Kappa1 Apodis
- For other star systems with this Bayer designation, see Kappa Apodis.
 Location of κ1 Apodis (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Apus |
| Right ascension | 15h 31m 30.82178s[1] |
| Declination | −73° 23′ 22.5291″[1] |
| Apparent magnitude (V) | 5.52[2] |
| Characteristics | |
| Spectral type | B1npe[3] |
| U−B color index | -0.791[2] |
| B−V color index | -0.128[2] |
| Variable type | γ Cas[4] |
| Astrometry | |
| Radial velocity (Rv) | +62[5] km/s |
| Proper motion (μ) | RA: +0.56[1] mas/yr Dec.: -18.40[1] mas/yr |
| Parallax (π) | 2.63 ± 0.27[1] mas |
| Distance | approx. 1,200 ly (approx. 380 pc) |
| Details | |
| Mass | 12.0 ± 0.3[6] M☉ |
| Surface gravity (log g) | 3.90[7] cgs |
| Temperature | 21,500[7] K |
| Age | 5.6 ± 1.0[6] Myr |
| Other designations | |
Kappa1 Apodis is the Bayer designation for a binary star[3] system in the southern circumpolar constellation of Apus. Based upon parallax measurements, it is located roughly 1,200 light-years (370 parsecs) from Earth. The combined apparent visual magnitude of the system is 5.52,[2] indicating that this is a faint, naked eye star that can be viewed in dark suburban skies.
This is a spectroscopic binary system with an orbital period of 0.6 days.[3] The combined spectrum matches a stellar classification of B1npe.[3] The 'e' suffix indicates that this is a Be star with emission lines in the spectrum. An 'n' means that the absorption lines in the spectrum are broadened from the Doppler effect as a result of rapid rotation. Finally, the 'p' shows some peculiarity in the spectrum. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +5.43 to +5.61.
This is a runaway star with a peculiar velocity of 69.8 ± 4.7 km/s.[6] Because it is a binary star system, it was most likely not turned into a runaway system as the result of a supernova explosion.[3] A companion star is a 12th magnitude orange K-type subgiant located at an angular separation of 27 arcseconds.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 6.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
