Mu Normae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 34m 05.0207s |
| Declination | −44° 02′ 43.133″ |
| Apparent magnitude (V) | 4.914 |
| Characteristics | |
| Spectral type | O9.7Iab[1] |
| Apparent magnitude (U) | 4.14 |
| Apparent magnitude (B) | 4.951 |
| Apparent magnitude (J) | 4.912 |
| Apparent magnitude (H) | 4.679 |
| Apparent magnitude (K) | 4.612 |
| U−B color index | -0.811 |
| B−V color index | +0.0369 |
| Variable type | Suspected Alpha Cygni |
| Astrometry | |
| Radial velocity (Rv) | +8.6 km/s |
| Proper motion (μ) | RA: 0.52 mas/yr Dec.: -2.53 mas/yr |
| Parallax (π) | 0.70 ± 0.73 mas |
| Distance | 1,000[2] pc |
| Absolute magnitude (MV) | -6.45[1] |
| Details | |
| Mass | 30 M☉ |
| Radius | 25[1] R☉ |
| Luminosity | 210,000 L☉ |
| Luminosity (visual, LV) | 339,000[1] L☉ |
| Surface gravity (log g) | 2.91[1] cgs |
| Temperature | 28,000[1] K |
| Rotational velocity (v sin i) | 57[1] km/s |
| Age | ~4 million years |
| Other designations | |
Mu Normae, HD 149038, HR 6155, HIP 81122 | |
| Database references | |
| SIMBAD | data |
Mu Normae is a blue supergiant star of spectral type O9.71ab in the constellation Norma.[3]It is suspected of being an Alpha Cygni variable, which are named after the also similar star Deneb. Being a blue supergiant, it is destined to become a red supergiant in a few million years and eventually a type-II supernova.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Lefever, K.; Puls, J.; Aerts, C. (2007). "Statistical properties of a sample of periodically variable B-type supergiants". Astronomy and Astrophysics 463 (3): 1093. doi:10.1051/0004-6361:20066038.
- ↑ Fullerton, A. W.; Massa, D. L.; Prinja, R. K. (2006). "The Discordance of Mass‐Loss Estimates for Galactic O‐Type Stars". The Astrophysical Journal 637 (2): 1025. doi:10.1086/498560.
- ↑ Sota, A.; Maíz Apellániz, J.; Morrell, N.I.; Barbá, R.H.; Walborn, N.R.; Gamen, R.C.; Arias, J.I.; Alfaro, E.J. (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement 211 (1): 84. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. 10.