This article is about a Puppis. For A Puppis, see HD 54893.

HD 64440, also known as a Puppis, is a binary star in the constellation Puppis. At a moderate brightness of 3.71, it is visible to the naked eye.[1] Parallax measurements give a distance of 108 parsecs (350 light-years).[2]

This is a spectroscopic binary of the single-lined type, meaning the spectral lines of only a component can be seen in the spectrum.[3] The primary has a spectral type of K1.5II,[4] which at first would make it a bright giant star, but this classification is unsupported by its relatively small absolute magnitude.[3] The secondary is an early A-type star.[4] They orbit with a period of about 6.13 years and have a high eccentricity of 0.667.[3]

References

  1. ^ 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 Vizier catalog entry
  2. ^ Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600 Vizier catalog entry
  3. ^ Anguita-Aguero, Jennifer; Mendez, Rene A.; Videla, Miguel; Costa, Edgardo; Vanzi, Leonardo; Castro-Morales, Nicolas; Caballero-Valdes, Camila (September 2023). "Mass Ratio of Single-line Spectroscopic Binaries with Visual Orbits Using Bayesian Inference and Suitable Priors". The Astronomical Journal. 166 (4): 172. arXiv:2309.06394. Bibcode:2023AJ....166..172A. doi:10.3847/1538-3881/acf297. ISSN 1538-3881
  4. ^ Eggleton, P. P. & Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976