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
A
Spectral type B9III[5]
U−B color index 0.14[citation needed]
B−V color index 0.15[citation needed]
A
Evolutionary stage main sequence[4]
Spectral type F0V[6]
Astrometry
HD 225218 A
Radial velocity (Rv)−8.0[7] 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[8]
PrimaryAa
CompanionAb
Period (P)70.12 yr
Semi-major axis (a)0.165″
Eccentricity (e)0.515
Longitude of the node (Ω)100.6°
Periastron epoch (T)B2050.0701
Argument of periastron (ω)
(secondary)		295.1°
Details
Aa
Mass4.02[8] M☉
Radius10.6[9] R☉
Luminosity394[10] L☉
Surface gravity (log g)3.90[11] cgs
Temperature7,679[11] K
Rotation25[12]
Age1.52[11] years
Ab
Mass2.01[8] M☉
B
Mass1.34[9] M☉
Radius1.58[9] R☉
Luminosity4.10[9] L☉
Surface gravity (log g)4.17[9] cgs
Temperature6,529[9] K
Age2.75[4] Gyr
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.[13] 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.[14] Component B is has been suspected to itself be a spectroscopic binary,[13] but it is now thought that component A contains a third low-mass star.[8]

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 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 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 4.5 4.6 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.
  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. ↑ Bourgés, L.; Lafrasse, S.; Mella, G.; Chesneau, O.; Bouquin, J. L.; Duvert, G.; Chelli, A.; Delfosse, X. (2014). "The JMMC Stellar Diameters Catalog v2 (JSDC): A New Release Based on SearchCal Improvements". Astronomical Data Analysis Software and Systems Xxiii 485: 223. Bibcode: 2014ASPC..485..223B. 
  7. ↑ 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 
  8. ↑ 8.0 8.1 8.2 8.3 Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 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. 
  10. ↑ 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 
  11. ↑ 11.0 11.1 11.2 Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K. 
  12. ↑ 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 
  13. ↑ 13.0 13.1 Faraggiana, Rosanna; Bonifacio, Piercarlo (September 1999), "How many lambda Bootis stars are binaries?", Astronomy and Astrophysics 349: 521–531, Bibcode: 1999A&A...349..521F 
  14. ↑ 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 



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