29 Vulpeculae
Binary star system in the constellation Vulpecula
From Wikipedia, the free encyclopedia
29 Vulpeculae is a suspected astrometric binary star system in the northern constellation Vulpecula. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.82.[2] The system lies approximately 209 light years away from the Sun based on parallax,[1] and is a member of the IC 2391 supercluster.[8] It is moving closer to the Earth with a heliocentric radial velocity of −17 km/s.[4]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 38m 31.32904s[1] |
| Declination | 21° 12′ 04.3763″[1] |
| Apparent magnitude (V) | 4.82[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A0V[3] |
| U−B color index | −0.07[2] |
| B−V color index | −0.02[2] |
| Astrometry | |
| Radial velocity (Rv) | −17.10[4] km/s |
| Proper motion (μ) | RA: +78.741[1] mas/yr Dec.: −4.572[1] mas/yr |
| Parallax (π) | 15.6257±0.3374 mas[1] |
| Distance | 209 ± 5 ly (64 ± 1 pc) |
| Absolute magnitude (MV) | 0.56[5] |
| Details | |
| Mass | 2.67[3] M☉ |
| Luminosity | 71[3] L☉ |
| Surface gravity (log g) | 4.20[6] cgs |
| Temperature | 10,507[6] K |
| Metallicity [Fe/H] | −0.15[5] dex |
| Rotational velocity (v sin i) | 52[3] km/s |
| Age | 254[6] Myr |
| Other designations | |
| 29 Vul, BD+20°4658, FK5 1539, HD 196724, HIP 101867, HR 7891, SAO 88944[7] | |
| Database references | |
| SIMBAD | data |
Radial velocity measurements from High Accuracy Radial Velocity Planet Searcher with an amplitude of 4 km/s indicate that it is a spectroscopic binary of unknown period.[9] The visible component is an A-type main-sequence star with a stellar classification of A0V,[3] and has some slight abundance anomalies that resemble a weak Am star.[10] It is catalogued as a shell star, showing spectral features of a cooler circumstellar jacket of gas,[11] and may be a proto-shell star.[10] The star is an estimated 254[6] million years old with a relatively low projected rotational velocity of 52 km/s.[3] It has 2.67[3] times the mass of the Sun and is radiating 71[3] times the Sun's luminosity from its photosphere at an effective temperature of 10,507 K.[6]