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Double star system in the constellation Hydra
Delta Hydrae , Latinized from δ Hydrae, is a double star in the equatorial constellation of Hydra . It is visible to the naked eye with an apparent visual magnitude of 4.146.[2] parallax shift of 20.34 mas , it is located about 160 light years from the Sun .
This is a double star [10] ± 0.1 arc secondposition angle of ± 1.0°[11] A-type main sequence star with a stellar classification of A1 Vnn.[3] projected rotational velocity of 285 km/s. This is giving the star an oblate shape with an equatorial bulge that is 20% larger than the polar radius.[3] [6] mass of the Sun and 2.7[7] Sun's radius .[7] [8] solar luminosity from its outer atmosphere at an effective temperature of 11,055 K.[6]
The companion has a visual magnitude of 11.15.[10] X-ray emissions have been detected from this location in space, which may be coming from a companion star.[11]
Name and etymology
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In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket , this star was designated Lisan al Shudja , which was translated into Latin as Lingua Hydri , meaning the snake's tongue .[12] ε Hya , ζ Hya , η Hya , ρ Hya and σ Hya (Minchir), were Ulugh Beg 's Min al Azʽal , "Belonging to the Uninhabited Spot".[13]
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars , Min al Azʽal or Minazal were the title for five stars :δ Hya as Minazal I , η Hya as Minazal II , ε Hya as Minazal III , ρ Hya as Minazal IV and ζ Hya as Minazal V (exclude σ Hya )[14]
In Chinese , 柳宿 Liǔ Sù Willow (asterism)σ Hydrae , η Hydrae , ρ Hydrae , ε Hydrae , ζ Hydrae , ω Hydrae and θ Hydrae [15] 柳宿一 Liǔ Sù yī the First Star of Willow .)[16]
The people of Groote Eylandt called Unwala , "The Crab", for the star cluster including this star, ε Hya , ζ Hya , η Hya , ρ Hya and σ Hya (Minchir).[17]
References
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^ a b c d Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars , 8 Bibcode :1984SAAOC...8...59C .
^ a b c d Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review , 20 1 ): 51, arXiv :1204.2572 Bibcode :2012A&ARv..20...51V , doi :10.1007/s00159-012-0051-2 , S2CID 119273474 .
^ 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.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 5 ): 331, arXiv :1108.4971 Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 .
^ a b c d e David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal , 804 (2 ): 146, arXiv :1501.03154 Bibcode :2015ApJ...804..146D , doi :10.1088/0004-637X/804/2/146 , S2CID 33401607 .
^ a b c Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics , 367 (2 ) (3rd ed.): 521–24, arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P , doi :10.1051/0004-6361:20000451 , S2CID 425754 .
^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society , 427 (1 ): 343–57, arXiv :1208.2037 Bibcode :2012MNRAS.427..343M , doi :10.1111/j.1365-2966.2012.21873.x , S2CID 118665352 .
^ "* del Hya" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-01-03 .
^ a b Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog" , The Astronomical Journal , 122 (6 ): 3466, Bibcode :2001AJ....122.3466M , doi :10.1086/323920 , retrieved 2015-07-22
^ a b De Rosa, R. J.; et al. (July 2011), "The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars", Monthly Notices of the Royal Astronomical Society , 415 (1 ): 854–866, arXiv :1103.4363 Bibcode :2011MNRAS.415..854D , doi :10.1111/j.1365-2966.2011.18765.x , S2CID 84181878 .
^ Knobel, E. B. (June 1895), "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket", Monthly Notices of the Royal Astronomical Society 55 Bibcode :1895MNRAS..55..429K , doi :10.1093/mnras/55.8.429
^ Allen, R. H. (1963), Star Names: Their Lore and Meaning 249 , ISBN 0-486-21079-0 , retrieved 2010-12-12 .
^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars , Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
^ (in Chinese) 中國星座神話 , written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7 .
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年5 月28 日
^ Helaine Selin , ed., Encyclopaedia of the history of science, technology, and medicine in non-western cultures , Dordrecht, Kluwer Academic Publishers, 1997, p.105 .
External links
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Kaler, James B. (April 13, 2012), "Delta Hydrae" , STARS , University of Illinois, retrieved 2017-01-03 .
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Delta_Hydrae&oldid=1117351202 " C a t e g o r i e s : ● A - t y p e m a i n - s e q u e n c e s t a r s ● B a y e r o b j e c t s ● H y d r a ( c o n s t e l l a t i o n ) ● F l a m s t e e d o b j e c t s ● H e n r y D r a p e r C a t a l o g u e o b j e c t s ● H i p p a r c o s o b j e c t s ● B r i g h t S t a r C a t a l o g u e o b j e c t s ● D u r c h m u s t e r u n g o b j e c t s ● S t a r s w i t h p r o p e r n a m e s H i d d e n c a t e g o r i e s : ● A r t i c l e s w i t h C h i n e s e - l a n g u a g e s o u r c e s ( zh ) ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n i s d i f f e r e n t f r o m W i k i d a t a ● A r t i c l e s c o n t a i n i n g C h i n e s e - l a n g u a g e t e x t ● A r t i c l e s c o n t a i n i n g e x p l i c i t l y c i t e d E n g l i s h - l a n g u a g e t e x t
● T h i s p a g e w a s l a s t e d i t e d o n 2 1 O c t o b e r 2 0 2 2 , a t 0 7 : 1 7 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
