49 Andromedae

49 Andromedae
Location of 49 Andromedae (circled)
Observation data
Epoch J2000      Equinox ICRS
Constellation Andromeda
Right ascension 01h 30m 06.10151s
Declination +47° 00′ 26.1811″
Apparent magnitude (V) 5.269
Characteristics
Evolutionary stage red clump
Spectral type K0 III
B−V color index 0.993
Astrometry
Radial velocity (Rv)−11.48 km/s
Proper motion (μ) RA: −0.950 mas/yr
Dec.: −42.638 mas/yr
Parallax (π)9.7947±0.1166 mas
Distance333 ± 4 ly
(102 ± 1 pc)
Absolute magnitude (MV)0.50
Details
Mass2.07 M☉
Radius11 R☉
Luminosity70.8 L☉
Surface gravity (log g)2.30 cgs
Temperature4,879±106 K
Metallicity [Fe/H]+0.020±0.04 dex
Rotational velocity (v sin i)2.0 km/s
Age1.75 Gyr
Other designations
a And, 49 And, BD+46°370, HD 9057, HIP 6999, HR 430, SAO 37275, PPM 44057, GSC 03282-02272
Database references
SIMBADdata

49 Andromedae is a star in the constellation Andromeda. 49 Andromedae is the Flamsteed designation (abbreviated 49 And), 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. The distance to 49 Andromedae, as determined from its annual parallax shift of 9.8 mas, is around 333 light-years. It is drifting closer to the Sun with a heliocentric radial velocity of −11.5 km/s.

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

This was one of the stars historically known as Adhil, from Arabic að-ðayl "the train [of a garment]", a name now applied to ξ Andromedae. In a 1971 NASA technical memorandum listing star names, 49 Andromedae was listed as Thail, likely derived from the same Arabic name.

References

  1. 1 2 3 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.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 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, S2CID 118505114.
  4. 1 2 3 4 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, S2CID 119211439.
  5. 1 2 3 Schmitt, John L. (January 1971), "Stars with Strong Cyanogen Absorption", Astrophysical Journal, 163: 75, Bibcode:1971ApJ...163...75S, doi:10.1086/150747.
  6. 1 2 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, S2CID 121883397.
  7. 1 2 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. 1 2 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. 1 2 "49 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 1, 2018.
  10. ↑ Allen, R.H. (1899), Star Names: Their Lore and Meaning, pp. 38–39
  11. ↑ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology.