Theta Hydrae

Theta Hydrae
	estrella, estrella doble (es) , near-IR source (en) y UV-emission source (en)
Datos d'observación
Ascensión reuta (α)	138,59108362982 °
Declinación (δ)	2,3143199766406 °
Distancia a la Tierra	36,9407 pc
Magnitú aparente (V)	3,9 (Banda R (es) ); 3,82 (Banda B (es) ); 3,455 (Banda J (es) ); 4,04 (Banda H (es) ); 3,943 (Banda K (es) ); 3,881347 (Banda G (es) )
Magnitú absoluta	0,92
Constelación	Hidra
Velocidá de rotación	97 km/s
Velocidá radial	−10,7 km/s
Parallax	27,0704 mas
Carauterístiques físiques
Radiu	1,6 Radius solars
Masa	2,52 M☉
Gravedá superficial	1700 cm/s²
Tipu espectral	B9.5V+DA1.6
Otros nomes
	Ver llista SAO 117527 (Catálogu SAO); HD 79469 (Catálogu Henry Draper); HIP 45336 (Catálogu Hipparcos); HR 3665 (Bright Star Catalogue); IRAS 09117+0231 (IRAS (es) ); 2MASS J09142189+0218511 (2MASS (es) ); GSC 00227-02544 (Guide Star Catalog (es) ); θ Hya (Denominación de Bayer); ADS 7253 A (Aitken Double Star Catalogue (en) ); PLX 2200 (General Catalogue of Trigonometric Stellar Parallaxes (es) ); LSPM J0914+0218 (LSPM-NORTH catalog (en) ); ASCC 1130574 (All-sky Compiled Catalogue (en) ); BD+02 2167 (Bonner Durchmusterung); CCDM J09144+0219A (Catalog of Components of Double and Multiple Stars (en) ); FK5 347 (FK5 (en) ); GC 12743 (Boss General Catalogue (es) ); GCRV 6036 (General Catalogue of Stellar Radial Velocities (es) ); HIC 45336 (Hipparcos Input Catalogue (en) ); IDS 09092+0244 A (Index Catalogue of Visual Double Stars (en) ); JP11 1787 (JP11 (en) ); LTT 12431 (Luyten Two-Tenths catalogue (en) ); N30 2190 (Catalog of 5,268 Standard Stars Based on the Normal System N30 (en) ); NLTT 21281 (New Luyten Two-Tenths catalogue (en) ); PMC 90-93 250 (Tokyo Photoelectric Meridian Circle Catalog (en) ); PPM 155592 (Catálogo de estrellas PPM (es) ); ROT 1453 (Catalogue of rotational velocities of the stars (en) ); TD1 13698 (TD1 Catalog of Stellar Ultraviolet Fluxes (en) ); TYC 227-2544-1 (Tycho Catalogue (en) ); UBV 8842 (UBV Photoelectric Photometry Catalogue (en) ); YZ 2 3711 (Yale Observatory Zone Catalog (en) ); uvby98 100079469 (uvbyβ Photoelectric Photometric Catalogue (en) ); PLX 2200.00 (General Catalogue of Trigonometric Stellar Parallaxes (es) ); 2EUVE J0914+02.3 (The second Extreme Ultraviolet Explorer source catalog (en) ); EUVE J0914+02.3 (The first Extreme Ultraviolet Explorer source catalog (en) ); 1RXS J091422.0+021916 (1RXS (en) ); WDS J09144+0219A (Catálogo de Estrellas Dobles Washington (es) ); RX J0914.3+0219 (X-ray survey of the Large Magellanic Cloud by ROSAT (en) ); [ZEH2003] RX J0914.3+0219 1 (The Hamburg/RASS Catalogue of optical identifications. Northern high-galactic latitude ROSAT Bright Source Catalogue X-ray sources (en) ); WEB 8635 (Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue (en) ); Gaia DR2 3845263368043086080 (Gaia DR2 (es) ); 22 Hya (Denominación de Flamsteed (es) ); TIC 430415842 (TESS Input Catalog (en) ); Gaia DR3 3845263368043470080 (Gaia DR3 (es) ); AG+02 1244 (AGK3U (en) ); UBV M 15207 (UBV Photoelectric Photometry Catalogue (en) ); Renson 22550 (General catalogue of AP and AM stars (en) );

