Astronomy:HD 28204

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Short description: Spectroscopic binary in the constellation Camelopardalis
HD 28204
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 28204 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: −90.625[1] mas/yr
Parallax (π)9.8596 ± 0.0214[1] mas
Distance330.8 ± 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
Mass1.68[9] M☉
Radius3.48±0.18[10] R☉
Luminosity35.7±0.2[1] L☉
Surface gravity (log g)3.58+0.10−0.06[11] cgs
Temperature7,320±157[12] K
Metallicity [Fe/H]−0.14[13] dex
Rotational velocity (v sin i)23±10[3] km/s
Age1.103[14] Gyr
Ab
Mass0.474[9] M☉
Other designations
BD+72°227A, FK5 2333, GC 5478, HD 28204, HIP 21247, HR 1401, SAO 5238, ADS 3267 A, CCDM J04335+7232A, WDS J04335+7232A[15]
Database references
SIMBADdata

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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 3.2 3.3 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. doi:10.1086/192182. ISSN 0067-0049. Bibcode: 1995ApJS...99..135A. 
  4. ↑ 4.0 4.1 Oja, T. (April 1983). "UVB photometry of FK4 and FK4 Supplement stars.". Astronomy and Astrophysics Supplement Series 52: 131–134. ISSN 0365-0138. Bibcode: 1983A&AS...52..131O. 
  5. ↑ 5.0 5.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities.". Carnegie Institute Washington D.C. Publication: 0. Bibcode: 1953GCRV..C......0W. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 Luyten, W. J. (1936). "A Rediscussion of the Orbits of Seventy-Seven Spectroscopic Binaries". The Astrophysical Journal (American Astronomical Society) 84: 85. doi:10.1086/143751. ISSN 0004-637X. Bibcode: 1936ApJ....84...85L. 
  8. ↑ 8.0 8.1 Lucy, L. B.; Sweeney, M. A. (August 1971). "Spectroscopic binaries with circular orbits.". The Astronomical Journal (American Astronomical Society) 76: 544. doi:10.1086/111159. ISSN 0004-6256. Bibcode: 1971AJ.....76..544L. 
  9. ↑ 9.0 9.1 9.2 9.3 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. 
  10. ↑ 10.0 10.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  11. ↑ Stassun, Keivan G. et al. (9 September 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. 
  12. ↑ 12.0 12.1 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. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. 
  13. ↑ 13.0 13.1 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  14. ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G. 
  15. ↑ "HD 28204". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+28204. 
  16. ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G. et al. (23 August 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy & Astrophysics 424 (2): 727–732. doi:10.1051/0004-6361:20041213. ISSN 0004-6361. Bibcode: 2004A&A...424..727P. 
  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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 



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