G Doradus

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G Doradus
Dorado constellation map.svg
Red circle.svg
Location of G Doradus on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension 05h 32m 59.56572s [1]
Declination −64° 13′ 39.0537″ [1]
Apparent magnitude  (V)5.34±0.01 [2]
Characteristics
Spectral type G8/K0 III [3]
U−B color index +0.85 [4]
B−V color index +1.04 [4]
Astrometry
Radial velocity (Rv)9.8±2.8 [5] km/s
Proper motion (μ)RA: +45.741 mas/yr [1]
Dec.: −3.051 mas/yr [1]
Parallax (π)13.9330±0.2335  mas [1]
Distance 234 ± 4  ly
(72 ± 1  pc)
Absolute magnitude  (MV)+1.08 [6]
Orbit [7]
Period (P)180.8757  d
Semi-major axis (a)0.320  AU
Eccentricity (e)0.509±0.010
Inclination (i)52.2±5.2 [8] °
Longitude of the node (Ω)45.4±6.6 [8] °
Periastron epoch (T)2,423,108.42±0.65  JD
Argument of periastron (ω)
(secondary)		332.93±1.61°
Semi-amplitude (K1)
(primary)		22.36±0.35 km/s
Details
A
Mass 3.47 [9]   M☉
Radius 10.5+0.1
−0.2 [1]   R☉
Luminosity 48.4+1.6
−1.5 [1]   L☉
Surface gravity (log g)2.61 [10]   cgs
Temperature 4819±123 [11]   K
Metallicity [Fe/H]−0.20 [12]   dex
Rotational velocity (v sin i)<1.0 [13]  km/s
Age 556+153
−188 [1]   Myr
B
Mass 1.87 [9]   M☉
Other designations
G Dor, 28 G. Doradus [14] , CPD−64°456, FK5 2418, GC 6927, HD 37297, HIP 26001, HR 1917, SAO 249309, TIC 149304313 [15]
Database references
SIMBAD data

G Doradus (HD 37297; HR 1917; 28 G. Doradus) is a spectroscopic binary located in the southern constellation Dorado, the dolphinfish. It has an apparent magnitude of 5.34, [2] making it faintly visible to the naked eye under ideal conditions. The system is located relatively close at a distance of 234 light-years based on Gaia DR3 parallax measurements but it is receding with a heliocentric radial velocity of approximately 9.8  km/s . [5] At its current distance, G Doradus' brightness is diminished by a quarter of a magnitude due to interstellar extinction [16] and it has an absolute magnitude of +1.08. [6] The designation "G Doradus" is not a Bayer designation assigned by Benjamin Gould or Lacaille; it arose from the Gould designation 28 G. Doradus. [17]

The visible component has a stellar classification of G8/K0 III, [3] indicating that it is an evolved star with the characteristics of a G8 and K0 giant star. It has 3.47 times the mass of the Sun [9] but at the age of 556 million years, it has expanded to 10.5 times the radius of the Sun. [1] It radiates 48.4 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,819  K , [11] giving it an orangish-yellow hue when viewed in the night sky. G Doradus is slightly metal deficient with an iron abundance of [Fe/H] = −0.20 [12] and it spins too slowly for its projected rotational velocity to be measured accurately. [13]

G Doradus is a single-lined spectroscopic binary; the components – which have a separation of 0.32 AU – take 181 days to circle each other in an elliptical orbit, but the orbit is not well constrained. [7] Although only the primary can be observed in the spectrum, the masses of both components can be determined. Krachieva et al. (1980) derives a mass of 1.87  M☉ for the companion, [9] which might be an A-type star.

References

  1. 1 2 3 4 5 6 7 8 9 10 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361. S2CID   17128864.
  3. 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
  4. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  6. 1 2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  7. 1 2 Lunt, Joseph (1924). "On the orbits of the seven spectroscopic-binary stars : ί Gruis, θ1 Crucis, 28 Doradus, α Phoenicis, β Doradus, W Velorum, ρ Tucanae". Annals of the Cape Observatory. 10: 7. Bibcode:1924AnCap..10....7L.
  8. 1 2 Jancart, S.; Jorissen, A.; Babusiaux, C.; Pourbaix, D. (September 30, 2005). "Astrometric orbits of SB9 stars". Astronomy & Astrophysics. 442 (1). EDP Sciences: 365–380. arXiv: astro-ph/0507695 . Bibcode:2005A&A...442..365J. doi: 10.1051/0004-6361:20053003 . ISSN   0004-6361. S2CID   55637839.
  9. 1 2 3 4 Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars". Bull. Inf. Centre Données Stellaires. 19: 71. Bibcode:1980BICDS..19...71K. S2CID   118298938.
  10. ↑ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361. S2CID   131780028.
  11. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  12. 1 2 Eggen, Olin J. (January 1989). "Large and Kinematically Unbiased Samples of G- and K-Type Stars. III. Evolved Young Disk Stars in the Bright Star Sample". Publications of the Astronomical Society of the Pacific. 101: 54. Bibcode:1989PASP..101...54E. doi: 10.1086/132404 . eISSN   1538-3873. ISSN   0004-6280. S2CID   122928361.
  13. 1 2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . eISSN   1432-0746. ISSN   0004-6361. S2CID   54046583.
  14. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  15. ↑ "* G Dor". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved September 11, 2023.
  16. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
  17. ↑ Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, VA: The McDonald & Woodward Publishing Company. p. 137. ISBN   978-0-939923-78-6.
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