49 Persei

49 Persei is a star in the northern constellation of Perseus. It is just visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 6.09.[2] Based upon parallax measurements, this star is located around 147.7 light-years (45.27 parsecs) away from the Sun, but is drifting closer with a radial velocity of −44 km/s.[2] It has a relatively large proper motion, traversing the celestial sphere at a rate of 0.220″·yr−1.[6]

49 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04h 08m 15.38813s[1]
Declination +37° 43′ 38.9875″[1]
Apparent magnitude (V) 6.07[2]
Characteristics
Spectral type K1 III[3]
B−V color index 0.943±0.003[2]
Astrometry
Radial velocity (Rv)−44.35±0.20[2] km/s
Proper motion (μ) RA: −98.909[1] mas/yr
Dec.: −195.772[1] mas/yr
Parallax (π)22.0897 ± 0.0483[1] mas
Distance147.7 ± 0.3 ly
(45.27 ± 0.10 pc)
Absolute magnitude (MV)2.85[2]
Details
Mass1.38[4] M☉
Radius3.72+0.10
−0.09[1] R☉
Luminosity7.95±0.03[1] L☉
Surface gravity (log g)3.45[4] cgs
Temperature5,028+61
−70[1] K
Metallicity [Fe/H]0.02±0.04[2] dex
Age3.93[4] Gyr
Other designations
40 Per, BD+37°881, HD 25975, HIP 19302, HR 1277, SAO 57000[5]
Database references
SIMBADdata

This is an aging red giant star with a stellar classification of K1III, a star that has used up its core hydrogen and has expanding. It is a candidate horizontal branch star, which would indicate it is past the red giant branch stage and is fusing helium at its core.[7] The star is nearly four[4] billion years old with 1.4[4] times the mass of the Sun and 3.7[1] times the Sun's radius. It is radiating eight[1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,028 K.[1]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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.
  3. Roman, Nancy G. (December 1955), "A Catalogue of High-Velocity Stars", The Astrophysical Journal Supplement Series, 2: 195, Bibcode:1955ApJS....2..195R, doi:10.1086/190021, ISSN 0067-0049.
  4. Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, 21.
  5. "49 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-18.
  6. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
  7. Afșar, Melike; et al. (June 2018), "A Spectroscopic Survey of Field Red Horizontal-branch Stars", The Astronomical Journal, 155 (6): 25, arXiv:1804.04477, Bibcode:2018AJ....155..240A, doi:10.3847/1538-3881/aabe86, 240.
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