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Variable star in the constrellation Hydrus
γ Hydri , Latinised as Gamma Hydri , is a solitary,[9] star in the constellation Hydrus . It has an apparent visual magnitude of 3.26,[2] parallax shift of 15.24 mas as measured from Earth,[1] light-years from the Sun .
This is an evolved red giant star with a stellar classification of M1 III,[3] asymptotic giant branch of the HR diagram .[10] semiregular variable that pulsates between magnitudes 3.26 and 3.33, although its period is not known precisely.[11] mass as the Sun , but has expanded to around 62 times the Sun's radius . The star is radiating 513 times the Sun's luminosity from its enlarged photosphere at an effective temperature of K [7]
References [ edit ]
^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664, arXiv :0708.1752 Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 . ^ a b Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues , 2237 , Bibcode :2002yCat.2237....0D . ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode :1978mcts.book.....H . ^ a b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99, Bibcode :1966CoLPL...4...99J . ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics , 546 : 14, arXiv :1208.3048 Bibcode :2012A&A...546A..61D , doi :10.1051/0004-6361/201219219 , S2CID 59451347 , A61. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics , 430 : 303–311, arXiv :astro-ph/0409683 Bibcode :2005A&A...430..303C , doi :10.1051/0004-6361:20041440 , S2CID 12136256 . ^ a b Cruzalèbes, P.; et al. (September 2013), "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER", Monthly Notices of the Royal Astronomical Society , 434 (1): 437–450, arXiv :1306.3288 Bibcode :2013MNRAS.434..437C , doi :10.1093/mnras/stt1037 , S2CID 49573767 . ^ "gam Hyi" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-08-18 .{{cite web }}: CS1 maint: postscript (link )^ Eggleton, P. P.; Tokovinin, A. A. (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 , S2CID 14878976 . ^ Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal , 104 : 275, Bibcode :1992AJ....104..275E , doi :10.1086/116239 . ^ Tabur, V.; Bedding, T. R. ; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (2009), "Long-term Photometry and Periods for 261 Nearby Pulsating M Giants", Monthly Notices of the Royal Astronomical Society , 400 (4): 1945–61, arXiv :0908.3228 Bibcode :2009MNRAS.400.1945T , doi :10.1111/j.1365-2966.2009.15588.x , S2CID 15358380 .
