6.3[6] M☉ |
| Radius | 81[7] R☉ |
| Luminosity | 1,722–1,820[7] L☉ |
| Surface gravity (log g) | 1.11[8] cgs |
| Temperature | 4,185[7] K |
| Metallicity [Fe/H] | +0.03[8] dex |
| Rotational velocity (v sin i) | 19.5[9] km/s |
| Age | 19.8[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
12 Pegasi is a K-type supergiant star in the northern constellation of Pegasus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.3.[2] Based on parallax measurements, it is located at a distance of approximately 1,380 light-years (420 pc) from the Earth. The star is drifting closer with a line of sight velocity component of −10.1 km/s.[5]
This evolved star has a spectral type of K0Ib Hdel0.5,[11] which indicates that it is a less luminous K-type supergiant with strong H-δ Balmer lines. It is an estimated 20[6] million years old and is spinning with a projected rotational velocity of 19.5 km/s.[9] With 6.3 times the mass of the Sun,[6] it has expanded to 81 times the radius of the Sun. The star is radiating 1,722–1,820[7] times the luminosity of the Sun from its photosphere at an effective temperature of 4,185 K.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. 1794238260239888768 Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". The Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. ISSN 0067-0049. Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 4.2 Melnik, A. M.; Dambis, A. K. (2020). "VizieR Online Data Catalog: Kinematic data for high luminosity stars (Melnik+, 2020)". Vizier Online Data Catalog (Other). Bibcode: 2020yCatp017036502M.
- ↑ 5.0 5.1 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. 1794238260239888768 Gaia DR2 record for this source at VizieR.
- ↑ 6.0 6.1 6.2 6.3 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.
- ↑ 7.0 7.1 7.2 7.3 7.4 Messineo, M.; Brown, A. G. A. (July 2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal 158 (1): 20. doi:10.3847/1538-3881/ab1cbd. ISSN 0004-6256. Bibcode: 2019AJ....158...20M.
- ↑ 8.0 8.1 Wu, Yue et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W.
- ↑ 9.0 9.1 De Medeiros, J. R. et al. (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. https://repositorio.ufrn.br/bitstream/123456789/28828/1/ACatalogOfRotationalAndRadial_Medeiros_2014.pdf.
- ↑ "12 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=12+Peg.
- ↑ Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series 71: 245–266. doi:10.1086/191373. ISSN 0067-0049. Bibcode: 1989ApJS...71..245K.
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