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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]

This is an aging red giant star with a stellar classification of K1III, a star that has used up its core hydrogen and is 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. ^ a b c d e f g h i j k 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. ^ a b c d e f g 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, S2CID 119257644.
  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. ^ a b c d e 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, S2CID 119511744, 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, S2CID 2603568.
  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, S2CID 119336618, 240.