Astronomy:HD 29678

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Short description: A-type dwarf; Camelopardalis
HD 29678
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 29678 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  04h 48m 50.35317s[1]
Declination +75° 56′ 28.3916″[1]
Apparent magnitude (V) 5.95±0.01[2]
Characteristics
Evolutionary stage main sequence star[1]
Spectral type A9/F0 IV[3] or A6 V[4]
U−B color index −0.04[5]
B−V color index +0.27[5]
Astrometry
Radial velocity (Rv)−6.0±3.7[6] km/s
Proper motion (μ) RA: +37.476[1] mas/yr
Dec.: −133.853[1] mas/yr
Parallax (π)21.0142 ± 0.0265[1] mas
Distance155.2 ± 0.2 ly
(47.59 ± 0.06 pc)
Absolute magnitude (MV)+2.60[7]
Details
Mass1.54[8] M☉
Radius1.73±0.09[9] R☉
Luminosity7.54+0.04−0.06[1] L☉
Surface gravity (log g)4.20+0.09−0.07[10] cgs
Temperature7,502±255[8] K
Metallicity [Fe/H]−0.26[11] dex
Rotational velocity (v sin i)120[12] km/s
Age146[8] Myr
Other designations
BD+75°189, FK5 173, GC 5774, HD 29678, HIP 22361, HR 1491, SAO 5309, CCDM J04489+7557A, WDS J04488+7556A[13]
Database references
SIMBADdata

HD 29678, also known as HR 1491, is a solitary star[14] located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as a yellowish-white hued point of light with an apparent magnitude of 5.95.[2] The object is located relatively close at a distance of 155 light-years[1] and it is drifting closer with a somewhat constrained heliocentric radial velocity of approximately −6.0 km/s.[6] At is current distance, HD 29678's brightness is diminished by 0.13 magnitudes due to interstellar extinction and it has an absolute magnitude of +2.60.[7] Its observed kinematics suggest that it is a member of the Pleiades supercluster.[15]

HD 29678 has a stellar classification of A9/F0 IV,[3] indicating that it is a slightly evolved star that has the characteristics of an A9 and F0 subgiant. Adams et al. (1935) yields a class of A6 V,[4] indicating that it is instead a hotter A-type main-sequence star that is generating energy via hydrogen fusion at is core. It has 1.54 times the mass of the Sun[8] and 1.73 times the radius of the Sun.[9] It radiates 7.54 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,502 K.[8] The above characteristics more closely match a main sequence star and Gaia DR3 models the object as such.[1] HD 29678 is metal-deficient with an iron abundance of [Fe/H] = −0.26 or 55% of the Sun's[11] and it is estimated to be 146 million years old.[8] Like many hot stars it spins rapidly, having a projected rotational velocity of 120 km/s.[12]

HD 29678 has a 13th magnitude optical companion located 98.6" away along a position angle of 46°.[16] HD 29678 itself is an unrelated field star of the HIP 21974 cluster.[17]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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 Cowley, A. P. (April 1976). "Spectral classification of the bright F stars.". Publications of the Astronomical Society of the Pacific 88: 95. doi:10.1086/129905. ISSN 0004-6280. Bibcode: 1976PASP...88...95C. 
  4. ↑ 4.0 4.1 Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal 81: 187. doi:10.1086/143628. ISSN 0004-637X. Bibcode: 1935ApJ....81..187A. 
  5. ↑ 5.0 5.1 Imagawa, Fumihiko (February 1967). "Observational Results of Three-color Photometry for F-type Stars (II)" (in en). Memoirs of the College of Science, University of Kyoto. Series A 31 (2): 93–100. https://cir.nii.ac.jp/crid/1050849378475608960. 
  6. ↑ 6.0 6.1 Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889–896. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K. 
  7. ↑ 7.0 7.1 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. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. 
  9. ↑ 9.0 9.1 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. 
  10. ↑ 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. 
  11. ↑ 11.0 11.1 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. 
  12. ↑ 12.0 12.1 Danziger, I. J.; Faber, S. M. (May 1972). "Rotation of evolving A and F stars.". Astronomy and Astrophysics 18: 428. ISSN 0004-6361. Bibcode: 1972A&A....18..428D. 
  13. ↑ "HD 29678". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+29678. 
  14. ↑ De Rosa, R. J. et al. (26 November 2013). "The VAST Survey – III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society 437 (2): 1216–1240. doi:10.1093/mnras/stt1932. ISSN 0035-8711. Bibcode: 2014MNRAS.437.1216D. 
  15. ↑ Eggen, Olin J. (April 1992). "The Pleiades supercluster in FK 5". The Astronomical Journal (American Astronomical Society) 103: 1302. doi:10.1086/116142. ISSN 0004-6256. Bibcode: 1992AJ....103.1302E. 
  16. ↑ 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. 
  17. ↑ Cantat-Gaudin, T.; Jordi, C.; Vallenari, A.; Bragaglia, A.; Balaguer-Núñez, L.; Soubiran, C.; Bossini, D.; Moitinho, A. et al. (October 2018). "A Gaia DR2 view of the open cluster population in the Milky Way". Astronomy & Astrophysics 618: A93. doi:10.1051/0004-6361/201833476. ISSN 0004-6361. Bibcode: 2018A&A...618A..93C. 



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