V Puppis

V Puppis (V Pup) is a star system in the constellation Puppis. Its apparent magnitude is 4.41.[2] There is a binary star system at the center with a B1 dwarf orbiting a B3 subgiant star.[4] They have an orbital period of 1.45 days and a distance of only 15 solar radii apart.[3] However, the system moves back and forth, indicating that there is a massive object orbiting them with a period around 5.47 years. Based on the mass of the object, its lack of a visible spectrum, and circumstellar matter in the system with many heavy elements (as would be produced by a past supernova in the system), it is probably a black hole.[9][10] However, a follow-up study could not confirm this object, but found signs that there may be a third object which is fainter than the other components.[11]

A light curve for V Puppis, plotted from TESS data[12]
V Puppis
Location of V Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 58m 14.43920s[1]
Declination −49° 14′ 41.6803″[1]
Apparent magnitude (V) 4.41[2]
(5.10 + 5.59)[3]
Characteristics
Spectral type B1Vp + B3IV:[4]
U−B color index −0.96[2]
B−V color index −0.17[2]
Variable type β Lyr[5]
Astrometry
Radial velocity (Rv)+19.40[6] km/s
Proper motion (μ) RA: -5.34[1] mas/yr
Dec.: +7.12[1] mas/yr
Parallax (π)3.40 ± 0.29 mas[1]
Distance960 ± 80 ly
(290 ± 30 pc)
Absolute magnitude (MV)−3.56[7]
Orbit[3]
PrimaryV Pup Aa
CompanionV Pup Ab
Period (P)1.4544859 d
Semi-major axis (a)14.96±0.2 R☉
Details
V Pup Aa
Mass14.0[3] M☉
Radius5.48[3] R☉
Luminosity12,600[3] L☉
Temperature26,000[3] K
Rotational velocity (v sin i)275.0[8] km/s
V Pup Ab
Mass7.3[3] M☉
Radius4.59[3] R☉
Luminosity6,500[3] L☉
Temperature24,000[3] K
Age5[3] Myr
Other designations
CD-48°3349, CCDM J07582-4915A, GC 10802, GSC 08143-03239, HIP 38957, HR 3129, HD 65818, SAO 219226, WDS J07582-4915A
Database references
SIMBADdata

In addition to the main system, more distant components have been reported: B, at magnitude 11.5 and separation 6.2", C, at magnitude 13.2 and separation 18.9", D, at magnitude 9.88 and separation 39", and E, at magnitude 13 and separation from D of 10.4".[13]

References
  1. 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
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Budding, E.; Love, T.; Blackford, M. G.; Banks, T.; Rhodes, M. J. (2021). "Absolute Parameters of Young Stars: V Puppis". Monthly Notices of the Royal Astronomical Society. 502 (4): 6032–6043. arXiv:2102.00362. doi:10.1093/mnras/stab381.
  4. Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  5. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
  7. 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
  8. Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G. Vizier catalog entry
  9. Kaler, Jim (2 Jan 2009). "V Pup". Stars. Retrieved 31 Jan 2013.
  10. Qian, S.‐B.; Liao, W.‐P.; Fernández Lajús, E. (2008). "Evidence of a Massive Black Hole Companion in the Massive Eclipsing Binary V Puppis". The Astrophysical Journal. 687 (1): 466–470. arXiv:0806.4944. Bibcode:2008ApJ...687..466Q. doi:10.1086/591515. S2CID 380178.
  11. Budding, E; Love, T; Blackford, M G; Banks, T; Rhodes, M J (9 March 2021). "Absolute parameters of young stars: V puppis". Monthly Notices of the Royal Astronomical Society. 502 (4): 6032–6043. arXiv:2102.00362. doi:10.1093/mnras/stab381.
  12. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  13. 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. Vizier catalog entry
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