Cygnus OB9
| Cygnus OB9 | |
|---|---|
| Observation data (J2000.0 epoch) | |
| Right ascension | 20h 21m 00.0s[1] |
| Declination | 39° 54′ 00″ |
| Distance | 5,000 ly |
| Apparent magnitude (V) | 7.7 |
| Physical characteristics | |
| Associations | |
| Constellation | Cygnus |
Cygnus OB9 is an OB association in Cygnus.[2] It is near to the Cygnus OB2 association. The region is embedded within a wider one of star formation known as Cygnus X, which is one of the most luminous objects in the sky at radio wavelengths. The region is approximately 5,000 light years from Earth in the constellation of Cygnus.[3]
Although Cygnus OB9 has many O and B type stars, Cygnus OB9 is also hidden behind a massive dust cloud known as the Cygnus Rift like Cygnus OB2.
| Star name | Spectral type | MV | Temperature (K) | Mass (M☉) |
|---|---|---|---|---|
| V2245 Cygni (HD 229196) | O5 | −6.19 | 40,862 | 61.6 |
| ALS 11244 | O5If | −5.42 | 38,612 | 40.1 |
| BD+39 4177 | O6.5 | −5.51 | 37,870 | 39.3 |
| HD 229250 | O7 | −5.28 | 36,872 | 33.9 |
| BD+39 4168 | O7 | −5.40 | 36,872 | 37.3 |
| HD 229202 | O8V | −4.66 | 34,877 | 25.0 |
| HD 228929 | B0.5Ib | −5.60 | 22,537 | 20.5 |
| HD 193945 | B0Vnn | −5.11 | 30,110 | 23.8 |
| RIC 13431720 | B1Ia | −5.91 | 19,979 | 20.5 |
| HD 193426 | B9Ia | −6.71 | 10,500 | 15.4 |
See also
[edit]References
[edit]- ^ "Ass Cyg OB 9". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-02.
- ^ Pickett, Daniel Edward (1993). Photoelectric UBV photometry of Cygnus OB3 and Cygnus OB9 (M.Sc. thesis). University of Montana. p. 39. Bibcode:1993PhDT.......160P.
- ^ Zakirov, M. M.; Eshankulova, M. U. (2008). "Close binary systems in regions of OB associations. VI. V498 Cyg in Cyg OB9". Kinematics and Physics of Celestial Bodies. 24 (2): 77–88. Bibcode:2008KPCB...24...77Z. doi:10.3103/S0884591308020037. S2CID 121799853.
- ^ Comerón, F.; Pasquali, A. (2012). "New members of the massive stellar population in Cygnus". Astronomy & Astrophysics. 110: 2715. Bibcode:2012A&A...543A.101C. doi:10.1051/0004-6361/201219022.
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