BAT99-7
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Wolf-Rayet star in the constellation Dorado
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 04h 55m 34.3416s[1] |
| Declination | −67° 30′ 02.683″[1] |
| Apparent magnitude (V) | 13.81[2] |
| Characteristics | |
| Evolutionary stage | Wolf-Rayet |
| Spectral type | WN4b[3] |
| U−B color index | −0.567[4] |
| B−V color index | −0.35[4] |
| Astrometry | |
| Proper motion (μ) | RA: 1.733[1] mas/yr Dec.: 0.367[1] mas/yr |
| Parallax (π) | −0.0083±0.0166 mas [1] |
| Distance | 50,000 pc |
| Absolute magnitude (MV) | −5.02[3] |
| Details | |
| Mass | 25[3] M☉ |
| Radius | 1.1[3] R☉ |
| Luminosity | 692,000[3] L☉ |
| Temperature | 158,500[3] K |
| Rotational velocity (v sin i) | 160[5] km/s |
| Other designations | |
| Brey 6, HD 32109, 2MASS J04553134-6730028 | |
| Database references | |
| SIMBAD | data |
BAT99-7 is a WN-type Wolf-Rayet star located in the Large Magellanic Cloud, in the constellation of Dorado, about 160,000 light years away. The star has a spectrum containing extremely broad emission lines, and is the prototype for the "round line" stars, Wolf-Rayet stars whose spectra are characterized by strong and broad emission lines with round line profiles. The broad emission lines hint at an extremely high temperature of nearly 160,000 Kelvin , which would make it the hottest of all WN stars with known temperatures, as well as an extraordinarily large mass loss rate for a Wolf-Rayet star in the LMC, at 10−4.48 M☉/yr, which means that every 30,200 years, the star loses 1 solar mass worth of mass.[3]
References
[edit ]- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv:2012.01533 . Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657 . S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z. 1322. Bibcode:2012yCat.1322....0Z.
- ^ a b c d e f g Hainich, R.; Rühling, U.; Todt, H.; Oskinova, L. M.; Liermann, A.; Gräfener, G.; Foellmi, C.; Schnurr, O.; Hamann, W. -R. (2014). "The Wolf-Rayet stars in the Large Magellanic Cloud". Astronomy & Astrophysics. 565: A27. arXiv:1401.5474 . Bibcode:2014A&A...565A..27H. doi:10.1051/0004-6361/201322696. S2CID 55123954.
- ^ a b Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; et al. (July 2012). "VizieR On-line Data Catalog: UCAC4 Catalogue". VizieR On-line Data Catalog: I/322A. 1322. Bibcode:2012yCat.1322....0Z.
- ^ Shenar, T.; Hamann, W. -R.; Todt, H. (2014年02月01日). "The impact of rotation on the line profiles of Wolf-Rayet stars". Astronomy and Astrophysics. 562: A118. arXiv:1401.2159 . Bibcode:2014A&A...562A.118S. doi:10.1051/0004-6361/201322496. ISSN 0004-6361. S2CID 21732510.
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