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BP Circini

BP Circini is a binary star system in the southern constellation of Circinus. It is located at a distance of approximately 3,300 light years from the Sun based on parallax.[2]

The variability of this star was discovered by D. W. Kurtz in 1979.[7] A small-amplitude Cepheid variable,[8] its apparent magnitude ranges from 7.37 to 7.71 over 2.39810 days.[3] A spectroscopic binary, the primary is a yellow-white bright giant of spectral type F2 or F3II.[4] The spectrum shows peculiarities in the metallic lines.[10] The secondary is a 4.7 solar mass (M☉) blue-white main sequence star of spectral type B6.[6]

References

  1. ^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. ^ a b c d e f g h 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.
  3. ^ a b BSJ (30 November 2013). "BP Circini". AAVSO Website. American Association of Variable Star Observers. Retrieved 24 January 2014.
  4. ^ a b Skiff, B. A. (October 2014), "General Catalogue of Stellar Spectral Classifications", VizieR Online Data Catalog, Bibcode:2014yCat....1.2023S
  5. ^ 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.
  6. ^ a b c d Evans, Nancy Remage; et al. (2013). "Binary Cepheids: Separations and Mass Ratios in 5M ⊙ Binaries". Astronomical Journal. 146 (4): 93, 10 pp. arXiv:1307.7123. Bibcode:2013AJ....146...93E. doi:10.1088/0004-6256/146/4/93. S2CID 34133110.
  7. ^ a b c d Petterson, O. K. L.; et al. (May 2004). "The orbits of southern binary Cepheids". Monthly Notices of the Royal Astronomical Society. 350 (1): 95–112. Bibcode:2004MNRAS.350...95P. doi:10.1111/j.1365-2966.2004.07555.x.
  8. ^ a b c Usenko, I. A.; et al. (December 2014). "Spectroscopic studies of Cepheids in Circinus (AV Cir, BP Cir) and Triangulum Australe (R TrA, S TrA, U TrA, LR TrA)". Astronomy Letters. 40 (12): 800–820. Bibcode:2014AstL...40..800U. doi:10.1134/S1063773714110061. S2CID 122745580.
  9. ^ "V* BP Cir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 January 2014.
  10. ^ Kurtz, D. W. (1979). "HD 129708: A New, Bright, Short-Period Cepheid with an Unusual Spectrum". Monthly Notes of the Astronomical Society of Southern Africa. 38: 36. Bibcode:1979MNSSA..38...36K.