S Doradus
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 18m 14.35s[1] |
| Declination | -69° 15′ 01.10″[1] |
| Apparent magnitude (V) | 9.565[1] (8.6 to 11.5 (B))[2] |
| Characteristics | |
| Spectral type | A0e |
| U−B color index | –0.98[3] |
| B−V color index | +0.11[3] |
| Variable type | LBV |
| Astrometry | |
| Radial velocity (Rv) | +228[4] km/s |
| Proper motion (μ) | RA: 0.7[1] mas/yr Dec.: 4.9[1] mas/yr |
| Distance | 169,000 ly (51,800 pc) |
| Absolute magnitude (MV) | –9.9 |
| Details | |
| Mass | 45[5] M☉ |
| Radius | 100–380[5] R☉ |
| Luminosity | 1.0 × 106[5] L☉ |
| Temperature | 9–20,000[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
S Doradus is one of the brightest stars in the Large Magellanic Cloud,[6] a satellite of the Milky Way. A hypergiant, it is one of the most luminous stars known (sometimes more luminous than −10 absolute magnitude), but so far away that it is invisible to the naked eye.
This star belongs to its own eponymous S Doradus class of variable stars (these classes are usually named after their prototypes); also designated as the class luminous blue variable or LBV, of which S Doradus forms the archetype. S Doradus exhibits long, slow changes in brightness, punctuated by occasional outbursts. Although it has a nominal stellar classification of A0e, in 2000 it was found to have the spectrum of an F-type star (F0).[6]
[edit] See also
[edit] References
- ^ a b c d e Høg, E. et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27–L30, Bibcode 2000A&A...355L..27H
- ^ "S Dor", General Catalogue of Variable Stars (Sternberg Astronomical Institute, Moscow, Russia), http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=S+Dor, retrieved 2010-11-24
- ^ a b Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode 1978A&AS...34....1N
- ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode 1967IAUS...30...57E.
- ^ a b c d Lamers, H. J. G. L. M. (February 6–10, 1995), "Observations and Interpretation of Luminous Blue Variables", Proceedings of IAU Colloquium 155, Astrophysical applications of stellar pulsation, Cape Town, South Africa: Astronomical Society of the Pacific, pp. 176–191, Bibcode 1995ASPC...83..176L
- ^ a b Massey, Philip (February 2000), "An Unprecedented Change in the Spectrum of S Doradus: As Cool as It Gets", The Publications of the Astronomical Society of the Pacific 112 (768): 144–147, Bibcode 2000PASP..112..144M, doi:10.1086/316515
[edit] External links
- http://seds.org/~spider/Spider/Misc/sDor.html
- http://www.daviddarling.info/encyclopedia/S/S_Doradus.html
- http://books.google.com.br/books?id=sIcdZ3VKdpEC&pg=PA151&lpg=PA151&dq=%22S+Doradus%22&source=web&ots=RTPYWXf5c5&sig=BmO4BwtwgJuwuvvU3DDJxeBfkG8&hl=pt-BR#PPA152,M1
- http://jumk.de/astronomie/big-stars/s-doradus.shtml
|
|||||||||||
 |
This variable star–related article is a stub. You can help Wikipedia by expanding it. |
