Gamma Doradus
Star in the constellation Dorado
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Gamma Doradus, Latinized from γ Doradus, is the third-brightest star in the southern constellation of Dorado.[11] It is faintly visible to the naked eye with an apparent visual magnitude of approximately 4.25, and is a variable star, the prototype of the class of Gamma Doradus variables.[2] The star is located at a distance of 67 light-years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +25 km/s.[5] Based on its motion through space, it appears to be a member of the IC 2391 supercluster.[12]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Dorado |
| Right ascension | 04h 16m 01.58662s[1] |
| Declination | −51° 29′ 11.9327″[1] |
| Apparent magnitude (V) | 4.25[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[1] |
| Spectral type | F1V[3] |
| U−B color index | +0.03[4] |
| B−V color index | +0.30[4] |
| R−I color index | +0.16[4] |
| Variable type | γ Dor[2] |
| Astrometry | |
| Radial velocity (Rv) | +25.2±0.5[5] km/s |
| Proper motion (μ) | RA: +100.502[1] mas/yr Dec.: +184.180[1] mas/yr |
| Parallax (π) | 48.9494±0.1689 mas[1] |
| Distance | 66.6 ± 0.2 ly (20.43 ± 0.07 pc) |
| Absolute magnitude (MV) | 2.72[2] |
| Details | |
| Mass | 1.56±0.06[6] M☉ |
| Radius | 1.67±0.07[7] R☉ |
| Luminosity | 6.52±0.25[7] L☉ |
| Surface gravity (log g) | 4.19±0.09[7] cgs |
| Temperature | 7,139±132[7] K |
| Metallicity [Fe/H] | +0.05±0.14[8] dex |
| Rotational velocity (v sin i) | 56.6±0.5[9] km/s |
| Age | 0.535–1.207[6] Gyr |
| Other designations | |
| γ Dor, CD−51°1066, CPD−51°524, FK5 157, GC 5179, GJ 167.1, GJ 9150, HD 27290, HIP 19893, HR 1338, SAO 233457, PPM 333343[10] | |
| Database references | |
| SIMBAD | data |
This is an F-type main-sequence star with a stellar classification of F1V.[3] It is a pulsating variable that varies in brightness by less than a tenth of a magnitude owing to nonradial gravity wave oscillations.[2] Four pulsation frequencies have been identified with periods of 17.6, 12.8, 16.3, and 18.2 hours.[9][14] The star is around 0.5–1.2 billion years old and is spinning with a projected rotational velocity of 57 km/s.[9] It has 1.6 times the mass of the Sun[6] and 1.7 times the Sun's radius.[7] The star is radiating 6.5 times the luminosity of the Sun from its photosphere at an effective temperature of 7,139 K.[7]
An infrared excess has been detected at multiple frequencies,[15] indicating that the star is being orbited by a pair of debris disks.[16]