Gamma Doradus

Gamma Doradus

A light curve for Gamma Doradus, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension 04h 16m 01.58823s[2]
Declination −51° 29′ 11.9191″[2]
Apparent magnitude (V) 4.25[3]
Characteristics
Evolutionary stage Main sequence
Spectral type F1V[4]
U−B color index +0.03[5]
B−V color index +0.30[5]
R−I color index +0.16[5]
Variable type γ Dor[3]
Astrometry
Radial velocity (Rv)+25.2±0.5[6] km/s
Proper motion (μ) RA: +99.463[2] mas/yr
Dec.: +183.353[2] mas/yr
Parallax (π)48.8984 ± 0.2817 mas[2]
Distance66.7 ± 0.4 ly
(20.5 ± 0.1 pc)
Absolute magnitude (MV)2.72[3]
Details
Mass1.56±0.06[7] M☉
Radius1.85+0.25
−0.10[2] R☉
Luminosity6.999+0.051
−0.052[2] L☉
Luminosity (bolometric)7.0[3] L☉
Surface gravity (log g)4.29±0.18[8] cgs
Temperature6,906+89
−423[2] K
Metallicity [Fe/H]+0.05±0.14[8] dex
Rotational velocity (v sin i)56.6±0.5[9] km/s
Age0.535–1.207[7] Gyr
Other designations
γ Dor, CD−51°1066, CPD−51°524, FK5 157, GC 5179, GJ 9150, HD 27290, HIP 19893, HR 1338, SAO 233457, PPM 333343[10]
Database references
SIMBADdata

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.[3] The star is located at a distance of 67 light years from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +25 km/s.[6] Based on its motion through space, it appears to be a member of the IC 2391 supercluster.[12]

This is an F-type main-sequence star with a stellar classification of F1V.[4] It is a pulsating variable that varies in brightness by less than a tenth of a magnitude owing to nonradial gravity wave oscillations.[3] Four pulsation frequencies have been identified with periods of 17.6, 12.8, 16.3, and 18.2 hours.[9][13] 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[7] times the mass of the Sun and 1.9[2] times the Sun's radius. The star is radiating seven[2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,906 K.[2]

An infrared excess has been detected at multiple frequencies,[14] indicating that the star is being orbited by a pair of debris disks.[15]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference kaye99 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference gray_et_al_2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference bsc2 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Esposito_et_al_2020 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Bruntt2008 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Brunsden_et_al_2018 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference sb0 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Kaler was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggen1995 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Balona1994 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Broekhoven-Fiene_et_al_2013 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Greaves_et_al_2014 was invoked but never defined (see the help page).