HD 64760

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
Distance	1,660 ± 80  ly (510 ± 30  pc)
Absolute magnitude  (MV)	-4.30 [5]
Details
Mass	15.5 [6]   M☉
Radius	21.6 [7]   R☉
Luminosity	155,000 [7]   L☉
Temperature	24,600 [7]   K
Rotation	98.9 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
SIMBAD	data

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.

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): 653–664. 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. 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): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
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. 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 (1): 190–200. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID   118629873. 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 .