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  1. No Access

    Chapter and Conference Paper

    Spectrophotometry and Multicolour Imagery of the Planetary Nebula around the P Cygni Star AG Carinae

    Some of the high luminosity stars in our Galaxy are surrounded by planetary-like nebulae formed by material ejected from the central star. The most interesting case is that of the ring nebula PK 289–0°1 around...

    C. Rossi, A. Altamore, R. D. D. Costa, A. Damineli Neto… in Planetary Nebulae (1993)

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    Chapter and Conference Paper

    Mass Loss from Central Stars of Planetary Nebulae with WC Spectrum

    We derived mass loss rates for 5 central stars (CS) having WC spectrum: NGC 5315, BD+30 3639, He2-99, He2-113, SwSt-1. The values are substantially higher than other previous estimates based on UV data. We con...

    J. A. Freitas De Pacheco, R. D. D. Costa in The Stellar Populations of Galaxies (1992)

  3. No Access

    Chapter and Conference Paper

    Synthetic M/L B Ratios for E and S Galaxies

    We report new calculations of M/L B ratios for galaxies, which are considered to be closed homogeneous systems. A Salpeter’s law was assumed for the initial mass function. The s...

    A. C. Borges, J. A. Freitas de Pacheco in The Stellar Populations of Galaxies (1992)