Subdwarf studies. II - Abundances and kinematics from medium resolution spectra. III - The halo metallicity distribution
Stars previously identified as having UV excesses are observed at 1-A resolution in the Ca II K-line region. Comparisons of these data with other samples and with Monte Carlo simulations involving a single component halo have yielded estimates of halo velocity dispersions and rotation velocity, corr...
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| Veröffentlicht in: | The Astronomical journal 1991-05, Vol.101, p.1835-1878 |
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| container_title | The Astronomical journal |
| container_volume | 101 |
| creator | Ryan, Sean G. Norris, John E. |
| description | Stars previously identified as having UV excesses are observed at 1-A resolution in the Ca II K-line region. Comparisons of these data with other samples and with Monte Carlo simulations involving a single component halo have yielded estimates of halo velocity dispersions and rotation velocity, corrected for the kinematic biases in the sample. It is suggested that the data are not consistent with a model in which the halo formed from star formation in a dissipating, collapsing cloud; they are, however, reconcilable with the formation of the halo stars by numerous, independently evolving gas clouds. The metallicity distribution of a sample of 372 kinematically selected halo stars is then constructed, with a view to selection effects in the data. Good agreement is noted between the globular cluster metallicity distribution and a stochastic model with a mean of 10 enrichments /fragment. (O.C.) |
| doi_str_mv | 10.1086/115811 |
| format | Article |
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II - Abundances and kinematics from medium resolution spectra. III - The halo metallicity distribution</title><title>The Astronomical journal</title><description>Stars previously identified as having UV excesses are observed at 1-A resolution in the Ca II K-line region. Comparisons of these data with other samples and with Monte Carlo simulations involving a single component halo have yielded estimates of halo velocity dispersions and rotation velocity, corrected for the kinematic biases in the sample. It is suggested that the data are not consistent with a model in which the halo formed from star formation in a dissipating, collapsing cloud; they are, however, reconcilable with the formation of the halo stars by numerous, independently evolving gas clouds. The metallicity distribution of a sample of 372 kinematically selected halo stars is then constructed, with a view to selection effects in the data. Good agreement is noted between the globular cluster metallicity distribution and a stochastic model with a mean of 10 enrichments /fragment. 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II - Abundances and kinematics from medium resolution spectra. III - The halo metallicity distribution</title><author>Ryan, Sean G. ; Norris, John E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c1924-ea9a0fcca1f8709ac15b141d5a2768572973fffba02d1fd7d315fa3ef4c0ea9c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources</topic><topic>ABUNDANCE</topic><topic>ALKALINE EARTH METALS</topic><topic>CALCIUM</topic><topic>CHEMICAL COMPOSITION</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COMPARATIVE EVALUATIONS</topic><topic>COSMIC GASES</topic><topic>DISTRIBUTION</topic><topic>ELECTROMAGNETIC RADIATION</topic><topic>ELEMENT ABUNDANCE</topic><topic>ELEMENTS</topic><topic>FLUIDS</topic><topic>GALACTIC EVOLUTION</topic><topic>GASES</topic><topic>INTERSTELLAR SPACE</topic><topic>MATHEMATICAL MODELS</topic><topic>METALS</topic><topic>MORPHOLOGY</topic><topic>MOTION</topic><topic>RADIATIONS</topic><topic>RESOLUTION</topic><topic>ROTATION</topic><topic>SPACE</topic><topic>SPATIAL DISTRIBUTION</topic><topic>STAR CLUSTERS</topic><topic>STAR EVOLUTION</topic><topic>STAR MODELS</topic><topic>STARS</topic><topic>ULTRAVIOLET RADIATION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ryan, Sean G.</creatorcontrib><creatorcontrib>Norris, John E.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ryan, Sean G.</au><au>Norris, John E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Subdwarf studies. II - Abundances and kinematics from medium resolution spectra. III - The halo metallicity distribution</atitle><jtitle>The Astronomical journal</jtitle><date>1991-05</date><risdate>1991</risdate><volume>101</volume><spage>1835</spage><epage>1878</epage><pages>1835-1878</pages><issn>0004-6256</issn><eissn>1538-3881</eissn><abstract>Stars previously identified as having UV excesses are observed at 1-A resolution in the Ca II K-line region. Comparisons of these data with other samples and with Monte Carlo simulations involving a single component halo have yielded estimates of halo velocity dispersions and rotation velocity, corrected for the kinematic biases in the sample. It is suggested that the data are not consistent with a model in which the halo formed from star formation in a dissipating, collapsing cloud; they are, however, reconcilable with the formation of the halo stars by numerous, independently evolving gas clouds. The metallicity distribution of a sample of 372 kinematically selected halo stars is then constructed, with a view to selection effects in the data. Good agreement is noted between the globular cluster metallicity distribution and a stochastic model with a mean of 10 enrichments /fragment. (O.C.)</abstract><cop>United States</cop><doi>10.1086/115811</doi><tpages>44</tpages></addata></record> |
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| ispartof | The Astronomical journal, 1991-05, Vol.101, p.1835-1878 |
| issn | 0004-6256 1538-3881 |
| language | eng |
| recordid | cdi_osti_scitechconnect_5394056 |
| source | EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ABUNDANCE ALKALINE EARTH METALS CALCIUM CHEMICAL COMPOSITION CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COMPARATIVE EVALUATIONS COSMIC GASES DISTRIBUTION ELECTROMAGNETIC RADIATION ELEMENT ABUNDANCE ELEMENTS FLUIDS GALACTIC EVOLUTION GASES INTERSTELLAR SPACE MATHEMATICAL MODELS METALS MORPHOLOGY MOTION RADIATIONS RESOLUTION ROTATION SPACE SPATIAL DISTRIBUTION STAR CLUSTERS STAR EVOLUTION STAR MODELS STARS ULTRAVIOLET RADIATION |
| title | Subdwarf studies. II - Abundances and kinematics from medium resolution spectra. III - The halo metallicity distribution |
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