Gamma Doradus

In today's article we will explore Gamma Doradus, a topic that has been the subject of interest in different areas and that has sparked debates and reflections in different areas. Gamma Doradus has captured the attention of experts and the general public, generating endless opinions and perspectives around its relevance and impact. Throughout this article, we will examine different approaches and opinions on Gamma Doradus, exploring its importance, its evolution over time and its influence on various aspects of society. Join us on this journey through the world of Gamma Doradus and discover the multiple facets and possible interpretations that this theme presents.

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 +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 167.1, 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]

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ a b c d e f Kaye, Anthony B.; et al. (July 1999). "Gamma Doradus Stars: Defining a New Class of Pulsating Variables". Publications of the Astronomical Society of the Pacific. 111 (761): 840–844. arXiv:astro-ph/9905042. Bibcode:1999PASP..111..840K. doi:10.1086/316399. S2CID 15583148.
  4. ^ a b Gray, R. O.; et al. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
  5. ^ a b c Hoffleit, D.; Warren, Jr., W. H. "HR 1338, database entry". The Bright Star Catalogue (5th Revised ed.). "V/50". CDS. Retrieved November 17, 2008.
  6. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. ^ a b c Esposito, Thomas M.; et al. (July 2020). "Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign". The Astronomical Journal. 160 (1): 44. arXiv:2004.13722. Bibcode:2020AJ....160...24E. doi:10.3847/1538-3881/ab9199. S2CID 216641889. 24.
  8. ^ a b Bruntt, H.; et al. (February 2008). "A spectroscopic study of southern (candidate) γ Doradus stars. II. Detailed abundance analysis and fundamental parameters". Astronomy and Astrophysics. 478 (2): 487–496. arXiv:0711.3819. Bibcode:2008A&A...478..487B. doi:10.1051/0004-6361:20078523. S2CID 2713381.
  9. ^ a b c Brunsden, E.; et al. (April 2018). "Frequency and mode identification of γ Doradus from photometric and spectroscopic observations*". Monthly Notices of the Royal Astronomical Society. 475 (3): 3813–3822. arXiv:1803.06890. Bibcode:2018MNRAS.475.3813B. doi:10.1093/mnras/sty034.
  10. ^ "gam Dor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-16.
  11. ^ Kaler, James B. "Gamma Dor". Stars. Retrieved 2020-11-16.
  12. ^ Eggen, Olin J. (December 1995). "Reality Tests of Superclusters in the Young Disk Population". Astronomical Journal. 110: 2862. Bibcode:1995AJ....110.2862E. doi:10.1086/117734.
  13. ^ Balona, L. A.; Krisciunas, K.; Cousins, A. W. J. (October 15, 1994). "γ Doradus: evidence for a new class of pulsating star". Monthly Notices of the Royal Astronomical Society. 270 (4): 905–913. Bibcode:1994MNRAS.270..905B. doi:10.1093/mnras/270.4.905.
  14. ^ Broekhoven-Fiene, Hannah; et al. (January 2013). "The Debris Disk around γ Doradus Resolved with Herschel". The Astrophysical Journal. 762 (1): 11. arXiv:1212.1450. Bibcode:2013ApJ...762...52B. doi:10.1088/0004-637X/762/1/52. S2CID 119276423. 52.
  15. ^ Greaves, J. S.; et al. (February 2014). "Alignment in star-debris disc systems seen by Herschel". Monthly Notices of the Royal Astronomical Society: Letters. 438 (1): L31 – L35. arXiv:1310.6936. Bibcode:2014MNRAS.438L..31G. doi:10.1093/mnrasl/slt153.