HD 64760
Star in the constellation Puppis
From Wikipedia, the free encyclopedia
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.
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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 mas[1] |
| 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 |
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]