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 about one hundred times that of the Sun.[citation needed] Indeed, it was long thought to be the most massive known binary system,[6] but since 2008 there is a body of opinion that Eta Carinae, which was previously thought to be a massive individual star, could be a binary system.[citation needed]
It 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 star has a 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 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
[edit] External links
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