PP Carinae
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 Location of PP Carinae (circled) near the center | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 32m 01.46297s[1] |
| Declination | –61° 41′ 07.1963″[1] |
| Apparent magnitude (V) | +3.30[2] |
| Characteristics | |
| Spectral type | B4 Vne[3] |
| U−B color index | –0.71[4] |
| B−V color index | –0.11[4] |
| Astrometry | |
| Radial velocity (Rv) | +26.0[2] km/s |
| Proper motion (μ) | RA: –17.01[1] mas/yr Dec.: +11.50[1] mas/yr |
| Parallax (π) | 6.75 ± 0.40[1] mas |
| Distance | 480 ± 30 ly (148 ± 9 pc) |
| Details | |
| Mass | 7.6 ± 0.1[5] M☉ |
| Radius | 6.0[6] R☉ |
| Surface gravity (log g) | 3.52[6] cgs |
| Temperature | 17,389[6] K |
| Rotational velocity (v sin i) | 325[7] km/s |
| Age | 39.8 ± 7.6[5] Myr |
| Other designations | |
PP Carinae is the variable star designation for a star in the southern constellation of Carina. It has the Bayer designation p Carinae (p Car) and, at an apparent visual magnitude of +3.30,[2] is readily visible to the naked eye from the southern hemisphere. From the observed parallax shift of this star as the Earth orbits the Sun, its distance can be estimated as roughly 480 light-years (150 parsecs) with a 6% margin of error.[1]
PP Carinae is a B-type main sequence star with a stellar classification of B4 Vne.[3] The 'ne' suffix indicates it is a rapidly rotating Be star that is surrounded by hot circumstellar gas. This material adds emission lines to the spectrum of the star. It has a projected rotational velocity of 325 km s–1,[7] with about 7.6[5] times the mass and 6[6] times the radius of the Sun. This star is classified as a Gamma Cassiopeiae type variable and its brightness varies from magnitude +3.27 to +3.37.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 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.
- ↑ 2.0 2.1 2.2 Wielen, R. et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W.
- ↑ 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two dimensional spectral types for the HD stars 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ↑ 4.0 4.1 Feinstein, A.; Marraco, H. G. (November 1979), "The photometric behavior of Be Stars", Astronomical Journal 84: 1713–1725, Bibcode:1979AJ.....84.1713F, doi:10.1086/112600.
- ↑ 5.0 5.1 5.2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 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.
- ↑ 6.0 6.1 6.2 6.3 Meilland, A.; Stee, Ph.; Chesneau, O.; Jones, C. (October 2009), "VLTI/MIDI observations of 7 classical Be stars", Astronomy and Astrophysics 505 (2): 687–693, arXiv:0908.1239, Bibcode:2009A&A...505..687M, doi:10.1051/0004-6361/200911960.
- ↑ 7.0 7.1 Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago 239 (1), Bibcode:1970CoAsi.239....1B.
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