HD 28204

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HD 28204
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 28204 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 04h 33m 30.68009s [2]
Declination +72° 31′ 42.9803″ [2]
Apparent magnitude  (V)5.93±0.01 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type kA8 hF0 mF2 [4]
U−B color index +0.16 [5]
B−V color index +0.28 [5]
Astrometry
Radial velocity (Rv)9.0±0.9 [6] km/s
Proper motion (μ)RA: +30.055 mas/yr [2]
Dec.: −90.625 mas/yr [2]
Parallax (π)9.8596±0.0214  mas [2]
Distance 330.8 ± 0.7  ly
(101.4 ± 0.2  pc)
Absolute magnitude  (MV)+0.91 [1]
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 [2]   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 [4]  km/s
Age 1.103 [14]   Gyr
Ab
Mass 0.474 [9]   M☉
Other designations
AG+72°116, BD+72°227A, FK5 2333, GC 5478, HD 28204, HIP 21247, HR 1401, SAO 5238, ADS 3267 A, CCDM J04335+7232A, WDS J04335+7232A, TIC 103566595 [15]
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, [3] 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 . [6] 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. [1]

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, [4] 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 [2] 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 . [4]

References

  1. 1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 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 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.
  4. 1 2 3 4 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.
  5. 1 2 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.
  6. 1 2 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W. S2CID   120000732.
  7. 1 2 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.
  8. 1 2 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.
  9. 1 2 3 4 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.
  10. 1 2 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.
  11. ↑ 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.
  12. 1 2 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.
  13. 1 2 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.
  14. ↑ 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.
  15. ↑ "HD 28204". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved September 30, 2023.
  16. ↑ 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.
  17. ↑ 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.
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