Gamma Doradus

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γ Doradus
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension 04h 16m 01.5857s[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[edit]

  1. ^ a b c d e f g h V* gam Dor -- Variable Star of gamma Dor type, database entry, SIMBAD. Accessed on line November 17, 2008.
  2. ^ a b c d e f g h i j 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, Bibcode1999PASP..111..840K.
  3. ^ a b c 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, Bibcode1994MNRAS.270..905B.