HD 64760

HD 64760 (J Puppis) is a class B0.5 supergiant star in the constellation Puppis. Its apparent magnitude is 4.24 and it is approximately 1,660 light years away based on parallax.

This article is about J Puppis. For j Puppis, see 11 Puppis.
HD 64760
Location of HD 64760 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension  07h 53m 18.15792s[1]
Declination −48° 06′ 10.5637″[1]
Apparent magnitude (V) 4.24[2]
Characteristics
Spectral type B0.5Ib[3]
U−B color index -0.99[2]
B−V color index -0.14[2]
Astrometry
Radial velocity (Rv)+41.00[4] km/s
Proper motion (μ) RA: -5.60[1] mas/yr
Dec.: +5.76[1] mas/yr
Parallax (π)1.97 ± 0.10[1] mas
Distance1,660 ± 80 ly
(510 ± 30 pc)
Absolute magnitude (MV)-4.30[5]
Details
Mass15.5[6] M☉
Radius21.6[7] R☉
Luminosity155,000[7] L☉
Temperature24,600[7] K
Rotation98.9 hours[7]
Rotational velocity (v sin i)238[3] km/s
Other designations
J Puppis, CD-47°3396, GC 10689, GSC 08139-04578, HIP 38518, HR 3090, HD 64760, SAO 219111
Database references
SIMBADdata

The stellar wind structure of HD 64760 has been extensively studied. Its spectrum shows classic P Cygni profiles indicative of strong mass loss and high-velocity winds, but the spectral line profiles are also variable. The variation shows a 2.4 day modulation which is caused by non-radial pulsation of the star itself. Other pulsation periods around 4.81 hours have also been identified.[7]

HD 64760 rotates rapidly. Despite its large size it completes a rotation every 4.1 days compared to every 27 days for the sun. This causes the star to be an oblate spheroid, with the equatorial radius 20% larger than the polar radius. It is estimated that the temperature of the photosphere is 23,300 K at the equator and 29,000 K at the poles, due to gravity darkening. In addition, the surface has temperature variations due to its pulsations. The effective temperature for the star as a whole is 24,600 K, to match the bolometric luminosity of 155,000 L☉.[7]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 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. 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.
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  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. Vizier catalog entry
  6. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. Vizier catalog entry
  7. Kaufer, A.; Prinja, R. K.; Stahl, O. (2002). "Evidence for a connection between photospheric and wind structure in HD 64760". Astronomy and Astrophysics. 382 (3): 1032. Bibcode:2002A&A...382.1032K. doi:10.1051/0004-6361:20011649.
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