New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey

<!DOCTYPE html>     <html class="no-js" lang="en">  <head> <title>New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey - NASA/ADS</title>  <link rel="apple-touch-icon" sizes="180x180" href="//styles/favicon/apple-touch-icon.png" /> <link rel="icon" type="image/png" sizes="32x32" href="//styles/favicon/favicon-32x32.png" /> <link rel="icon" type="image/png" sizes="16x16" href="//styles/favicon/favicon-16x16.png" /> <link rel="manifest" href="//styles/favicon/site.webmanifest" /> <link rel="mask-icon" href="//styles/favicon/safari-pinned-tab.svg" color="#5bbad5" /> <meta name="apple-mobile-web-app-title" content="NASA ADS" /> <meta name="application-name" content="NASA ADS" /> <meta name="msapplication-TileColor" content="#ffc40d" /> <meta name="theme-color" content="#ffffff" />  <link rel="stylesheet" href="/styles/css/styles.css"> <meta name="robots" content="noarchive"> <link rel="canonical" href="http://ui.adsabs.harvard.edu/abs/2011A&A...530A.138C/abstract"/> <meta name="description" content="We present a re-analysis of the Geneva-Copenhagen survey, which benefits from the infrared flux method to improve the accuracy of the derived stellar effective temperatures and uses the latter to build a consistent and improved metallicity scale. Metallicities are calibrated on high-resolution spectroscopy and checked against four open clusters and a moving group, showing excellent consistency. The new temperature and metallicity scales provide a better match to theoretical isochrones, which are used for a Bayesian analysis of stellar ages. With respect to previous analyses, our stars are on average 100 K hotter and 0.1 dex more metal rich, which shift the peak of the metallicity distribution function around the solar value. From Str枚mgren photometry we are able to derive for the first time a proxy for [伪/Fe] abundances, which enables us to perform a tentative dissection of the chemical thin and thick disc. We find evidence for the latter being composed of an old, mildly but systematically alpha-enhanced population that extends to super solar metallicities, in agreement with spectroscopic studies. Our revision offers the largest existing kinematically unbiased sample of the solar neighbourhood that contains full information on kinematics, metallicities, and ages and thus provides better constraints on the physical processes relevant in the build-up of the Milky Way disc, enabling a better understanding of the Sun in a Galactic context. <P />Catalogue (Table 2) is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138</A>">  <meta property="og:type" content="article"> <meta property="og:title" content="New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey"> <meta property="og:site_name" content="NASA/ADS"> <meta property="og:description" content="We present a re-analysis of the Geneva-Copenhagen survey, which benefits from the infrared flux method to improve the accuracy of the derived stellar effective temperatures and uses the latter to build a consistent and improved metallicity scale. Metallicities are calibrated on high-resolution spectroscopy and checked against four open clusters and a moving group, showing excellent consistency. The new temperature and metallicity scales provide a better match to theoretical isochrones, which are used for a Bayesian analysis of stellar ages. With respect to previous analyses, our stars are on average 100 K hotter and 0.1 dex more metal rich, which shift the peak of the metallicity distribution function around the solar value. From Str枚mgren photometry we are able to derive for the first time a proxy for [伪/Fe] abundances, which enables us to perform a tentative dissection of the chemical thin and thick disc. We find evidence for the latter being composed of an old, mildly but systematically alpha-enhanced population that extends to super solar metallicities, in agreement with spectroscopic studies. Our revision offers the largest existing kinematically unbiased sample of the solar neighbourhood that contains full information on kinematics, metallicities, and ages and thus provides better constraints on the physical processes relevant in the build-up of the Milky Way disc, enabling a better understanding of the Sun in a Galactic context. <P />Catalogue (Table 2) is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138</A>"> <meta property="og:url" content="https://ui.adsabs.harvard.edu/abs/2011A&A...530A.138C/abstract"> <meta property="og:image" content="https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg"> <meta property="article:published_time" content="06/2011"> <meta property="article:author" content="Casagrande, L."