S Monocerotis
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 40m 58.6607s[1] |
| Declination | +09° 53′ 44.715″[1] |
| Apparent magnitude (V) | 4.66 |
| Characteristics | |
| Spectral type | O7Ve[2] |
| U−B color index | −1.034[3] |
| B−V color index | −0.261[3] |
| Astrometry | |
| Radial velocity (Rv) | 33.2[4] km/s |
| Proper motion (μ) | RA: –0.66[1] mas/yr Dec.: –2.51[1] mas/yr |
| Parallax (π) | 3.19 ± 0.73[1] mas |
| Distance | approx. 1,000 ly (approx. 310 pc) |
| Details | |
| Radius | 9.3[5] R☉ |
| Surface gravity (log g) | 4.0[5] |
| Temperature | 35,427 ± 73[5] K |
| Rotational velocity (v sin i) | 120[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
S Monocerotis, also known as 15 Monocerotis, is a massive variable star system located in the constellation Monoceros.[7] It is a spectroscopic binary system with an orbital period of 25 years.[8] Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[9] It is a type O main sequence dwarf with a stellar classification of O7Ve, and is about 8,500 times as luminous as the Sun, while varying in between magnitude 4.2 and 4.6. The star lies at the base of the Christmas Tree Cluster in NGC 2264.
References [edit]
- ^ a b c d e Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ a b "HD 47839 -- Pre-main sequence Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-10.
- ^ a b Oja, T. (August 1985). "Photoelectric photometry of stars near the north Galactic pole. II". Astronomy and Astrophysics Supplement Series 61: 331–339. Bibcode:1985A&AS...61..331O.
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495.....
- ^ a b c Underhill, A. B. et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode:1979MNRAS.189..601U
- ^ 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.
- ^ Heather Couper and Nigel Henbest (1999). Space Encyclopedia. Verona, Italy: Dorling Kindersley. p. 175. ISBN 0-7894-4708-8.
- ^ Gies, Douglas (July 2004). The Masses of the O-type Binary 15 Monocerotis. HST Proposal ID #10107. Bibcode:2004hst..prop10107G.
- ^ Garrison, R. F. (December 1993), "Anchor Points for the MK System of Spectral Classification", Bulletin of the American Astronomical Society 25: 1319, Bibcode:1993AAS...183.1710G, retrieved 2012-02-04
External links [edit]
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