Astronomy:HD 26764

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Short description: Star in the constellation Camelopardalis
HD 26764
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 26764 on the map (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: −0.218[1] mas/yr
Parallax (π)12.2443 ± 0.1844[1] mas
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] BD+53°750, FK5 2310, GC 5132, HD 26764, HIP 19949, HR 1314, SAO 24512[16]
Database references
SIMBADdata

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 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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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. ↑ 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 3.4 3.5 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 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. doi:10.1086/110819. ISSN 0004-6256. Bibcode: 1969AJ.....74..375C. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ Häggkvist, L.; Oja, T. (1966). "Photoelectric photometry of bright stars". Arkiv för Astronomi 4: 137–163. ISSN 0004-2048. Bibcode: 1966ArA.....4..137H. 
  7. ↑ 7.0 7.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  8. ↑ 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. 
  9. ↑ 9.0 9.1 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. 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 11.2 11.3 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. 
  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. doi:10.1051/0004-6361/201528052. ISSN 0004-6361. Bibcode: 2016A&A...589A..83G. 
  13. ↑ 13.0 13.1 Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars.". The Astrophysical Journal 118: 285. doi:10.1086/145751. ISSN 0004-637X. Bibcode: 1953ApJ...118..285H. 
  14. ↑ 14.0 14.1 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. doi:10.1051/0004-6361/201014003. ISSN 0004-6361. Bibcode: 2010A&A...516A..29V. 
  16. ↑ "HD 26764". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+26764. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  19. ↑ Schröder, C.; Schmitt, J. H. M. M. (24 September 2007). "X-ray emission from A-type stars". Astronomy & Astrophysics 475 (2): 677–684. doi:10.1051/0004-6361:20077429. ISSN 0004-6361. Bibcode: 2007A&A...475..677S. 



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