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http://hdl.handle.net/20.500.12386/27947
Titolo: | The GOTHAM survey: chemical evolution of Milky Way globular clusters | Autori: | Dias, Bruno Barbuy, Beatriz Saviane, Ivo HELD, Enrico Valerio da Costa, Gary Ortolani, Sergio GULLIEUSZIK, MARCO |
Data pubblicazione: | 2018 | Titolo del volume in cui è pubblicato il poster: | Rediscovering Our Galaxy | Curatore/i del volume in cui è pubblicato il contributo: | Chiappini, C.; Minchev, I.; Starkenburg, E.; Valentini, M. | Serie: | PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION | Numero: | vol. 13, S334 | Da pagina:: | 25 | Abstract: | Milky Way globular clusters are excellent laboratories for stellar population detailed analysis that can be applied to extragalactic environments with the advent of the 40m-class telescopes like the ELT. The globular cluster population traces the early evolution of the Milky Way which is the field of Galactic archaeology. We present our GlObular clusTer Homogeneous Abundance Measurement (GOTHAM) survey. We derived radial velocities, Teff, log(g), [Fe/H], [Mg/Fe] for red giant stars in one third of all Galactic globular clusters that represent well the Milky Way globular cluster system in terms of metallicity, mass, reddening, and distance. Our method is based on low-resolution spectroscopy and is intrinsically reddening free and efficient even for faint stars. Our [Fe/H] determinations agree with high-resolution results to within 0.08 dex. The GOTHAM survey provides a new metallicity scale for Galactic globular clusters with a significant update of metallicities higher than [Fe/H] > -0.7. We show that the trend of [Mg/Fe] with metallicity is not constant as previously found, because now we have more metal-rich clusters. Moreover, peculiar clusters whose [Mg/Fe] does not match Galactic stars for a given metallicity are discussed. We also measured the CaII triplet index for all stars and we show that the different chemical evolution of Milky Way open clusters, field stars, and globular clusters implies different calibrations of calcium triplet to metallicity. | Titolo del convegno: | Rediscovering our Galaxy | Luogo del convegno: | Potsdam, Germany | Periodo del convegno: | 10-14 July, 2017 | URI: | http://hdl.handle.net/20.500.12386/27947 | URL: | https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/gotham-survey-chemical-evolution-of-milky-way-globular-clusters/B84D7FAC7469EF30230F6A3F980079CB# | ISSN: | 1743-9213 | ISBN: | 978-1-107-19234-8 | DOI: | 10.1017/S1743921317007086 | Bibcode ADS: | 2018IAUS..334...25D | Fulltext: | open |
È visualizzato nelle collezioni: | 3.01 Contributi in Atti di convegno |
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