3 Andromedae

3 Andromedae, abbreviated 3 And, is a single[11] star in the northern constellation of Andromeda. 3 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.64.[2] The distance to this star, as determined from an annual parallax shift of 18 mas,[1] is 181 light years. It is moving closer to the Earth with a heliocentric radial velocity of −35 km/s,[5] and has a relatively large proper motion, traversing the celestial sphere at 0.236″·yr−1.[12]

Not to be confused with Andromeda III.
3 Andromedae
3 Andromedae (circled) in a close northerly run-of-stars asterism – 5, 7, 8, 11 being close by, south-westward.
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 04m 10.98185s[1]
Declination +50° 03′ 07.5297″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Evolutionary stage giant[3]
Spectral type K0 IIIb[4]
B−V color index 1.058±0.003[2]
Astrometry
Radial velocity (Rv)−34.7±0.3[5] km/s
Proper motion (μ) RA: 166.374[1] mas/yr
Dec.: 167.463[1] mas/yr
Parallax (π)17.9785 ± 0.1522[1] mas
Distance181 ± 2 ly
(55.6 ± 0.5 pc)
Absolute magnitude (MV)0.97[2]
Details
Mass1.71[6] M☉
Radius10[7] R☉
Luminosity49[6] L☉
Surface gravity (log g)2.61±0.11[8] cgs
Temperature4,668±45[6] K
Metallicity [Fe/H]−0.08[3] dex
Rotational velocity (v sin i)1.0[9] km/s
Age2.27[6] Gyr
Other designations
3 And, BD+49° 4028, HD 218031, HIP 113919, HR 8780, SAO 52649, LTT 16772[10]
Database references
SIMBADdata

This is an evolved giant star with a stellar classification of K0 IIIb,[4] where the 'b' suffix indicated a lower luminosity giant. It is a red clump star,[3] which means it is generating energy through helium fusion at its core. This star has an estimated 1.7[6] times the mass of the Sun (M☉), and, at the age of 2.3[6] billion years, has expanded to 10 times the Sun's radius (R☉).[7] It is radiating 49[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,668 K.[6]

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. 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.
  3. Tautvaišienė, G.; et al. (December 2010), "C, N and O abundances in red clump stars of the Milky Way", Monthly Notices of the Royal Astronomical Society, 409 (3): 1213–1219, arXiv:1007.4064, Bibcode:2010MNRAS.409.1213T, doi:10.1111/j.1365-2966.2010.17381.x, S2CID 119182458.
  4. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  5. Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  6. 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.
  7. 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.
  8. Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40, S2CID 118675933.
  9. 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.
  10. "3 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 12, 2018.
  11. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  12. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
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