Star in the constellation Auriga
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 Camelopardalis 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]
^ 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 .
^ 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 .
^ 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 .
^ 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 .
^ 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 . S2CID 119257644 .
^ 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 . S2CID 118665352 .
^ 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 . S2CID 14070763 .
^ 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 .
^ 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.
^ 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 . S2CID 118445625 .
^ 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 –.
^ 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 .
^ 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 .
^ "CCDM J06045+5135BC" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 8 February 2018 .
^ 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 .