11 Andromedae

11 Andromedae, abbreviated 11 And, is a single,[10] orange-hued star in the northern constellation of Andromeda. 11 Andromedae is the Flamsteed designation. It has an apparent visual magnitude of 5.44,[2] which is bright enough to be faintly visible to the naked eye. An annual parallax shift of 11.5 mas[1] yields a distance estimate of 283 light years. It is moving further from the Earth with a heliocentric radial velocity of +10 km/s.[1]

Not to be confused with Xi Andromedae or Andromeda II. For the galaxy Andromeda XI (Andromeda 11), see Andromeda XI.
11 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 19m 29.80701s[1]
Declination +48° 37′ 31.1615″[1]
Apparent magnitude (V) 5.44[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.82[4]
B−V color index +1.014±0.003[2]
Astrometry
Radial velocity (Rv)+9.99±0.14[1] km/s
Proper motion (μ) RA: +22.597[1] mas/yr
Dec.: +52.689[1] mas/yr
Parallax (π)11.5097 ± 0.0858[1] mas
Distance283 ± 2 ly
(86.9 ± 0.6 pc)
Absolute magnitude (MV)0.73[2]
Details
Mass2.57[5] M☉
Radius12[6] R☉
Luminosity62.86[2] L☉
Surface gravity (log g)2.61[5] cgs
Temperature4,874[5] K
Metallicity [Fe/H]−0.13±0.07[7] dex
Rotational velocity (v sin i)1.0[8] km/s
Other designations
11 And, BD+47° 4110, GC 32476, HD 219945, HIP 115152, HR 8874, SAO 52907, PPM 64074[9]
Database references
SIMBADdata

This is an evolved giant star with a stellar classification of K0 III,[3] which means it has exhausted the supply of hydrogen at its core and turned off the main sequence. It has an estimated 2.57[5] times the mass of the Sun and has expanded to around 12[6] times the Sun's radius. It is radiating 63[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,874 km/s.[5]

Within Andromeda it is the south-west end of a bright northerly chain (jagged line) asterism – the others being, their order going with numbering, 8, 7, 5 and 3 Andromedae.

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. Griffin, R. F.; Redman, R. O. (1960), "Photoelectric measurements of the lambda 4200 A CN band and the G band in G8-K5 spectra", Monthly Notices of the Royal Astronomical Society, 120: 287, Bibcode:1960MNRAS.120..287G, doi:10.1093/mnras/120.4.287.
  4. Hoffleit, D.; Warren Jr., W. H., "HR 8874, database entry", The Bright Star Catalogue (5th Revised (Preliminary Version) ed.), CDS. ID V/50. Accessed on line August 21, 2008.
  5. Liu, Y. J.; et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal, 785 (2): 12, arXiv:1404.1687, Bibcode:2014ApJ...785...94L, doi:10.1088/0004-637X/785/2/94, S2CID 119226316, 94.
  6. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754
  7. Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171, S2CID 119241004.
  8. 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.
  9. "11 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 18, 2018.
  10. 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.
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