> <meta property="article:author" content="Sch枚nrich, R."> <meta property="article:author" content="Asplund, M."> <meta property="article:author" content="Cassisi, S."> <meta property="article:author" content="Ram铆rez, I."> <meta property="article:author" content="Mel茅ndez, J."> <meta property="article:author" content="Bensby, T."> <meta property="article:author" content="Feltzing, S.">  <meta name="citation_journal_title" content="Astronomy and Astrophysics"> <meta name="citation_authors" content="Casagrande, L.;Sch枚nrich, R.;Asplund, M.;Cassisi, S.;Ram铆rez, I.;Mel茅ndez, J.;Bensby, T.;Feltzing, S."> <meta name="citation_title" content="New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey"> <meta name="citation_date" content="06/2011"> <meta name="citation_volume" content="530"> <meta name="citation_firstpage" content="A138"> <meta name="citation_doi" content="10.1051/0004-6361/201016276"> <meta name="citation_issn" content="0004-6361"> <meta name="citation_language" content="en"> <meta name="citation_keywords" content="stars: abundances"> <meta name="citation_keywords" content="stars: fundamental parameters"> <meta name="citation_keywords" content="Hertzsprung-Russell and C-M diagrams"> <meta name="citation_keywords" content="stars: kinematics and dynamics"> <meta name="citation_keywords" content="Galaxy: disk"> <meta name="citation_keywords" content="solar neighborhood"> <meta name="citation_keywords" content="Astrophysics - Galaxy Astrophysics"> <meta name="citation_keywords" content="Astrophysics - Solar and Stellar Astrophysics"> <meta name="citation_abstract_html_url" content="https://ui.adsabs.harvard.edu/abs/2011A&A...530A.138C/abstract"> <meta name="citation_publication_date" content="06/2011"> <meta name="citation_pdf_url" content="https://ui.adsabs.harvard.edu/link_gateway/2011A&A...530A.138C/PUB_PDF"> <meta name="citation_arxiv_id" content="arXiv:1103.4651" /> <link title="schema(PRISM)" rel="schema.prism" href="http://prismstandard.org/namespaces/1.2/basic/" /> <meta name="prism.publicationDate" content="06/2011" /> <meta name="prism.publicationName" content="A&A" /> <meta name="prism.issn" content="0004-6361" /> <meta name="prism.volume" content="530" /> <meta name="prism.startingPage" content="A138" /> <link title="schema(DC)" rel="schema.dc" href="http://purl.org/dc/elements/1.1/" /> <meta name="dc.identifier" content="doi:10.1051/0004-6361/201016276" /> <meta name="dc.date" content="06/2011" /> <meta name="dc.source" content="A&A" /> <meta name="dc.title" content="New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey" /> <meta name="dc.creator" content="Casagrande, L."> <meta name="dc.creator" content="Sch枚nrich, R."> <meta name="dc.creator" content="Asplund, M."> <meta name="dc.creator" content="Cassisi, S."> <meta name="dc.creator" content="Ram铆rez, I."> <meta name="dc.creator" content="Mel茅ndez, J."> <meta name="dc.creator" content="Bensby, T."> <meta name="dc.creator" content="Feltzing, S.">  <meta name="twitter:card" content="summary_large_image"/> <meta name="twitter:description" content="We present a re-analysis of the Geneva-Copenhagen survey, which benefits from the infrared flux method to improve the accuracy of the derived stellar effective temperatures and uses the latter to build a consistent and improved metallicity scale. Metallicities are calibrated on high-resolution spectroscopy and checked against four open clusters and a moving group, showing excellent consistency. The new temperature and metallicity scales provide a better match to theoretical isochrones, which are used for a Bayesian analysis of stellar ages. With respect to previous analyses, our stars are on average 100 K hotter and 0.1 dex more metal rich, which shift the peak of the metallicity distribution function around the solar value. From Str枚mgren photometry we are able to derive for the first time a proxy for [伪/Fe] abundances, which enables us to perform a tentative dissection of the chemical thin and thick disc. We find evidence for the latter being composed of an old, mildly but systematically alpha-enhanced population that extends to super solar metallicities, in agreement with spectroscopic studies. Our revision offers the largest existing kinematically unbiased sample of the solar neighbourhood that contains full information on kinematics, metallicities, and ages and thus provides better constraints on the physical processes relevant in the build-up of the Milky Way disc, enabling a better understanding of the Sun in a Galactic context. <P />Catalogue (Table 2) is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138</A>"/> <meta name="twitter:title" content="New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). 