Astronomy:39 Andromedae

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Short description: Double star in the constellation Andromeda
39 Andromedae
Location of 39 Andromedae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda[1]
Right ascension  01h 02m 54.25471s[2]
Declination +41° 20′ 42.7688″[2]
Apparent magnitude (V) 5.95[1]
Characteristics
Spectral type kA3hA7VmA9[3]
B−V color index +0.161±0.009[1]
Astrometry
Radial velocity (Rv)+3.1±0.9[4] km/s
Proper motion (μ) RA: −18.380[2] mas/yr
Dec.: −18.498[2] mas/yr
Parallax (π)9.5651 ± 0.1226[2] mas
Distance341 ± 4 ly
(105 ± 1 pc)
Absolute magnitude (MV)0.80[1]
Details
Mass2.01[5] M☉
Radius3.02[5] R☉
Luminosity37[5] L☉
Surface gravity (log g)3.78[5] cgs
Temperature8,203[5] K
Metallicity [Fe/H]−0.01[6] dex
Rotation30.4 days[7]
Rotational velocity (v sin i)34[8] km/s
Age670[6] Myr
Other designations
39 And, BD+40°209, HD 6116, HIP 4903, HR 290, SAO 36874, PPM 43575, WDS J01029+4121A[9]
Database references
SIMBADdata

39 Andromedae, abbreviated 39 And, is a double star in the northern constellation Andromeda. 39 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.95,[1] which indicates it is near the lower limit on visibility to the naked eye. The distance to this star, as estimated from its annual parallax shift of 9.57 mas,[2] is 341 light years. It is a suspected member of the Ursa Major Moving Group, although King et al. (2003) list it as a probable non-member.[10]

The brighter component is a confirmed Am star[11] with a stellar classification of kA3hA7VmA9.[3] This notation indicates its spectrum displays the calcium K line of an A3 star, the hydrogen lines of an A7 V, or A-type main-sequence star, and the metal lines of an A9 star. It is radiating 37 times the Sun's luminosity from its photosphere at an effective temperature of 8,203 K.[5] As of 2015, the magnitude 12.48 companion star is located at an angular separation of 20.5″ along a position angle of 3° from the primary.[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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. ↑ 3.0 3.1 Levato, H.; Abt, H. A. (August 1978), "Spectral types in the Ursa Major stream", Publications of the Astronomical Society of the Pacific 90: 429−433, doi:10.1086/130352, Bibcode: 1978PASP...90..429L. 
  4. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  6. ↑ 6.0 6.1 Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G. 
  7. ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G. et al. (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal 155 (1): 39. doi:10.3847/1538-3881/aa9bf4. Bibcode: 2018AJ....155...39O. 
  8. ↑ Monier, R. (November 2005), "Abundances of a sample of A and F-type dwarf members of the Ursa Major Group", Astronomy and Astrophysics 442 (2): 563–566, doi:10.1051/0004-6361:20053222, Bibcode: 2005A&A...442..563M. 
  9. ↑ "39 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=39+And. 
  10. ↑ King, Jeremy R. et al. (2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal 125 (4): 1980, doi:10.1086/368241, Bibcode: 2003AJ....125.1980K. 
  11. ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R. 
  12. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M 



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