DISTANCE AND KINEMATICS OF THE TW HYDRAE ASSOCIATION FROM PARALLAXES
From common proper motion and signatures of youth, researchers have identified about 30 members of a putative TW Hydrae Association. Only four of these had parallactic distances from Hipparcos. We have measured parallaxes and proper motions for 14 primary members. We combine these with literature va...
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| Veröffentlicht in: | The Astrophysical journal 2013-01, Vol.762 (2), p.1-10 |
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| creator | Weinberger, Alycia J Anglada-Escude, Guillem Boss, Alan P |
| description | From common proper motion and signatures of youth, researchers have identified about 30 members of a putative TW Hydrae Association. Only four of these had parallactic distances from Hipparcos. We have measured parallaxes and proper motions for 14 primary members. We combine these with literature values of radial velocities to show that the Galactic space motions of the stars, with the exception of TWA 9 and 22, are parallel and do not indicate convergence at a common formation point sometime in the last few million years. The space motions of TWA 9 and 22 do not agree with the others and indicate that they are not TWA members. The median parallax is 18 mas or 56 pc. We further analyze the stars' absolute magnitudes on pre-main-sequence evolutionary tracks and find a range of ages with a median of 10.1 Myr and no correlation between age and Galactic location. The TWA stars may have formed from an extended and filamentary molecular cloud but are not necessarily precisely coeval. |
| doi_str_mv | 10.1088/0004-637X/762/2/118 |
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The TWA stars may have formed from an extended and filamentary molecular cloud but are not necessarily precisely coeval.</description><subject>ASTRONOMY</subject><subject>ASTROPHYSICS</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Convergence</subject><subject>CORRELATIONS</subject><subject>DISTANCE</subject><subject>Evolutionary</subject><subject>Kinematics</subject><subject>MAIN SEQUENCE STARS</subject><subject>MILKY WAY</subject><subject>Molecular clouds</subject><subject>Parallax</subject><subject>PROPER MOTION</subject><subject>PROTOSTARS</subject><subject>RADIAL VELOCITY</subject><subject>Signatures</subject><subject>SPACE</subject><subject>Stars</subject><subject>Stellar age</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNkc9PgzAYhhujiXP6F3gh8eIF6Q9a2mMDzBE3MAPjPDVdVyJmG0rZwf9eyIxnT1--vE_ew_sAcIvgA4KcBxDC0GckWgcRwwEOEOJnYIIo4X5IaHQOJn_EJbhy7mN8sRATkCRZWck8Tj2ZJ95TlqdLWWVx6RUzr5qnXvXqzd-SlRzysizibAiL3JutiqX3LFdysZDrtLwGF7XeOXvze6fgZZZW8dxfFI9ZLBe-CWnY-5oZQ-oNNkIgHmkUWkM31GgjKGWWcaqp0LDebvUGIctCwrCOakZQWDMMuSBTcHfqbV3fKGea3pp30x4O1vQKY8QiTPhA3Z-oz679OlrXq33jjN3t9MG2R6dQhLjAJOL0HygUiFFG8YCSE2q61rnO1uqza_a6-1YIqlGCGjdV48RqkKCwGiSQHy4DceI</recordid><startdate>20130110</startdate><enddate>20130110</enddate><creator>Weinberger, Alycia J</creator><creator>Anglada-Escude, Guillem</creator><creator>Boss, Alan P</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20130110</creationdate><title>DISTANCE AND KINEMATICS OF THE TW HYDRAE ASSOCIATION FROM PARALLAXES</title><author>Weinberger, Alycia J ; Anglada-Escude, Guillem ; Boss, Alan P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c454t-a6cc3fb2c99187a14ec5b5cac9556e685a59a0fddab11e64362a7f6314f620893</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>ASTRONOMY</topic><topic>ASTROPHYSICS</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>Convergence</topic><topic>CORRELATIONS</topic><topic>DISTANCE</topic><topic>Evolutionary</topic><topic>Kinematics</topic><topic>MAIN SEQUENCE STARS</topic><topic>MILKY WAY</topic><topic>Molecular clouds</topic><topic>Parallax</topic><topic>PROPER MOTION</topic><topic>PROTOSTARS</topic><topic>RADIAL VELOCITY</topic><topic>Signatures</topic><topic>SPACE</topic><topic>Stars</topic><topic>Stellar age</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Weinberger, Alycia J</creatorcontrib><creatorcontrib>Anglada-Escude, Guillem</creatorcontrib><creatorcontrib>Boss, Alan P</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Weinberger, Alycia J</au><au>Anglada-Escude, Guillem</au><au>Boss, Alan P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>DISTANCE AND KINEMATICS OF THE TW HYDRAE ASSOCIATION FROM PARALLAXES</atitle><jtitle>The Astrophysical journal</jtitle><date>2013-01-10</date><risdate>2013</risdate><volume>762</volume><issue>2</issue><spage>1</spage><epage>10</epage><pages>1-10</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>From common proper motion and signatures of youth, researchers have identified about 30 members of a putative TW Hydrae Association. 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| subjects | ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Convergence CORRELATIONS DISTANCE Evolutionary Kinematics MAIN SEQUENCE STARS MILKY WAY Molecular clouds Parallax PROPER MOTION PROTOSTARS RADIAL VELOCITY Signatures SPACE Stars Stellar age |
| title | DISTANCE AND KINEMATICS OF THE TW HYDRAE ASSOCIATION FROM PARALLAXES |
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