  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 04h 33m 30.68009s [1] |
| Declination | +72° 31′ 42.9803″ [1] |
| Apparent magnitude (V) | 5.93±0.01 [2] |
| Characteristics | |
| Spectral type | kA8 hF0 mF2 [3] |
| U−B color index | +0.16 [4] |
| B−V color index | +0.28 [4] |
| Astrometry | |
| Radial velocity (Rv) | 9.0±0.9 [5] km/s |
| Proper motion (μ) |
RA: +30.055
mas/
yr
[1] Dec.: −90.625 mas/ yr [1] |
| Parallax (π) | 9.8596 ± 0.0214 mas [1] |
| Distance | 330.8 ± 0.7
ly (101.4 ± 0.2 pc) |
| Absolute magnitude (MV) | +0.91 [6] |
| Orbit [7] | |
| Period (P) | 4.1950 d |
| Eccentricity (e) | 0.040±0.029 [8] |
| Inclination (i) | 28-43° |
| Periastron epoch (T) | 2,426,034.6450 JD |
|
Argument of periastron (ω) (secondary) | 337±244 [8]° |
|
Semi-amplitude (K1) (primary) | 31.3 km/s |
| Details | |
| Aa | |
| Mass | 1.68 [9] M☉ |
| Radius | 3.48±0.18 [10] R☉ |
| Luminosity | 35.7±0.2 [1] L☉ |
| Surface gravity (log g) | 3.58+0.10 −0.06 [11] cgs |
| Temperature | 7,320±157 [12] K |
| Metallicity [Fe/H] | −0.14 [13] dex |
| Rotational velocity (v sin i) | 23±10 [3] km/s |
| Age | 1.103 [14] Gyr |
| Ab | |
| Mass | 0.474 [9] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 28204, also designated as HR 1401, is a spectroscopic binary [16] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.93, [2] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 331 light-years and it is currently receding with a heliocentric radial velocity of 9 km/s. [5] At its current distance, HD 28204's brightness is diminished by 0.18 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.91. [6]
HD 28204 is a single-lined spectroscopic binary consisting of an Am star and an unseen companion, as the primary is the only one detectable in the spectrum. With a mass of 0.474 M☉, [9] the companion might be a K-type main-sequence star. Both stars take 4.2 days to revolve around each other in a nearly circular orbit, which is somewhat constrained. [7] HD 28204 has two optical companions: a 12th magnitude star located 39" away along a position angle of 257° and a 14th magnitude star located 27.3" along a position angle of 55°. [17]
The visible component has a stellar classification of kA8hF0mF2, [3] indicating that it is an Am star with the calcium K-lines of an A8 star, the hydrogen lines of a F0 star, and the metallic lines of a F2 star. It has 1.68 times the mass of the Sun [9] and an enlarged radius 3.48 times that of the Sun. [10] It radiates 35.7 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 7,320 K, [12] giving it the typical white hue of an A-type star. It is slightly metal deficient with an iron abundance of [Fe/H] = −0.15 or 72% that of the Sun's. [13] Like many Am stars it spins slowly, having a projected rotational velocity of 23 km/s. [3]
References
- ^ a b c d e f 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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ a b c d Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182. ISSN 0067-0049. S2CID 120495962.
- ^ a b Oja, T. (April 1983). "UVB photometry of FK4 and FK4 Supplement stars". Astronomy and Astrophysics Supplement Series. 52: 131–134. Bibcode: 1983A&AS...52..131O. ISSN 0365-0138.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode: 1953GCRV..C......0W. S2CID 120000732.
- ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b Luyten, W. J. (1936). "A Rediscussion of the Orbits of Seventy-Seven Spectroscopic Binaries". The Astrophysical Journal. 84. American Astronomical Society: 85. Bibcode: 1936ApJ....84...85L. doi: 10.1086/143751. ISSN 0004-637X. S2CID 121750381.
- ^ a b Lucy, L. B.; Sweeney, M. A. (August 1971). "Spectroscopic binaries with circular orbits". The Astronomical Journal. 76. American Astronomical Society: 544. Bibcode: 1971AJ.....76..544L. doi: 10.1086/111159. ISSN 0004-6256.
- ^ a b c d Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars". Bull. Inf. Centre Données Stellaires. 19: 71. Bibcode: 1980BICDS..19...71K. S2CID 118298938.
- ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180. Bibcode: 2004A&A...426..297K. doi: 10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
- ^ Stassun, Keivan G.; et al. (9 September 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. eISSN 1538-3881. hdl: 1721.1/124721. S2CID 166227927.
- ^ a b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv: 1706.02208. Bibcode: 2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711. S2CID 73594365.
- ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
- ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814. Bibcode: 2012AstL...38..771G. doi: 10.1134/S1063773712120031. S2CID 118345778.
- ^ "HD 28204". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 30, 2023.
- ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (23 August 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy & Astrophysics. 424 (2): 727–732. arXiv: astro-ph/0406573. Bibcode: 2004A&A...424..727P. doi: 10.1051/0004-6361:20041213. eISSN 1432-0746. ISSN 0004-6361. S2CID 119387088.
- ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (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. ISSN 0004-6256. S2CID 119533755.
