Navegação Ciências Exatas e da Terra por Autor "Rich, Robert Michael"

Resultados 1-9 de 9

    • Age and metallicity distribution of the galactic bulge from extensive optical and near-IR stellar photometry 

      Zoccali, Manuela; Renzini, Alvio; Ortolani, Sergio; Greggio, Laura; Saviane, Ivo; Cassisi, Santi; Rejkuba, Marina; Barbuy, Beatriz; Rich, Robert Michael; Bica, Eduardo Luiz Damiani (2003) [Artigo de periódico]
      We present a new determination of the metallicity distribution, age, and luminosity function of the Galactic bulge stellar population. By combining near-IR data from the 2MASS survey, from the SOFI imager at ESO NTT and ...

    • HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4 

      Ortolani, Sergio; Barbuy, Beatriz; Bica, Eduardo Luiz Damiani; Renzini, Alvio; Zoccali, Manuela; Rich, Robert Michael; Cassisi, Santi (2001) [Artigo de periódico]
      We present results from NICMOS Hubble Space Telescope observations of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4, obtained through the filters F110W (1.1 μm) and F160W (1.6 μm) ...

    • The metal content of the bulge globular cluster NGC 6528 

      Zoccali, Manuela; Barbuy, Beatriz; Hill, Vanessa; Ortolani, Sergio; Renzini, Alvio; Bica, Eduardo Luiz Damiani; Momany, Yazan; Pasquini, Luca; Minniti, Dante; Rich, Robert Michael (2004) [Artigo de periódico]
      High resolution spectra of five stars in the bulge globular cluster NGC 6528 were obtained at the 8m VLT UT2-Kueyen telescope with the UVES spectrograph. Out of the five stars, two of them showed evidence of binarity. The ...

    • VI photometry of the post-core-collapse globular cluster NGC 6558 and the adjacent bulge field population 

      Rich, Robert Michael; Ortolani, Sergio; Bica, Eduardo Luiz Damiani; Barbuy, Beatriz (1998) [Artigo de periódico]
      We present V I color-magnitude diagrams (CMDs) of the globular cluster NGC 6558 and its surrounding field, obtaining cluster parameters. The cluster has a blue extended horizontal branch and a depleted red giant branch, ...

    • V, J, H and K imaging of the metal rich globular cluster NGC 6528 : reddening, metallicity, and distance based on cleaned colour-magnitude diagrams 

      Momany, Yazan; Ortolani, Sergio; Held, Enrico V.; Barbuy, Beatriz; Bica, Eduardo Luiz Damiani; Renzini, Alvio; Bedin, Luigi R.; Rich, Robert Michael; Marconi, Gianni (2003) [Artigo de periódico]
      New near-infrared observations of NGC6528 are presented. The JHKs observations complement a previous HST/NICMOS data set by Ortolani et al. (2001), in that they sample a larger area, contain a more numerous sample of red ...

    • VLT-UVES abundance analysis of four giants in NGC 6553 

      Alves-Brito, Alan; Barbuy, Beatriz; Zoccali, Manuela; Minniti, Dante; Ortolani, Sergio; Hill, Vanessa; Renzini, Alvio; Pasquini, Luca; Bica, Eduardo Luiz Damiani; Rich, Robert Michael; Meléndez, Jorge; Momany, Yazan (2006) [Artigo de periódico]
      Context. Metal-rich globular clusters trace the formation of bulges. Abundance ratios in the metal-rich globular clusters such as NGC 6553 can constrain the formation timescale of the Galactic bulge. Aims. The purpose of ...

    • VLT-UVES analysis of 5 giants in 47 Tucanae 

      Alves-Brito, Alan; Barbuy, Beatriz; Ortolani, Sergio; Momany, Yazan; Hill, Vanessa; Zoccali, Manuela; Renzini, Alvio; Minniti, Dante; Pasquini, Luca; Bica, Eduardo Luiz Damiani; Rich, Robert Michael (2005) [Artigo de periódico]
      High resolution spectra of 5 giants, including a horizontal branch star, of the metal-rich globular cluster 47 Tucanae were obtained with the UVES spectrograph at the 8m VLT UT2-Kueyen telescope. The atmospheric parameters ...

    • VLT-UVES analysis of two giants in the bulge metal-poor globular cluster HP-1 

      Barbuy, Beatriz; Zoccali, Manuela; Ortolani, Sergio; Momany, Yazan; Hill, Vanessa; Yadav, Ramakant Singh; Renzini, Alvio; Minniti, Dante; Pasquini, Luca; Bica, Eduardo Luiz Damiani; Rich, Robert Michael (2006) [Artigo de periódico]
      Context. Metal-poor globular clusters in the bulge are important tracers of early chemical evolution. HP-1 is among the six metal-poor clusters within 5. of the Galactic center, and could be the one closest to the center ...

    • VLT-UVES spectroscopy of a bulge giant magnified through microlensing : EROS-BLG-2000-5 

      Minniti, Dante; Barbuy, Beatriz; Hill, Vanessa; Bica, Eduardo Luiz Damiani; Ortolani, Sergio; Rich, Robert Michael; Cook, Kern H.; Vandehei, Thor; Renzini, Alvio; Pasquini, Luca; Bennett, David P. (2002) [Artigo de periódico]
      High resolution spectra of a magnified bulge star were obtained at the 8 m Kueyen VLT-UT2 telescope with the UVES spectrograph. The source is a bulge giant of baseline magnitude VEROS = 18.4, magnified to V ≈ 18.0. These ...