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HD 225218

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HD 225218
Observation data
Epoch J2000.0      Equinox ICRS
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 mas[2]
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 mas[4]
Distance736 ± 3 ly
(226 ± 1 pc)
Orbit[8]
PrimaryAa
NameAb
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

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  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 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, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
  4. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  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. 1 2 3 4 Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5.
  9. 1 2 3 4 5 6 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  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, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352
  11. 1 2 3 Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A.; Andrae, R.; Poggio, E.; Spitoni, E.; Contursi, G.; Zhao, H.; Oreshina-Slezak, I.; Ordenovic, C.; Bijaoui, A. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics. 669: A104. arXiv:2206.07937. Bibcode:2023A&A...669A.104K. doi:10.1051/0004-6361/202244283.
  12. ↑ Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590
  13. 1 2 Faraggiana, Rosanna; Bonifacio, Piercarlo (September 1999), "How many lambda Bootis stars are binaries?", Astronomy and Astrophysics, 349: 521–531, arXiv:astro-ph/9906009, 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, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
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