Coordenaes: 9^h 14^m 21.86^s, 2^° 18^′ 51.552^″

Theta Hydrae (θ Hya / HD 79469 / HR 3665)^[7] ye una estrella na constelación de la Hidra de magnitú aparente +3,88. Alcuéntrase a 129 años lluz del Sistema Solar.

Theta Hydrae ye una estrella de la secuencia principal de tipu espectral B9.5V, asemeyáu a β Sculptoris o ζ Coronae Australis. Tien una temperatura efectivo de 10.099 ± 145 K^[8] y, a partir de la midida del so diámetru angular —0,490 milisegundos d'arcu—,^[9] puede conocese el so radiu, que ye aproximao'l doble que'l radiu solar. Como otres estrelles asemeyaes, xira sobre sigo mesma rápido, con una velocidá de rotación de siquier 82 km/s,^[10] unes 40 vegaes más apriesa que'l Sol. El so campu magnéticu efectivu <B_y> ye de 126 G.^[11]

Tocantes a la so composición elemental, tien una metalicidá claramente inferior a la solar, con una bayura relativa de fierro en redol al 40% de la solar ([Fe/H] = -0,42). Otru estudiu, sicasí, señala un conteníu metálico menos desemeyáu, con niveles de sodiu y fierro en redol a los valores solares.^[10] Tien una edá averada de 180 millones d'años.^[12]

Referencies

1 2 3 4 Afirmao en: SIMBAD.
1 2 3 Afirmao en: Gaia EDR3. Stated in source according to: SIMBAD. Llingua de la obra o nome: inglés. Data d'espublización: 3 avientu 2020.
↑ «Rotational velocities of A-type stars» (n'inglés). Astronomy and Astrophysics (2): páxs. 671–682. febreru 2007. doi:10.1051/0004-6361:20065224.
↑ «Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system» (n'inglés). Astronomy Letters (11): páxs. 759–771. payares 2006. doi:10.1134/S1063773706110065.
↑ «Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library» (n'inglés). Astronomy and Astrophysics: páxs. A143. febreru 2012. doi:10.1051/0004-6361/201118065.
↑ Matthew R. Burleigh (13 setiembre 2013). «Where are all the Sirius-like binary systems?» (n'inglés). Monthly Notices of the Royal Astronomical Society (3): páxs. 2077–2091. doi:10.1093/MNRAS/STT1433.
↑ LTT 12431 -- High proper-motion Star (SIMBAD)
↑ Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2011). «Coudé-feed stellar spectral library - atmospheric parameters». Astronomy and Astrophysics 525. A71. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2011A%26A...525A..71W&db_key=AST&nosetcookie=1.
↑ Zorec, J.; Cidale, L.; Arias, M. L.; Frémat, Y.; Muratore, M. F.; Torres, A. F.; Martayan, C. (2009). «Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff». Astronomy and Astrophysics 501 (1). páxs. 297-320. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009A%26A...501..297Z&db_key=AST&nosetcookie=1.
1 2 Takeda, Yoichi; Kang, Dong-Il; Han, Inwoo; Lee, Byeong-Cheol; Kim, Kang-Min (2009). «Can Sodium Abundances of A-Type Stars Be Reliably Determined from Na I 5890/5896 Lines?». Publications of the Astronomical Society of Japan 61 (5). páxs. 1165-1178. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009PASJ...61.1165T&db_key=AST&nosetcookie=1.
↑ Bychkov, V. D.; Bychkova, L. V.; Madej, J. (2003). «Catalogue of averaged stellar effective magnetic fields. I. Chemically peculiar A and B type stars». Astronomy and Astrophysics 407. páxs. 631-642. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=J/A%2bA/407/631/tablea1&recno=126.
↑ Su, K. Y. L.; Rieke, G. H.; Stansberry, J. A.; Bryden, G.; Stapelfeldt, K. R.; Trilling, D. E.; Muzerolle, J.; Beichman, C. A.; Moro-Martin, A.; Hines, D. C.; Werner, M. W. (2006). «Debris Disk Evolution around A Stars». The Astrophysical Journal 653 (1). páxs. 675-689. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2006ApJ...653..675S&db_key=AST&nosetcookie=1.

