S Doradus
| 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 | LBV |
| U−B color index | –0.98[3] |
| B−V color index | +0.11[3] |
| Variable type | S Doradus[2] |
| 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) | –7.6 (min)[5] |
| Details | |
| Mass | 45[6] M☉ |
| Radius | 100–380[6] R☉ |
| Luminosity | 1.0 × 106[6] L☉ |
| Temperature | 9–20,000[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
S Doradus is one of the brightest stars in the Large Magellanic Cloud (LMC),[7] 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.
S Doradus is the brightest member of the open cluster NGC 1910, visible in binoculars as a bright condensation within the main bar of the LMC.[8]
This star belongs to its own eponymous S Doradus class of variable stars (these classes are usually named after their prototypes); also designated as luminous blue variables or LBVs. S Doradus exhibits long slow changes in brightness, punctuated by occasional outbursts. The spectrum is variable, a typical and defining characteristic of LBVs. In its quiescent phase, it has a B type spectrum (with emission) and a temperature around 20,000K. In outburst the temperature decreases and has been observed with the spectrum of an F supergiant and a temperature below 8,000K.[7]
See also
References
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