49 Andromedae

49 Andromedae (abbreviated 49 And) is a star in the constellation Andromeda. 49 Andromedae is the Flamsteed designation though it also bears the Bayer designation A Andromedae. It is visible to the naked eye under good viewing conditions with an apparent visual magnitude of 5.269.[2] The distance to 49 Andromedae, as determined from its annual parallax shift of 10.4 mas,[1] is around 314 light years. It is moving closer to the Sun with a heliocentric radial velocity of −11.5 km/s.[2]

49 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  01h 30m 06.10154s[1]
Declination +47° 00′ 26.1860″[1]
Apparent magnitude (V) 5.269[2]
Characteristics
Spectral type K0 III[3]
B−V color index 0.993[2]
Astrometry
Radial velocity (Rv)−11.48[2] km/s
Proper motion (μ) RA: −0.939[1] mas/yr
Dec.: −42.969[1] mas/yr
Parallax (π)10.3989 ± 0.1605[1] mas
Distance314 ± 5 ly
(96 ± 1 pc)
Absolute magnitude (MV)0.50[4]
Details
Mass2.07[2] M☉
Radius11[5] R☉
Luminosity70.8[2] L☉
Surface gravity (log g)2.30[6] cgs
Temperature4,879±106[2] K
Metallicity [Fe/H]+0.020±0.04[6] dex
Rotational velocity (v sin i)2.0[7] km/s
Age1.75[2] Gyr
Other designations
A And[8], 49 And, BD+46° 370, HD 9057, HIP 6999, HR 430, SAO 37275, GSC 03282-02272[9]
Database references
SIMBADdata

With an estimated age of 1.75 Gyr[2] years, this is an aging red clump[6] giant star with a stellar classification of K0 III,[3] indicating it is generating energy by helium fusion at its core. The spectrum displays "slightly strong" absorption lines of cyanogen (CN).[3] It has 2.07[2] times the mass of the Sun and has expanded to 11[5] times the Sun's radius. The star is radiating 71[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,879 K.[2]

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.
  2. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
  3. Schmitt, John L. (January 1971), "Stars with Strong Cyanogen Absorption", Astrophysical Journal, 163: 75, Bibcode:1971ApJ...163...75S, doi:10.1086/150747.
  4. 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.
  5. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  6. Tautvaišienė, G.; et al. (March 2013), "Red clump stars of the Milky Way - laboratories of extra-mixing", Monthly Notices of the Royal Astronomical Society, 430 (1): 621−627, arXiv:1304.4393, Bibcode:2013MNRAS.430..621T, doi:10.1093/mnras/sts663.
  7. De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
  8. Tirion, W.; et al. (1987), Willmann-Bell, Inc. (ed.), Uranometria 2000.0 - Volume II - The Southern Hemisphere to +6°, Richmond, Virginia, USA, ISBN 0-943396-15-8.
  9. "49 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 1, 2018.
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