Coordenaes: 9^h 14^m 21.86^s, 2^° 18^′ 51.552^″

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[8ba559d5760a03bedaaacc3c347bbfe4981560bf-1] 1 2 3 4 Afirmao en: SIMBAD.

[88f46fab9cce60c7e274ff942763157775017282-2] 1 2 3 Afirmao en: Gaia EDR3. Stated in source according to: SIMBAD. Llingua de la obra o nome: inglés. Data d'espublización: 3 avientu 2020.

[0c2b03154767959eab917db9a35da11df417ba36-3] «Rotational velocities of A-type stars» (n'inglés). Astronomy and Astrophysics (2): páxs. 671–682. febreru 2007. doi:10.1051/0004-6361:20065224.

[e4ae596e5e49019b6148474aa8b1d0498039646f-4] «Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system» (n'inglés). Astronomy Letters (11): páxs. 759–771. payares 2006. doi:10.1134/S1063773706110065.

[ca9a66db4803ddcd6c9fd949a921bc14bbdd1d9e-5] «Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library» (n'inglés). Astronomy and Astrophysics: páxs. A143. febreru 2012. doi:10.1051/0004-6361/201118065.

[42252234f13aae9b7937bcbc357616002d674b68-6] Matthew R. Burleigh (13 setiembre 2013). «Where are all the Sirius-like binary systems?» (n'inglés). Monthly Notices of the Royal Astronomical Society (3): páxs. 2077–2091. doi:10.1093/MNRAS/STT1433.

[SIMBAD-7] LTT 12431 -- High proper-motion Star (SIMBAD)

[Wu-8] Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2011). «Coudé-feed stellar spectral library - atmospheric parameters». Astronomy and Astrophysics 525. A71. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2011A%26A...525A..71W&db_key=AST&nosetcookie=1.

[Zorec-9] Zorec, J.; Cidale, L.; Arias, M. L.; Frémat, Y.; Muratore, M. F.; Torres, A. F.; Martayan, C. (2009). «Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff». Astronomy and Astrophysics 501 (1). páxs. 297-320. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009A%26A...501..297Z&db_key=AST&nosetcookie=1.

[Takeda-Na-10] 1 2 Takeda, Yoichi; Kang, Dong-Il; Han, Inwoo; Lee, Byeong-Cheol; Kim, Kang-Min (2009). «Can Sodium Abundances of A-Type Stars Be Reliably Determined from Na I 5890/5896 Lines?». Publications of the Astronomical Society of Japan 61 (5). páxs. 1165-1178. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009PASJ...61.1165T&db_key=AST&nosetcookie=1.

[11] Bychkov, V. D.; Bychkova, L. V.; Madej, J. (2003). «Catalogue of averaged stellar effective magnetic fields. I. Chemically peculiar A and B type stars». Astronomy and Astrophysics 407. páxs. 631-642. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=J/A%2bA/407/631/tablea1&recno=126.

[su-12] Su, K. Y. L.; Rieke, G. H.; Stansberry, J. A.; Bryden, G.; Stapelfeldt, K. R.; Trilling, D. E.; Muzerolle, J.; Beichman, C. A.; Moro-Martin, A.; Hines, D. C.; Werner, M. W. (2006). «Debris Disk Evolution around A Stars». The Astrophysical Journal 653 (1). páxs. 675-689. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2006ApJ...653..675S&db_key=AST&nosetcookie=1.

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