WR 134
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| Observation data Epoch 2000 Equinox 2000 |
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|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 11m 14.193s[1] |
| Declination | 36° 10′ 35.07″[1] |
| Apparent magnitude (V) | 8.08[2] |
| Characteristics | |
| Evolutionary stage | Wolf-Rayet |
| Spectral type | WN6-s[3] |
| U−B color index | −0.44[2] |
| B−V color index | 0.00[2] |
| Variable type | Algol[4] |
| Astrometry | |
| Proper motion (μ) | RA: −4.66[1] mas/yr Dec.: −8.59[1] mas/yr |
| Parallax (π) | 0.04 ± 0.68[1] mas |
| Distance | 1,740[5] pc |
| Absolute magnitude (MV) | -5.07[3] |
| Details | |
| Mass | 19[3] M☉ |
| Radius | 5.29[3] R☉ |
| Luminosity | 400,000[3] L☉ |
| Temperature | 63,100[3] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
WR 134 is a variable Wolf-Rayet star located around 6,000 light years away from Earth in the constellation of Cygnus, surrounded by a faint bubble nebula blown by the intense radiation and fast wind from the star.
WR 134 is classified as an Algol type eclipsing variable and given the designation V1769 Cygni, but the variation is not strictly periodic and brightness changes occur on timescales of hours to days. It has been investigated several times to search for companions. Morel reported a 2.25 day primary period but considered the variations to be due to rotational modulation rather than the effects of a companion.[6] Rustamov suggests a 1.887 day orbital period with a K-M dwarf companion, but with additional optical variations.[7]
Both hard and soft X-rays have been detected from WR 134 but the sources are not fully explained. The emissions do not match a single star of the expected temperature, are not sufficient for colliding winds between two hot stars, and any compact source such as a neutron star or cool dwarf would be in an unlikely orbit.[8]
References
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