HD 40873

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HD 40873
Auriga constellation map.svg
Red circle.svg
Location of HD 40873 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  06h 04m 29.11992s[1]
Declination +51° 34′ 24.1921″[1]
Apparent magnitude (V) 6.45[2]
Spectral type A7 V[3] or A7 III[4]
U−B color index +0.16[2]
B−V color index +0.196±0.007[5]
Radial velocity (Rv)19.6±2.9[5] km/s
Proper motion (μ) RA: +1.850[1] mas/yr
Dec.: −41.692[1] mas/yr
Parallax (π)7.1678 ± 0.0962[1] mas
Distance455 ± 6 ly
(140 ± 2 pc)
Absolute magnitude (MV)0.76[5]
Luminosity38[6] L
Temperature7,753[6] K
Rotational velocity (v sin i)134[7] km/s
Other designations
35 Camelopardalis, NSV 2804, BD+51°1146, FK5 2463, HD 40873, HIP 28765, HR 2123, SAO 25548
Database references

HD 40873 is a star in the northern constellation of Auriga, a few degrees to the south of Delta Aurigae. Located around 455 light-years distant,[1] it shines with a luminosity approximately 38 times that of the Sun and has an effective temperature of 7,753 K,[6] it is a suspected variable star[2] and has a fairly rapid rotation rate, showing a projected rotational velocity of 134 km/s.[7] Eggen (1985) suggested it is a probable member of the Hyades Supercluster.[8]

Samuel Molyneux named this star Telescopica in Auriga.[9] Flamsteed catalogued it as 35 Camelopardali Heveliana, which is the name James Bradley continued to use, although it is within the borders of the modern constellation Auriga.[10] Francis Baily reclassified it to Auriga as star 1924 in the British Association's 1845 Catalogue of 8377 Stars.[11]

HD 40873 is considered to be an Am star, a chemically peculiar star with unusually strong absorption lines of metals,[12] it has been given a spectral type of kA5mA7IV,[13] although other catalogues have given more normal classifications such as A7 V or A7 III.[3][4]


HD 40873 has a 9th magnitude class A5 companion about half an arc-minute away, it is designated as SAO 25549.[14] The companion is itself a pair of stars, each of similar brightness, separated by 0.6".[15]


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c Danziger, I. J.; Dickens, R. J. (July 1967). "Spectrophotometry of New Short-Period Variable Stars". Astrophysical Journal. 149: 55. Bibcode:1967ApJ...149...55D. doi:10.1086/149231.
  3. ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. ^ a b Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
  5. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  6. ^ a b c McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  7. ^ a b Royer, F.; et al. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics. 393 (3): 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943.
  8. ^ Eggen, O. J. (June 1985). "A systematic search for members of the Hyades Supercluster. IV - The metallic-line stars and ultrashort-period Cepheids". Astronomical Journal. 90: 1046−1059. Bibcode:1985AJ.....90.1046E. doi:10.1086/113812.
  9. ^ Bradley, James; Rigaud, Stephen Peter (1832). Miscellaneous works and correspondence of the Rev. James Bradley, D.D., F.R.S. Oxford University Press. p. 212.
  10. ^ Wagman, M. (1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 209–223. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305.
  11. ^ British Association for the Advancement of Science; Francis Baily (1845). The Catalogue of Stars of the British Association for the Advancement of Science: Containing the Mean Right Ascensions and North Polar Distances of Eight Thousand Three Hundred and Seventy-seven Fixed Stars, Reduced to January 1, 1850: Together with Their Annual Precessions, Secular Variations and Proper Motions, as Well as the Logarithmic Constants for Computing Precession, Aberration and Nutation. With a Preface Explanatory of Their Construction and Application. R. and J. E. Taylor. pp. 2–.
  12. ^ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  13. ^ Gray, R. O.; Garrison, R. F. (1989). "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". The Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
  14. ^ "CCDM J06045+5135BC". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 February 2018.
  15. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I; the Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.