Astronomy:HD 64760
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| Observation data Equinox J2000.0]] (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[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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 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.
- ↑ 3.0 3.1 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.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. Vizier catalog entry
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 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. doi:10.1051/0004-6361:20011649. Bibcode: 2002A&A...382.1032K.
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