CX Canis Majoris

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CX Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major
Right ascension 07h 22m 00.9896s[1]
Declination −25° 52′ 35.912″ [1][2]
Spectral typeB5V[3]
Database references
SIMBADdata

CX CMa (CX Canis Majoris) is a blue variable star in the Canis Major constellation.[2][4] Discovery of this variable is usually credited to German Astronomer Cuno Hoffmeister in 1931, although this remains uncertain.[5]

It is an eclipsing binary of β Lyr type (semi-detached)[2] whose magnitude varies between 9.9 and 10.6 with a period of 0.95462500 day (22.911000 hour).[4] The variability was first discovered in 1931.[6] Doubts arose because of scatter in the data and the small amplitude,[7] but the discovery was confirmed by 1949.[8] Its Algol-type light curve exhibits the O'Connell effect, meaning that there is a magnitude difference between subsequent maxima.[9]

The temperature of the secondary star has been estimated at about 10,600 K and its mass at 3.4 M. The spectral type of the secondary star is estimated to be in the B8 to A0 range.[10]

References[edit]

  1. ^ a b Hog, E.; Kuzmin, A.; Bastian, U.; Fabricius, C.; Kuimov, K.; Lindegren, L.; Makarov, V. V.; Roeser, S. (1998). "The TYCHO Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
  2. ^ a b c "CX CMa". SIMBAD Astronomical Database. Strasbourg Astronomical Data Center. Retrieved 2016-09-01.
  3. ^ Williams, S. J.; Gies, D. R.; Helsel, J. W.; Matson, R. A.; Caballero-Nieves, S. (2011). "ASAS Light Curves of Intermediate-mass Eclipsing Binary Stars and the Parameters of HI Mon". The Astronomical Journal. 142: 5. arXiv:1104.3166. Bibcode:2011AJ....142....5W. doi:10.1088/0004-6256/142/1/5.
  4. ^ a b "VSX: Detail for CX CMa". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 2016-09-01.
  5. ^ Milone, E. F. (1984). "Photometry &Spectroscopy of Southern O'Connell Effect Systems VY Cru, CX CMa, TU Cru, AQ Mon, &DQ Vel". Bulletin of the American Astronomical Society. 16: 506. Bibcode:1984BAAS...16..506M.
  6. ^ Hoffmeister, C. (1931). "316 neue Veränderliche". Astronomische Nachrichten. 242 (7): 131. Bibcode:1931AN....242..129H. doi:10.1002/asna.19312420702.
  7. ^ Florya, N. (1937). "Untersuchungen von 77 veränderlichen Sternen in Monoceros, Canis major und Puppis". Trudy Gosudarstvennogo astronomicheskogo instituta im. P.K. Sternberga ; t. 8. 8: 5. Bibcode:1937TrSht...8....5F.
  8. ^ Deurinck, R. (1949). "Fourteen New Variable Stars in Canis Major, Puppis and Monoceros". Publications du Laboratoire d'Astronomie et de Geodesie de l'Universite de Louvain. 12 (1ll): E17. Bibcode:1949PLAGL..12E..17D.
  9. ^ E. F. Milone (1984). "Photometry and Spectroscopy of Southern O'Connell Effect Systems VY Cru, CX CMa, TU Cru, AQ Mon, and DQ Vel". Bulletin of the American Astronomical Society. 16: 506. Bibcode:1984BAAS...16..506M.
  10. ^ Robert H. Nelson, Dirk Terrell (30 July 2004). "CX CMa - an early type detached eclipsing binary". Information Bulletin on Variable Stars. 5545 (5545): 1. Bibcode:2004IBVS.5545....1N.