Short description: Star in the constellation Andromeda
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49 Andromedae is a star in the constellation Andromeda.[1] 49 Andromedae is the Flamsteed designation (abbreviated 49 And),[9] though it also bears the Bayer designation A Andromedae.[8] It is visible to the naked eye under good viewing conditions with an apparent visual magnitude of 5.269.[3] The distance to 49 Andromedae, as determined from its annual parallax shift of 9.8 mas,[2] is around 333 light-years. It is drifting closer to the Sun with a heliocentric radial velocity of −11.5 km/s.[3]
With an estimated age of 1.75 Gyr[3] years, this is an aging red-clump[4] giant star with a stellar classification of K0 III,[5] indicating it is generating energy by helium fusion at its core. The spectrum displays "slightly strong" absorption lines of cyanogen (CN).[5] It has 2.07[3] times the mass of the Sun and has expanded to 11[6] times the Sun's radius. The star is radiating 71[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,879 K.[3] It is spinning with a projected rotational velocity of 2 km/s.[7]
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.[10] In a 1971 NASA technical memorandum listing star names, 49 Andromedae was listed as Thail, likely derived from the same Arabic name.[11]
References
- ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 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.
- ↑ 4.0 4.1 4.2 4.3 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.
- ↑ 5.0 5.1 5.2 Schmitt, John L. (January 1971), "Stars with Strong Cyanogen Absorption", Astrophysical Journal 163: 75, doi:10.1086/150747, Bibcode: 1971ApJ...163...75S.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 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.
- ↑ 8.0 8.1 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.
- ↑ 9.0 9.1 "49 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=49+And.
- ↑ Allen, R.H. (1899), Star Names: Their Lore and Meaning, p. 38-39, https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Andromeda*.html
- ↑ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology, https://ntrs.nasa.gov/api/citations/19720005197/downloads/19720005197.pdf.
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