V1339 Aquilae
Star in the constellation Aquila
From Wikipedia, the free encyclopedia
V1339 Aquilae, also known as HD 187567, is a Be star in the constellation Aquila. At its brightest its apparent magnitude is 6.22,[3] making it barely visible to the naked eye at a location with very little light pollution. It is located just 8 arc seconds from the center of the open cluster NGC 6828.[8]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 50m 17.47881s[2] |
| Declination | +07° 54′ 08.6936″[2] |
| Apparent magnitude (V) | 6.22 to 6.53[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B2.5IVe[5] |
| U−B color index | −0.7 |
| B−V color index | −0.1 |
| Variable type | Be star[3] |
| Astrometry | |
| Radial velocity (Rv) | −30.10±5[6] km/s |
| Proper motion (μ) | RA: −1.753±0.033[2] mas/yr Dec.: −3.171±0.025[2] mas/yr |
| Parallax (π) | 1.5275±0.0369 mas[2] |
| Distance | 2,140 ± 50 ly (650 ± 20 pc) |
| Details | |
| Mass | 9.5[4] M☉ |
| Radius | 4.64[4] R☉ |
| Luminosity | 6,281[4] L☉ |
| Surface gravity (log g) | 4.08[4] cgs |
| Temperature | 23,848[4] K |
| Rotational velocity (v sin i) | 140[4] km/s |
| Age | 23[7] Myr |
| Other designations | |
| BD+07°4252, HD 187567, HIP 97607, HR 7554, SAO 125116 | |
| Database references | |
| SIMBAD | data |
V1339 Aquilae was discovered to be a Be star in 1925 by P. W. Merrill, M. L. Humason and C. G. Burwell.[9] The star's variability was detected in 1966 by A. W. J. Cousins, R. Lake and R. H. Stoy,[10] and because of this it was given its variable star designation, V1339 Aquilae, in 1979.[11]
V1339 Aquilae is around 9.5 times as massive as the Sun and has 4.6 times its diameter.[4] Its binary nature was discovered by speckle interferometry in 1983, at the Kitt Peak 4 meter telescope. At the time of these speckle observations the stars were separated by 0.057 arc seconds.[12]