Gamma Doradus

γ Doradus

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Dorado
Right ascension	04^h 16^m 01.5857^s[1]
Declination	−51° 29′ 11.933″[1]
Apparent magnitude (V)	4.25[2]
Characteristics
Spectral type	F0V[2]
U−B color index	+0.03[3]
B−V color index	+0.30[3]
R−I color index	+0.16[3]
Variable type	Gamma Doradus variable[1]
Astrometry
Radial velocity (Rv)	25.2 ± 2[1] km/s
Proper motion (μ)	RA: 100.57[1] mas/yr Dec.: 184.23[1] mas/yr
Parallax (π)	49.26 ± 0.50[1] mas
Distance	66.2 ± 0.7 ly (20.3 ± 0.2 pc)
Absolute magnitude (MV)	2.72[2]
Details
Mass	1.57[2] M☉
Radius	1.70[2] R☉
Luminosity (bolometric)	7.0[2] L☉
Temperature	7200[2] K
Metallicity	[M/H] = −0.02[2]
Rotational velocity (v sin i)	62[2] km/s
Other designations
γ Dor, Gamma Doradus, Gamma Dor, CD−51 1066, CPD−51 524, FK5 157, GC 5179, GJ 167.1, GJ 9150, HD 27290, HIP 19893, HR 1338, PPM 333343, SAO 233457.[1]
Database references
SIMBAD	data

Gamma Doradus (Gamma Dor, γ Doradus, γ Dor) is the third-brightest star in the constellation of Dorado.^[4] It has an apparent visual magnitude of approximately 4.25 and is a variable star, the type star of the class of Gamma Doradus variables. These stars, like γ Doradus, are pulsating variables which vary in brightness by less than a tenth of a magnitude owing to nonradial gravity wave oscillations.^[2] The magnitude of γ Doradus itself has been observed to have two sinusoidal variations with periods of approximately 17.6 and 18.2 hours. There is also some additional unexplained, apparently random fluctuation.^[5]

References

1. V* gam Dor -- Variable Star of gamma Dor type, database entry, SIMBAD. Accessed on line November 17, 2008.
2. Gamma Doradus Stars: Defining a New Class of Pulsating Variables, Anthony B. Kaye et al., Publications of the Astronomical Society of the Pacific 111, #761 (July 1999), pp. 840–844, Bibcode: 1999PASP..111..840K.
3. HR 1338, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 17, 2008.
4. Gamma Dor, Jim Kaler, Stars. Accessed on line November 17, 2008.
5. γ Doradus: evidence for a new class of pulsating star, L. A. Balona, K. Krisciunas, and A. W. J. Cousins, Monthly Notices of the Royal Astronomical Society 270, #4 (October 15, 1994), pp. 905–913, Bibcode: 1994MNRAS.270..905B.