Astronomy:HD 225218

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Short description: Quadruple star system in the constellation of Andromeda
HD 225218
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Andromeda[1]
HD 225218 A
Right ascension  00h 04m 36.58441s[2]
Declination +42° 05′ 33.0865″[2]
Apparent magnitude (V) 6.16[3]
HD 225218 B
Right ascension  00h 04m 36.67195s[4]
Declination +42° 05′ 27.8497″[4]
Apparent magnitude (V) 9.65[3]
Characteristics
Spectral type B9III[5] + F0V:
U−B color index 0.14
B−V color index 0.15
Astrometry
HD 225218 A
Radial velocity (Rv)−8.0[6] km/s
Proper motion (μ) RA: −10.367±0.266[2] mas/yr
Dec.: −14.491±0.222[2] mas/yr
Parallax (π)3.0041 ± 0.3539[2] mas
Distanceapprox. 1,100 ly
(approx. 330 pc)
HD 225218 B
Proper motion (μ) RA: −12.314±0.015[4] mas/yr
Dec.: −16.129±0.015[4] mas/yr
Parallax (π)4.4324 ± 0.0208[4] mas
Distance736 ± 3 ly
(226 ± 1 pc)
Orbit[7]
Period (P)70.12 yr
Semi-major axis (a)0.165″
Eccentricity (e)0.515
Details
Luminosity394[8] L☉
Temperature7,611[8] K
Rotation25[9]
Other designations
BD+41 4933, HD 225218, HIP 365, HR 9105, NSV 15012, SAO 36037, WDS J00046+4206
Database references
SIMBADA
B

HD 225218 is a quadruple star system in the northern constellation of Andromeda. The primary component, HD 225218 A, is a giant star with a stellar classification of B9III,[5] an apparent magnitude of 6.16,[3] and is a candidate Lambda Boötis star.[10] It has a fainter, magnitude 9.65 companion, HD 225218 B, at an angular separation of 5.2″ along a position angle of 171°.[3] The primary itself has been identified as a binary star system through interferometry, with the two components separated by 0.165″. The pair, HD 225218 Aa and Ab, orbit each other with a period of about 70 years and an eccentricity of 0.515.[7] Component B is likewise a spectroscopic binary.[10]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 Mason, Brian D. et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  5. ↑ 5.0 5.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C 
  6. ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W 
  7. ↑ 7.0 7.1 Malkov, O. Yu. et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics 546: 5, doi:10.1051/0004-6361/201219774, A69, Bibcode: 2012A&A...546A..69M 
  8. ↑ 8.0 8.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M 
  9. ↑ Abt, Helmut A. et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A 
  10. ↑ 10.0 10.1 Faraggiana, Rosanna; Bonifacio, Piercarlo (September 1999), "How many lambda Bootis stars are binaries?", Astronomy and Astrophysics 349: 521–531, Bibcode: 1999A&A...349..521F 



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