Jump to content

HD 29678

Edit links
From Wikipedia, the free encyclopedia
HD 29678
Location of HD 29678 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1]
Dec.: −133.853 mas/yr[1]
Parallax (π)21.0142 ± 0.0265 mas[1]
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
AG+75°168, BD+75°189, FK5 173, GC 5774, HD 29678, HIP 22361, HR 1491, SAO 5309, CCDM J04489+7557A, WDS J04488+7556A, TIC 140682376[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[edit]

  1. ^ a b c d e f g h i 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.
  2. ^ 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.
  3. ^ a b Cowley, A. P. (April 1976). "Spectral classification of the bright F stars". Publications of the Astronomical Society of the Pacific. 88: 95. Bibcode:1976PASP...88...95C. doi:10.1086/129905. eISSN 1538-3873. ISSN 0004-6280.
  4. ^ a b 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. Bibcode:1935ApJ....81..187A. doi:10.1086/143628. eISSN 1538-4357. ISSN 0004-637X. S2CID 121056016.
  5. ^ a b Imagawa, Fumihiko (February 1967). "Observational Results of Three-color Photometry for F-type Stars (II)". Memoirs of the College of Science, University of Kyoto. Series A. 31 (2): 93–100.
  6. ^ a b 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. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. eISSN 1521-3994. ISSN 0004-6337. S2CID 119323941.
  7. ^ 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.
  8. ^ a b c d e f 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. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357. S2CID 33401607.
  9. ^ 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.
  10. ^ 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.
  11. ^ 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.
  12. ^ a b Danziger, I. J.; Faber, S. M. (May 1972). "Rotation of evolving A and F stars". Astronomy and Astrophysics. 18: 428. Bibcode:1972A&A....18..428D. ISSN 0004-6361. S2CID 118592077.
  13. ^ "HD 29678". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 13, 2023.
  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. arXiv:1311.7141. Bibcode:2014MNRAS.437.1216D. doi:10.1093/mnras/stt1932. eISSN 1365-2966. ISSN 0035-8711. S2CID 88503488.
  15. ^ Eggen, Olin J. (April 1992). "The Pleiades supercluster in FK 5". The Astronomical Journal. 103. American Astronomical Society: 1302. Bibcode:1992AJ....103.1302E. doi:10.1086/116142. ISSN 0004-6256. S2CID 120439628.
  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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256. S2CID 119533755.
  17. ^ Cantat-Gaudin, T.; Jordi, C.; Vallenari, A.; Bragaglia, A.; Balaguer-Núñez, L.; Soubiran, C.; Bossini, D.; Moitinho, A.; Castro-Ginard, A.; Krone-Martins, A.; Casamiquela, L.; Sordo, R.; Carrera, R. (October 2018). "A Gaia DR2 view of the open cluster population in the Milky Way". Astronomy & Astrophysics. 618: A93. arXiv:1805.08726. Bibcode:2018A&A...618A..93C. doi:10.1051/0004-6361/201833476. ISSN 0004-6361. S2CID 56245426.
Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_29678&oldid=1186391003"