Plaskett's star
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 37m 24.04130s[1] |
| Declination | +06° 08′ 07.3719″[1] |
| Apparent magnitude (V) | 6.06[2] |
| Characteristics | |
| Spectral type | O8 III/I + O7.5 III[3] |
| U−B color index | –0.88[2] |
| B−V color index | +0.05[2] |
| Astrometry | |
| Radial velocity (Rv) | +24.5[4] km/s |
| Proper motion (μ) | RA: –2.73[1] mas/yr Dec.: +0.31[1] mas/yr |
| Distance | 5,245 ly (1,608[5] pc) |
| Details | |
| A | |
| Mass | 54[3] M☉ |
| Surface gravity (log g) | 3.5 ± 0.1[3] |
| Temperature | 33,500 ± 2000[3] K |
| Rotational velocity (v sin i) | 75[6] km/s |
| B | |
| Mass | 56[3] M☉ |
| Radius | 13.2 × 14.1[3] R☉ |
| Surface gravity (log g) | 3.5 ± 0.1[3] |
| Temperature | 33000 ± 2000[3] K |
| Rotational velocity (v sin i) | 300[6] km/s |
| Other designations | |
Plaskett's Star (HR 2422) is a spectroscopic binary at a distance of around 6600 light-years. It is one of the most massive binary stars known, with a total mass of around one hundred times that of the Sun.[3] Indeed, it was long thought to be the most massive known binary system,[6] but evidence collected between 1996–2005 demonstrated that Eta Carinae, which was previously thought to be a massive individual star, is a binary system.[8]
This system is named after John Stanley Plaskett, the Canadian astronomer who discovered its binary nature in 1922. Plaskett was assisted in his observations by his son, Harry Hemley Plaskett. The pair have a combined visual magnitude of 6.05, and is located in the constellation of Monoceros.
The orbital period for the pair is 14.39625 ± 0.00095 days.[3] The secondary is a rapid rotator with a projected rotational velocity of 300 km sec–1,[6] giving it a pronounced equatorial bulge.[3]
[edit] References
- ^ a b c d van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c Johnson, H. L. et al (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode 1966CoLPL...4...99J.
- ^ a b c d e f g h i j k Linder, N. et al. (October 2008), "High-resolution optical spectroscopy of Plaskett's star", Astronomy and Astrophysics 489 (2): 713–723, Bibcode 2008A&A...489..713L, doi:10.1051/0004-6361:200810003
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode 1953QB901.W495......
- ^ Megier, A. et al. (November 2009), "The interstellar Ca II distance scale", Astronomy and Astrophysics 507 (2): 833–840, Bibcode 2009A&A...507..833M, doi:10.1051/0004-6361/20079144
- ^ a b c d Mahy, L. et al. (January 2011), "Plaskett's star: analysis of the CoRoT photometric data", Astronomy and Astrophysics 525: A101, Bibcode 2011A&A...525A.101M, doi:10.1051/0004-6361/201014777
- ^ "PLASKETT STAR -- Double or multiple star", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=PLASKETT+STAR, retrieved 2012-01-03
- ^ Iping, Rosina C. et al. (November 2005), "Detection of a Hot Binary Companion of η Carinae", The Astrophysical Journal 633 (1): L37-L40, arXiv:astro-ph/0510581, Bibcode 2005ApJ...633L..37I, doi:10.1086/498268
[edit] External links
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