Astronomy:45 Andromedae

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Short description: Double star in the constellation Andromeda
45 Andromedae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  01h 02m 54.25356s[1]
Declination +41° 20′ 42.7673″[1]
Apparent magnitude (V) 5.80[2]
Characteristics
Spectral type B7 III-IV[3]
B−V color index −0.095±0.004[2]
Astrometry
Radial velocity (Rv)−1.5±1.0[4] km/s
Proper motion (μ) RA: −17.558[1] mas/yr
Dec.: −18.400[1] mas/yr
Parallax (π)9.5725 ± 0.0805[1] mas
Distance341 ± 3 ly
(104.5 ± 0.9 pc)
Absolute magnitude (MV)−1.10[2]
Details
Radius5.2[5] R☉
Luminosity413.92[2] L☉
Temperature12,874±167[6] K
Rotational velocity (v sin i)60[7] km/s
Other designations
45 And, BD+36° 201, HD 7019, HIP 5550, HR 348, SAO 54494, PPM 66038, WDS J01112+3743AB[8]
Database references
SIMBADdata

45 Andromedae, abbreviated 45 And, is a double star[9] in the northern constellation Andromeda. 45 Andromedae is the Flamsteed designation. Its combined apparent visual magnitude is 5.80.[2] Based upon an annual parallax shift of 9.57 mas,[1] it is located 341 light years away.

The stellar classification of 45 And is B7 III-IV,[3] matching an evolving subgiant/giant star. It has about 5.2[5] times the Sun's radius and is radiating 414[2] times the Sun's luminosity from its photosphere at an effective temperature of 12,874 K.[6]

This star is most likely single. A companion star was discovered by American astronomer George W. Hough in 1890. As of 2006, the companion was at an angular separation of 0.10″ along a position angle of 225° from the primary.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal 77: 750–755, doi:10.1086/111348, Bibcode: 1972AJ.....77..750C. 
  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 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  6. ↑ 6.0 6.1 Soubiran, Caroline et al. (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics 591: A118, doi:10.1051/0004-6361/201628497, Bibcode: 2016A&A...591A.118S. 
  7. ↑ Strom, Stephen E. et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal 129 (2): 809–828, doi:10.1086/426748, Bibcode: 2005AJ....129..809S. 
  8. ↑ "45 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=45+And. 
  9. ↑ 9.0 9.1 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 

External links



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