HD 225218
| Observation data Epoch J2000.0 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 |
| B−V color index | 0.15 |
| 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] |
| Distance | approx. 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] |
| Distance | 736 ± 3 ly (226 ± 1 pc) |
| Orbit[8] | |
| Primary | Aa |
| Name | Ab |
| 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 | |
| Mass | 4.02[8] M☉ |
| Radius | 10.6[9] R☉ |
| Luminosity | 394[10] L☉ |
| Surface gravity (log g) | 3.90[11] cgs |
| Temperature | 7,679[11] K |
| Rotation | 25[12] |
| Age | 1.52[11] years |
| Ab | |
| Mass | 2.01[8] M☉ |
| B | |
| Mass | 1.34[9] M☉ |
| Radius | 1.58[9] R☉ |
| Luminosity | 4.10[9] L☉ |
| Surface gravity (log g) | 4.17[9] cgs |
| Temperature | 6,529[9] K |
| Age | 2.75[4] Gyr |
| Other designations | |
| BD+41 4933, HD 225218, HIP 365, HR 9105, NSV 15012, SAO 36037, WDS J00046+4206 | |
| Database references | |
| SIMBAD | A |
| 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
- ^ 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.
- ^ a b c d e 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.
- ^ a b c d 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
- ^ a b c d e f g 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.
- ^ a b 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
- ^ 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.
- ^ 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
- ^ a b c d 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.
- ^ a b c d e f 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.
- ^ 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
- ^ a b c 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.
- ^ 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
- ^ a b 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
- ^ 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