KINEMATICS AND VELOCITY ELLIPSOID OF THE K GIANTS
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2009
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| _version_ | 1876477005738803200 |
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| author | Richard L. Branham Jr. |
| author_facet | Richard L. Branham Jr. |
| contents | KINEMATICS AND VELOCITY ELLIPSOID OF THE K GIANTS Richard L. Branham Jr. Física, Astronomía y Matemáticas methods: numerical Galaxy: kinematics and dynamics To study the kinematics of the K giant stars (luminosity class III) use is made of proper motions taken from van Leeuwen's new reduction of the Hipparcos catalog. 11,372 stars, of which 880 have radial velocities, were used in the nal study. Semi-denite programming solves for the kinematical parameters such as the Oort constants and simultaneously for the coefficients of the velocity ellipsoid. The condition that both the solution for the solar velocity calculated from the kinematical parameters and from the velocity ellipsoid calculation be the same is enforced. The solution gives: solar velocity of 21:83-0:26 km s-1; Oort's constant's, in units of km s-1 kpc-1, A = 13:08 - 1:72 and B = -10:21 - 1:47, implying a rotational velocity of 197:94 - 44:73 km s-1 if we take the distance to the Galactic center as 8:2-1:1 kpc; velocity dispersions, in units of km s-1, of: -x = 50:58-0:99, -y = 42:42 - 1:13, -z = 32:92 - 0:56 with a vertex deviation of -7:-53 - 3:-º97. 2009 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57112175010 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.2 Vol.45 |
| format | Artículo científico |
| id | redalyc_57112175010 |
| institution | Redalyc |
| language | en |
| publishDate | 2009 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | KINEMATICS AND VELOCITY ELLIPSOID OF THE K GIANTS Richard L. Branham Jr. Física, Astronomía y Matemáticas methods: numerical Galaxy: kinematics and dynamics KINEMATICS AND VELOCITY ELLIPSOID OF THE K GIANTS Richard L. Branham Jr. Física, Astronomía y Matemáticas methods: numerical Galaxy: kinematics and dynamics To study the kinematics of the K giant stars (luminosity class III) use is made of proper motions taken from van Leeuwen's new reduction of the Hipparcos catalog. 11,372 stars, of which 880 have radial velocities, were used in the nal study. Semi-denite programming solves for the kinematical parameters such as the Oort constants and simultaneously for the coefficients of the velocity ellipsoid. The condition that both the solution for the solar velocity calculated from the kinematical parameters and from the velocity ellipsoid calculation be the same is enforced. The solution gives: solar velocity of 21:83-0:26 km s-1; Oort's constant's, in units of km s-1 kpc-1, A = 13:08 - 1:72 and B = -10:21 - 1:47, implying a rotational velocity of 197:94 - 44:73 km s-1 if we take the distance to the Galactic center as 8:2-1:1 kpc; velocity dispersions, in units of km s-1, of: -x = 50:58-0:99, -y = 42:42 - 1:13, -z = 32:92 - 0:56 with a vertex deviation of -7:-53 - 3:-º97. 2009 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57112175010 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.2 Vol.45 |
| title | KINEMATICS AND VELOCITY ELLIPSOID OF THE K GIANTS |
| topic | Física, Astronomía y Matemáticas methods: numerical Galaxy: kinematics and dynamics |
| url | https://www.redalyc.org/articulo.oa?id=57112175010 |