Melnick 34
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 |
Melnick 34 Media
References
- ↑ 1.0 1.1 1.2 1.3 Lua error in Module:Citation/CS1/Identifiers at line 630: attempt to index field 'known_free_doi_registrants_t' (a nil value).
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 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.
- ↑ Lua error in Module:Citation/CS1/Identifiers at line 630: attempt to index field 'known_free_doi_registrants_t' (a nil value).
- ↑ 4.0 4.1 4.2 4.3 Lua error in Module:Citation/CS1/Identifiers at line 630: attempt to index field 'known_free_doi_registrants_t' (a nil value).
