Cygnus OB2-8A
The correct title of this article is Cygnus OB2 #8A. The substitution or omission of the # is because of technical restrictions.
Cygnus OB2 #8A | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 33m 15.07905s |
| Declination | +41° 18' 50.4762"' |
| Apparent magnitude (V) | 8.99 |
| Characteristics | |
| Spectral type | O6If/O5.5III(f) |
| U−B color index | ? |
| B−V color index | ? |
| Variable type | Eclipsing binary |
| Astrometry | |
| Radial velocity (Rv) | -27.7 km/s |
| Proper motion (μ) | RA: -0.91 mas/yr Dec.: -6.02 mas/yr |
| Parallax (π) | -3.91 ± 1.76 mas |
| Distance | 1,700[1] pc |
| Absolute magnitude (MV) | -7.18/-5.63 |
| Details | |
| Mass | 44.1/37.4[1] M☉ |
| Radius | 20/14.8[1] R☉ |
| Luminosity | 650,000/468,000[1] L☉ |
| Surface gravity (log g) | 3.48/3.67[1] cgs |
| Temperature | 36,800/39,200[1] K |
| Metallicity | ? |
| Rotation | ? |
| Age | 6.43 million years |
| Orbit | |
| Primary | Cyg OB2-#8A1 |
| Companion | Cyg Ob2-#8A2 |
| Period (P) | 21.9 days[2] |
| Semi-major axis (a) | >35 R☉[2] |
| Eccentricity (e) | 0.24[2] |
| Semi-amplitude (K1) (primary) | 82.8[2] km/s |
| Semi-amplitude (K2) (secondary) | 95.8[2] km/s |
| Other designations | |
VI CYG 8A, 1E 203127+4108.5, Hilt 996, TYC 3161-1325-1, ADS 14000 A, 2E 4382, HIP 101425, UBV 17839, AG+41° 1925, 2E 2031.4+4108, IDS 20297+4058, ALS 11423, EM* CDS 1173, LS III +41 37, Ass Cyg OB 2-8 A, 1ES 2031+41.1, 2MASS J20331508+4118504, BD+40° 4227, GCRV 20036, PPM 60129, CCDM J20332+4119A, 1RXS J203315.8+411848, CGO 605, GOS G080.22+00.79 01, SAO 49781, CSI+40 4227 1, GSC 03161-01325, Schulte 8A, CXOCyg J203315.07+411850.3, HIC 101425, Schulte 8. | |
| Database references | |
| SIMBAD | data |
Cygnus OB2 #8A or TYC 3161-01325-1 is a spectroscopic binary with a period of 21.9 days.[2] It is located near the center of the Cygnus OB2 association.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 De Becker, M.; Rauw, G.; Sana, H.; Pollock, A. M. T.; Pittard, J. M.; Blomme, R.; Stevens, I. R.; Van Loo, S. (2006). "XMM-Newton observations of the massive colliding wind binary and non-thermal radio emitter CygOB2#8A [O6If + O5.5III(f)]". Monthly Notices of the Royal Astronomical Society 371 (3): 1280. Bibcode:2006MNRAS.371.1280D. doi:10.1111/j.1365-2966.2006.10746.x.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 De Becker, M.; Rauw, G.; Manfroid, J. (2004). "A Spectroscopic study of the non-thermal radio emitter Cyg OB2 #8A: Discovery of a new binary system". Astronomy and Astrophysics 424 (3): L39. arXiv:astro-ph/0408027. Bibcode:2004A&A...424L..39D. doi:10.1051/0004-6361:200400049.
External links
- Cygnus OB2-8A on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
20h 33m 15.0789s, +41° 18′ 50.494″
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