Astronomy:49 Andromedae

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Short description: Star in the constellation Andromeda
49 Andromedae
Observation data
Equinox J2000.0]] (ICRS)
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, PPM 44057, GSC 03282-02272[9]
Database references
SIMBADdata

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]

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. 
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L. 
  3. ↑ 3.0 3.1 3.2 Schmitt, John L. (January 1971), "Stars with Strong Cyanogen Absorption", Astrophysical Journal 163: 75, doi:10.1086/150747, Bibcode: 1971ApJ...163...75S. 
  4. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  5. ↑ 5.0 5.1 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  6. ↑ 6.0 6.1 6.2 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, doi:10.1093/mnras/sts663, Bibcode: 2013MNRAS.430..621T. 
  7. ↑ De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=49+And. 



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