MY Cephei
MY Cephei (IRC +60375) is a red supergiant located in NGC 7419 in the constellation of Cepheus. It has an unusual spectral type of M7.5, one of the latest spectral types of any supergiant, and is one of the coolest red supergiants, and as well as one of the largest known stars.[3] It is a semiregular variable star with a maximum brightness of magnitude 14.4 and a minimum of magnitude 15.5.[9]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 54m 31.7s[1] |
| Declination | +60° 49′ 38.97″[1] |
| Apparent magnitude (V) | 14.4 - 15.5[2] |
| Characteristics | |
| Evolutionary stage | OH/IR red supergiant[3] |
| Spectral type | M6-7Iab[2] |
| Apparent magnitude (G) | 10.2686[1] |
| Apparent magnitude (H) | 2.98 |
| Apparent magnitude (K) | 2.14 |
| Variable type | SRc[2] |
| Astrometry | |
| Proper motion (μ) | RA: –2.635[1] mas/yr Dec.: –1.719[1] mas/yr |
| Parallax (π) | 0.9284 ± 0.1404[1] mas |
| Distance | 3,000+350 −290[4] pc |
| Details | |
| Mass | 14.5[5] M☉ |
| Radius | 1,134[6]–2,061[7][lower-alpha 1] R☉ |
| Luminosity | 129,000[4]–310,000[7] L☉ |
| Temperature | 3,025±213[8] K |
| Age | 9[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
See also
- VX Sagittarii – another late-type red supergiant star
- VY Canis Majoris - another large supergiant star.
- Stephenson 2-18 - another cool supergiant star.
Notes
- Applying the Stefan-Boltzmann Law with a nominal solar effective temperature of 5,772 K:
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- "GCVS Query=MY Cep". General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2020-08-06.
- Beauchamp, Alain; Moffat, Anthony F. J.; Drissen, Laurent (1994). "The galactic open cluster NGC 7419 and its five red supergiants". Astrophysical Journal Supplement Series. 93: 187. Bibcode:1994ApJS...93..187B. doi:10.1086/192051.
- Davies, Ben; Beasor, Emma R. (March 2020). "The `red supergiant problem': the upper luminosity boundary of Type II supernova progenitors". MNRAS. 493 (1): 468–476. arXiv:2001.06020. Bibcode:2020MNRAS.493..468D. doi:10.1093/mnras/staa174.
- Marco, A.; Negueruela, I. (2013). "NGC 7419 as a template for red supergiant clusters". Astronomy & Astrophysics. 552: A92. arXiv:1302.5649. Bibcode:2013A&A...552A..92M. doi:10.1051/0004-6361/201220750.
- Beasor, Emma R; Davies, Ben; Arroyo-Torres, B; Chiavassa, A; Guirado, J. C; Marcaide, J. M; Alberdi, A; De Wit, W. J; Hofmann, K. -H; Meilland, A; Millour, F; Mohamed, S; Sanchez-Bermudez, J (2018). "The evolution of red supergiant mass-loss rates". Monthly Notices of the Royal Astronomical Society. 475 (1): 55. arXiv:1712.01852. Bibcode:2018MNRAS.475...55B. doi:10.1093/mnras/stx3174.
- Humphreys, Roberta M.; Helmel, Greta; Jones, Terry J.; Gordon, Michael S. (August 2020). "Exploring the Mass Loss Histories of the Red Supergiants". arXiv e-prints: arXiv:2008.01108.
- Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
- Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
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