Astronomy:87 Pegasi
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Short description: Variable Star in the constellation Pegasus
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus[1] |
| Right ascension | 00h 09m 02.42s[2] |
| Declination | +18° 12′ 43.1″[2] |
| Apparent magnitude (V) | 5.53[3] |
| Characteristics | |
| Evolutionary stage | horizontal branch[4] |
| Spectral type | G9III[5] |
| B−V color index | +1.04[1] |
| Astrometry | |
| Radial velocity (Rv) | −19.85±0.13[2] km/s |
| Proper motion (μ) | RA: +140.876[2] mas/yr Dec.: −25.250[2] mas/yr |
| Parallax (π) | 10.8284 ± 0.0698[2] mas |
| Distance | 301 ± 2 ly (92.3 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.86[1] |
| Details | |
| Mass | 1.81[6] M☉ |
| Radius | 9.8[7] R☉ |
| Luminosity | 56[7] L☉ |
| Surface gravity (log g) | 2.70[7] cgs |
| Temperature | 4,811[6] K |
| Metallicity [Fe/H] | +0.04[6] dex |
| Age | 1.77[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
87 Pegasi (also known as HD 448) is a red giant star located in the northern constellation of Pegasus. With an apparent visual magnitude of 5.56, it is faintly visible to the naked eye under dark skies but requires good conditions or binoculars for reliable observation.[3]
Observation
The star was observed in ultraviolet by NASA's GALEX satellite to find correlation between chromosphere and coronal activity with many other red giant stars.[9]
Reference
- ↑ 1.0 1.1 1.2 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 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 "87 Pegasi - Star in Pegasus | TheSkyLive". https://theskylive.com/sky/stars/87-pegasi-star.
- ↑ Tautvaišienė, G.; Barisevičius, G.; Chorniy, Y.; Ilyin, I.; Puzeras, E. (2013). "Red clump stars of the Milky Way - laboratories of extra-mixing". Monthly Notices of the Royal Astronomical Society 430 (1): 621. doi:10.1093/mnras/sts663. Bibcode: 2013MNRAS.430..621T.
- ↑ Cenarro, A. J.; Peletier, R. F.; Sánchez-Blázquez, P.; Selam, S. O.; Toloba, E.; Cardiel, N.; Falcón-Barroso, J.; Gorgas, J. et al. (2007). "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters". Monthly Notices of the Royal Astronomical Society 374 (2): 664. doi:10.1111/j.1365-2966.2006.11196.x. Bibcode: 2007MNRAS.374..664C.
- ↑ 6.0 6.1 6.2 6.3 Maldonado, J.; Mirouh, G. M.; Mendigutía, I.; Montesinos, B.; Gragera-Más, J. L.; Villaver, E. (2025). "Intermediate-mass stars and the origin of the gas-giant planet-metallicity correlation". Astronomy and Astrophysics 695: A27. doi:10.1051/0004-6361/202453328. Bibcode: 2025A&A...695A..27M.
- ↑ 7.0 7.1 7.2 Maldonado, J.; Villaver, E.; Eiroa, C. (2013). "The metallicity signature of evolved stars with planets". Astronomy and Astrophysics 554: A84. doi:10.1051/0004-6361/201321082. Bibcode: 2013A&A...554A..84M.
- ↑ "87 Pegasi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=87+Pegasi.
- ↑ Crandall, Sara; Smith, Graeme H. (2023-02-01). "Correlations in Chromospheric and Coronal Activity Indicators of Giant Stars". The Astronomical Journal 165 (2): 70. doi:10.3847/1538-3881/aca150. ISSN 0004-6256. Bibcode: 2023AJ....165...70C.
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