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HD 26764

Summary

HD 26764, also known as HR 1314 or rarely 14 H. Camelopardalis, is a solitary white hued star[17] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.19, making it faintly to the naked eye if viewed under good conditions. Gaia DR3 parallax measurements place the object at a distance of 266 light years[1] and is drifting closer with a poorly constrained heliocentric radial velocity of 3 km/s.[7] At its current distance, HD 26764's brightness is diminished by 0.26 magnitudes due to interstellar dust.[18]

HD 26764
Location of HD 26764 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Camelopardalis
Right ascension 04h 16m 43.0917s[1]
Declination +53° 36′ 42.4808″[1]
Apparent magnitude (V) 5.19±0.01[2]
Characteristics
Evolutionary stage main sequence star[3]
Spectral type A2 Vn[4] or A1 Vn[5]
B−V color index +0.05[6]
Astrometry
Radial velocity (Rv)−3.0±3.1[7] km/s
Proper motion (μ) RA: −17.700 mas/yr[1]
Dec.: −0.218 mas/yr[1]
Parallax (π)12.2443 ± 0.1844 mas[1]
Distance266 ± 4 ly
(82 ± 1 pc)
Absolute magnitude (MV)+0.21[8]
Details
Mass2.74±0.08[3] M☉
Radius3.38±0.17[9] R☉
Luminosity94.1+13.7
−12[3] L☉
Surface gravity (log g)3.79±0.07[10] cgs
Temperature9,825±334[11] K
Metallicity [Fe/H]−0.70[12] dex
Rotational velocity (v sin i)205[13][14] km/s
Age388[11] Myr
Other designations
14 H. Camelopardalis,[15] AG+53°373, BD+53°750, FK5 2310, GC 5132, HD 26764, HIP 19949, HR 1314, SAO 24512[16]
Database references
SIMBADdata

HD 26764 has a stellar classification of either A2 Vn or A1 Vn.[4][5] Both classes indicate that the object is an A-type main-sequence star with broad (nebulous) absorption lines due to rapid rotation. At present it has 2.74 times the mass of the Sun[3] and 3.4 times the Sun's radius.[9] It radiates 94 times the luminosity of the Sun[3] from its photosphere at an effective temperature of 9,825 K.[11] At the age of 388 million years,[11] HD 26764 is a rather evolved dwarf star, having completed 91.2% of its main sequence lifetime.[3] Like many hot stars, it spins rapidly with a projected rotational velocity of 205 km/s.[13][14] An X-ray emission with a luminosity of 498.5×1020 W has been detected around the star. A-type stars are not expected to produce X-rays, so it must be coming from an unseen companion.[19]

References edit

  1. ^ a b c d e 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. ^ 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.
  3. ^ a b c d e f Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. eISSN 1432-0746. ISSN 0004-6361. S2CID 55586789.
  4. ^ a b Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi:10.1086/110819. ISSN 0004-6256.
  5. ^ a b 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.
  6. ^ Häggkvist, L.; Oja, T. (1966). "Photoelectric photometry of bright stars". Arkiv för Astronomi. 4: 137–163. Bibcode:1966ArA.....4..137H. ISSN 0004-2048.
  7. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  8. ^ 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.
  9. ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". 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.
  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 c d 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.
  12. ^ Gebran, M.; Farah, W.; Paletou, F.; Monier, R.; Watson, V. (18 April 2016). "A new method for the inversion of atmospheric parameters of A/Am stars". Astronomy & Astrophysics. 589: A83. arXiv:1603.01146. Bibcode:2016A&A...589A..83G. doi:10.1051/0004-6361/201528052. eISSN 1432-0746. ISSN 0004-6361.
  13. ^ a b Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode:1953ApJ...118..285H. doi:10.1086/145751. eISSN 1538-4357. ISSN 0004-637X.
  14. ^ a b Palmer, D. R.; Walker, E. N.; Jones, D. H. P.; Wallis, R. E. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars". Royal Greenwich Observatory Bulletins. 135: 385. Bibcode:1968RGOB..135..385P.
  15. ^ Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics. 516: A29. Bibcode:2010A&A...516A..29V. doi:10.1051/0004-6361/201014003. eISSN 1432-0746. ISSN 0004-6361.
  16. ^ "HD 26764". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 13, 2022.
  17. ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711.
  18. ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711.
  19. ^ Schröder, C.; Schmitt, J. H. M. M. (24 September 2007). "X-ray emission from A-type stars". Astronomy & Astrophysics. 475 (2): 677–684. Bibcode:2007A&A...475..677S. doi:10.1051/0004-6361:20077429. eISSN 1432-0746. ISSN 0004-6361.

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