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Lambda Doradus

From Wikipedia, the free encyclopedia
Star in the constellation of Dorado
λ Doradus
Location of λ Doradus on the map (circled)
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationDorado
Right ascension05h 26m 19.26577s[1]
Declination−58° 54′ 45.06402″[1]
Apparent magnitude (V)5.13±0.01[2]
Characteristics
Evolutionary stagered giant branch[3]
Spectral typeG6 III[4] or G8 III[5]
B−Vcolor index+1.00[6]
Astrometry
Radial velocity (Rv)10±0.07[7] km/s
Proper motion (μ)RA: −9.792mas/yr[1]
Dec.: +33.350mas/yr[1]
Parallax (π)5.9209±0.0712 mas[1]
Distance551 ± 7 ly
(169 ± 2 pc)
Absolute magnitude (MV)−0.6[8]
Details[9]
Mass3.82±0.16 M
Radius21.1±0.5 R
Luminosity252±L
Surface gravity (log g)2.41±0.12 cgs
Temperature5,009±43 K
Metallicity[Fe/H]−0.06±0.04 dex
Rotational velocity (v sin i)5.2±1[10] km/s
Age258[11] Myr
Other designations
λ Dor,23 G. Doradus[12],CPD−59°472,FK5 2410,GC 6749,HD 36189,HIP 25429,HR 1836,SAO 233981[13]
Database references
SIMBADdata

Lambda Doradus (Lambda Dor),Latinized fromλ Doradus, is a solitary[14] yellow huedstar located in the southernconstellationDorado. It has anapparent magnitude of 5.13,[2] making it faintly visible to thenaked eye if viewed under ideal conditions.Parallax measurements place the star at a distance of 551light years,[1] and it is currently receding with a heliocentricradial velocity of10 km/s.[7]

Lambda Dor has astellar classification of either G6[4] or G8 III,[5] depending on the source. Nevertheless, both indicate that it is ared giant, and it is currently on thered giant branch fusing hydrogen in a shell outside a helium core.[3] At present it has 3.82 times themass of the Sun[9] and at an age of 258million years, it has expanded to aradius of 21.2 R.[9] It radiates at over 250 times theluminosity of the Sun from itsphotosphere at aneffective temperature of5,009 K.[9] Lambda Dor is slightly metal deficient, with aniron abundance 12% below solar levels.[9] It currently spins with aprojected rotational velocity of5.2 km/s.[10]

References

[edit]
  1. ^abcdeVallenari, 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 atVizieR.
  2. ^abHøg, 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.
  3. ^abSetiawan, J.; Pasquini, L.; da Silva, L.; von der Lühe, O.; Hatzes, A. (January 2003)."Precise radial velocity measurements of G and K giants".Astronomy & Astrophysics.397 (3):1151–1159.Bibcode:2003A&A...397.1151S.doi:10.1051/0004-6361:20021559.eISSN 1432-0746.ISSN 0004-6361.
  4. ^abHouk, N.; Cowley, A. P. (1975).University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°.Bibcode:1975mcts.book.....H.
  5. ^abKeenan, Philip C.; McNeil, Raymond C. (October 1989)."The Perkins catalog of revised MK types for the cooler stars".The Astrophysical Journal Supplement Series.71: 245.Bibcode:1989ApJS...71..245K.doi:10.1086/191373.eISSN 1538-4365.ISSN 0067-0049.
  6. ^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.
  7. ^abJofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (26 January 2015)."Stellar parameters and chemical abundances of 223 evolved stars with and without planets".Astronomy & Astrophysics.574: A50.arXiv:1410.6422.Bibcode:2015A&A...574A..50J.doi:10.1051/0004-6361/201424474.eISSN 1432-0746.ISSN 0004-6361.
  8. ^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.
  9. ^abcdeOttoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022)."CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars".Astronomy & Astrophysics.657: A87.arXiv:2201.01528.Bibcode:2022A&A...657A..87O.doi:10.1051/0004-6361/202040078.eISSN 1432-0746.ISSN 0004-6361.
  10. ^abDe 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".Astronomy & Astrophysics.561: A126.arXiv:1312.3474.Bibcode:2014A&A...561A.126D.doi:10.1051/0004-6361/201220762.eISSN 1432-0746.ISSN 0004-6361.
  11. ^Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021)."Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample".Astronomy & Astrophysics.646: A77.arXiv:2012.10199.Bibcode:2021A&A...646A..77G.doi:10.1051/0004-6361/202039765.eISSN 1432-0746.ISSN 0004-6361.
  12. ^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.
  13. ^"lam Dor".SIMBAD.Centre de données astronomiques de Strasbourg. RetrievedAugust 21, 2022.
  14. ^Eggleton, P. P.; Tokovinin, A. A. (11 September 2008)."A catalogue of multiplicity among bright stellar systems".Monthly Notices of the Royal Astronomical Society.389 (2):869–879.arXiv:0806.2878.Bibcode:2008MNRAS.389..869E.doi:10.1111/j.1365-2966.2008.13596.x.eISSN 1365-2966.ISSN 0035-8711.
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