Astronomy:45 Andromedae

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Short description: Double star in the constellation Andromeda
45 Andromedae
Location of 45 Andromedae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda[1]
Right ascension  01h 11m 10.2771s[2]
Declination +37° 43′ 26.848″[2]
Apparent magnitude (V) 5.80[1]
Characteristics
Evolutionary stage main sequence[2]
Spectral type B7 III-IV[3]
B−V color index −0.095±0.004[1]
Astrometry
Radial velocity (Rv)−1.5±1.0[4] km/s
Proper motion (μ) RA: −15.844[2] mas/yr
Dec.: −5.486[2] mas/yr
Parallax (π)4.9479 ± 0.0555[2] mas
Distance659 ± 7 ly
(202 ± 2 pc)
Absolute magnitude (MV)−1.10[1]
Details
Mass3.30[5] M☉
Radius4.24[6] R☉
Luminosity156[5] L☉
Surface gravity (log g)3.93[7] cgs
Temperature12,078[5] K
Metallicity [Fe/H]−0.47[7] dex
Rotational velocity (v sin i)60[8] km/s
Other designations
45 And, BD+36°201, HD 7019, HIP 5550, HR 348, SAO 54494, PPM 66038, WDS J01112+3743AB[9]
Database references
SIMBADdata

45 Andromedae, abbreviated 45 And, is a double star[10] in the northern constellation Andromeda. 45 Andromedae is the Flamsteed designation. Its combined apparent visual magnitude is 5.80.[1] Based upon an annual parallax shift of 4.95 mas,[2] it is located 659 light years away.

The stellar classification of 45 And is B7 III-IV,[3] matching an evolving subgiant/giant star. It has about 4.2 times the Sun's radius[6] and is radiating 156 times the Sun's luminosity from its photosphere at an effective temperature of 12,078 K.[5]

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.[10]

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 2.6 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 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 5.2 5.3 Quintana, Alexis L.; Wright, Nicholas J.; Martínez García, Juan (2025). "A census of OB stars within 1 KPC and the star formation and core collapse supernova rates of the Milky Way". Monthly Notices of the Royal Astronomical Society 538 (3): 1367. doi:10.1093/mnras/staf083. Bibcode: 2025MNRAS.538.1367Q. 
  6. ↑ 6.0 6.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs". Astronomy and Astrophysics 657. doi:10.1051/0004-6361/202142146. Bibcode: 2022A&A...657A...7K. 
  7. ↑ 7.0 7.1 Das, Pradosh Barun; Zucker, Daniel B.; De Silva, Gayandhi M.; Borsato, Nicholas W.; Mura-Guzmán, Aldo; Buder, Sven; Ness, Melissa; Nordlander, Thomas et al. (2025). "The GALAH Survey: Stellar parameters and abundances for 800 000 Gaia RVS spectra using GALAH DR4 and the Cannon". Monthly Notices of the Royal Astronomical Society 538 (2): 605. doi:10.1093/mnras/staf169. Bibcode: 2025MNRAS.538..605D. 
  8. ↑ 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. 
  9. ↑ "45 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=45+And. 
  10. ↑ 10.0 10.1 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. 



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