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Improved astrophysical parameters for the Geneva-Copenhagen Survey <a href=""></a> </h2> <div id="authors-and-aff" class="s-authors-and-aff"> <ul class="list-inline"> <li class="author"><a href="/search/?q=author%3A%22Casagrande%2C+L.%22">Casagrande, L.</a> </li>; <li class="author"><a href="/search/?q=author%3A%22Sch%C3%B6nrich%2C+R.%22">Sch枚nrich, R.</a> </li>; <li class="author"><a href="/search/?q=author%3A%22Asplund%2C+M.%22">Asplund, M.</a> </li>; <li class="author"><a href="/search/?q=author%3A%22Cassisi%2C+S.%22">Cassisi, S.</a> </li>; <li class="author"><a href="/search/?q=author%3A%22Ram%C3%ADrez%2C+I.%22">Ram铆rez, I.</a> </li>; <li class="author"><a href="/search/?q=author%3A%22Mel%C3%A9ndez%2C+J.%22">Mel茅ndez, J.</a> </li>; <li class="author"><a href="/search/?q=author%3A%22Bensby%2C+T.%22">Bensby, T.</a> </li>; <li class="author"><a href="/search/?q=author%3A%22Feltzing%2C+S.%22">Feltzing, S.</a> </li> </ul> </div> <div class="s-abstract-text"> <h4 class="sr-only">Abstract</h4> <p> We present a re-analysis of the Geneva-Copenhagen survey, which benefits from the infrared flux method to improve the accuracy of the derived stellar effective temperatures and uses the latter to build a consistent and improved metallicity scale. Metallicities are calibrated on high-resolution spectroscopy and checked against four open clusters and a moving group, showing excellent consistency. The new temperature and metallicity scales provide a better match to theoretical isochrones, which are used for a Bayesian analysis of stellar ages. With respect to previous analyses, our stars are on average 100 K hotter and 0.1 dex more metal rich, which shift the peak of the metallicity distribution function around the solar value. From Str枚mgren photometry we are able to derive for the first time a proxy for [伪/Fe] abundances, which enables us to perform a tentative dissection of the chemical thin and thick disc. We find evidence for the latter being composed of an old, mildly but systematically alpha-enhanced population that extends to super solar metallicities, in agreement with spectroscopic studies. Our revision offers the largest existing kinematically unbiased sample of the solar neighbourhood that contains full information on kinematics, metallicities, and ages and thus provides better constraints on the physical processes relevant in the build-up of the Milky Way disc, enabling a better understanding of the Sun in a Galactic context. <P />Catalogue (Table 2) is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/530/A138</A> </p> </div> <br> <dl class="s-abstract-dl-horizontal"> <dt>Publication:</dt> <dd> <div id="article-publication">Astronomy and Astrophysics</div> </dd> <dt>Pub Date:</dt> <dd>June 2011</dd> <dt>DOI:</dt> <dd> <span> <a href="/link_gateway/2011A&A...530A.138C/doi:10.1051/0004-6361/201016276" target="_blank" rel="noopener">10.1051/0004-6361/201016276</a> <i class="fa fa-external-link"></i> </span> </dd> <dt>arXiv:</dt> <dd> <span> <a href="/link_gateway/2011A&A...530A.138C/arXiv:1103.4651" target="_blank" rel="noopener">arXiv:1103.4651</a> <i class="fa fa-external-link"></i> </span> </dd> <dt>Bibcode:</dt> <dd> <a href="/abs/2011A%26A...530A.138C/abstract"> 2011A&A...530A.138C </a> <i class="icon-help" title="The bibcode is assigned by the ADS as a unique identifier for the paper."></i> </dd> <dt>Keywords:</dt> <dd> <ul class="list-inline"> <li>stars: abundances;</li> <li>stars: fundamental parameters;</li> <li>Hertzsprung-Russell and C-M diagrams;</li> <li>stars: kinematics and dynamics;</li> <li>Galaxy: disk;</li> <li>solar neighborhood;</li> <li>Astrophysics - Galaxy Astrophysics;</li> <li>Astrophysics - Solar and Stellar Astrophysics</li> </ul> </dd> <dt>E-Print:</dt> <dd> Minor changes to match published version. 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New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey - NASA/ADS