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]
| 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 mas[1] |
| Distance | 314 ± 5 ly (96 ± 1 pc) |
| Absolute magnitude (MV) | 0.50[4] |
| Details | |
| Mass | 2.07[2] M☉ |
| Radius | 11[5] R☉ |
| Luminosity | 70.8[2] L☉ |
| Surface gravity (log g) | 2.30[6] cgs |
| Temperature | 4,879±106[2] K |
| Metallicity [Fe/H] | +0.020±0.04[6] dex |
| Rotational velocity (v sin i) | 2.0[7] km/s |
| Age | 1.75[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ^ a b c d e f 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.
- ^ a b c d e f g h i j k l m 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.
- ^ a b c Schmitt, John L. (January 1971), "Stars with Strong Cyanogen Absorption", Astrophysical Journal, 163: 75, Bibcode:1971ApJ...163...75S, doi:10.1086/150747.
- ^ 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.
- ^ a b 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.
- ^ a b c 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.
- ^ 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.
- ^ 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.
- ^ "49 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 1, 2018.