Melnick 34
star in the constellation Dorado
BAT99-116 (commonly called Melnick 34 or Mk34) is a binary Wolf–Rayet star near R136 in the 30 Doradus complex (also known as the Tarantula Nebula) in the Large Magellanic Cloud. Both parts are amongst the most massive and luminous stars known. It has a spectral type of WN5h and the most massive binary system with x-ray luminosity. Because of such a high mass, they are expected to only have a few million years of life and become a black hole.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 5h 38m 44.26s[1] |
| Declination | −69° 06′ 05.88″[1] |
| Apparent magnitude (V) | 13.09[1] |
| Characteristics | |
| Evolutionary stage | Wolf–Rayet star |
| Spectral type | WN5h + WN5h[2] |
| B−V color index | +0.25[1] |
| Astrometry | |
| Radial velocity (Rv) | 287±5[2] km/s |
| Distance | 163,000 ly (49,970[3] pc) |
| Absolute magnitude (MV) | -7.42[2] |
| Orbit[2] | |
| Period (P) | 154.55±0.05 d |
| Eccentricity (e) | 0.68±0.02 |
| Inclination (i) | ~50° |
| Periastron epoch (T) | 57671.2±0.9 JD |
| Argument of periastron (ω) (secondary) | 20.9±3.8° |
| Semi-amplitude (K1) (primary) | 130±7 km/s |
| Semi-amplitude (K2) (secondary) | 141±6 km/s |
| Details | |
| A | |
| Mass | 148[4] M☉ |
| Radius | 19.3±2.8[2] R☉ |
| Luminosity | 2,042,000[4] L☉ |
| Temperature | 53,000±1,200[2] K |
| Age | 0.5±0.3[2] Myr |
| B | |
| Mass | 135[4] M☉ |
| Radius | 18.2±2.7[2] R☉ |
| Luminosity | 1,585,000[4] L☉ |
| Temperature | 53,000±1,200[2] K |
| Age[broken anchor] | 0.6±0.3[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
change- ↑ 1.0 1.1 1.2 1.3 Doran, E. I.; Crowther, P. A.; de Koter, A.; Evans, C. J.; McEvoy, C.; Walborn, N. R.; Bastian, N.; Bestenlehner, J. M.; Grafener, G.; Herrero, A.; Kohler, K.; Maiz Apellaniz, J.; Najarro, F.; Puls, J.; Sana, H.; Schneider, F. R. N.; Taylor, W. D.; van Loon, J. Th.; Vink, J. S. (2013). "The VLT-FLAMES Tarantula Survey - XI. A census of the hot luminous stars and their feedback in 30 Doradus". Astronomy & Astrophysics. 558: 134. arXiv:1308.3412. Bibcode:2013A&A...558A.134D. doi:10.1051/0004-6361/201321824. S2CID 118510909.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 Tehrani, Katie A.; Crowther, Paul A.; Bestenlehner, Joachim M.; Littlefair, Stuart P.; Pollock, A M T.; Parker, Richard J.; Schnurr, Olivier (2019). "Weighing Melnick 34: The most massive binary system known". Monthly Notices of the Royal Astronomical Society. 484 (2): 2692–2710. arXiv:1901.04769. Bibcode:2019MNRAS.484.2692T. doi:10.1093/mnras/stz147.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ↑ Pietrzyński, G; D. Graczyk; W. Gieren; I. B. Thompson; B. Pilecki; A. Udalski; I. Soszyński; et al. (7 March 2013). "An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent". Nature. 495 (7439): 76–79. arXiv:1303.2063. Bibcode:2013Natur.495...76P. doi:10.1038/nature11878. PMID 23467166. S2CID 4417699.
- ↑ 4.0 4.1 4.2 4.3 Shenar, T.; Sablowski, D. P.; Hainich, R.; Todt, H.; Moffat, A. F. J.; Oskinova, L. M.; Ramachandran, V.; Sana, H.; Sander, A. A. C.; Schnurr, O.; St-Louis, N.; Vanbeveren, D.; Götberg, Y.; Hamann, W.-R. (2019). "The Wolf–Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud". Astronomy & Astrophysics. 627: A151. doi:10.1051/0004-6361/201935684. S2CID 162183986.
