Publicaciones

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  • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. IV - Intensity variations of the optical emission lines of NGC 5548
    Measurements of optical emission-line flux variations based on spectra of the Seyfert galaxy NGC 5548 obtained between December 1988 and October 1989 are reported. All of the measured optical emission lines, H-alpha, H-beta, H-gamma, He I 5876, and He II 4686, exhibit the same qualitative behavior as the UV and optical continua, but with short time
    Wills, D. et al.

    Fecha de publicación:

    5
    1993
    Número de citas
    96
  • Spatially Resolved Spectroscopy of Wolf-Rayet Ring Nebulae - Part Four - the Fundamental Parameters of the Central Stars
    We derive effective temperatures, luminosities and related parameters for a sample of eight Wolf-Rayet stars - seven WN stars and a WO star - by computing elaborate photoionization models of their surrounding ring nebulae. The most recent non-LTE WR model atmospheres are used for the input stellar ionizing flux distributions. The photoionization
    Esteban, C. et al.

    Fecha de publicación:

    5
    1993
    Número de citas
    80
  • PRIMEROS RESULTADOS DE LA RED HELIOSISMOLOGICA I.R.I.S. (INTERNATIONAL RESEARCH OF THE INTERIOR OF THE SUN)
    ACTUALMENTE, LA INFORMACION HELIOSISMOLOGICA QUE PUEDE OBTENERSE A PARTIR DE ESTACIONES UNICAS SOBRE LA SUPERFICIE TERRESTRE SE ENCUENTRA ANALIZADA HASTA EL LIMITE. LA COMUNIDAD CIENTIFICA ESTA CONVENCIDA DE QUE, PARA PROSEGUIR EL AVANCE EN ESTE CAMPO, ES NECESARIO DISPONER DE SERIES TEMPRALES LARGAS E ININTERRUMPIDAS DE OBSERVACIONES DE LAS
    LUIS ENRIQUE SANCHEZ DUARTE

    Fecha de publicación:

    5
    1993
  • Multiband analysis of Sb abd Sc surface brightness (Prieto+ 1992)
    Not Available (1 data file).
    Prieto, M. et al.

    Fecha de publicación:

    5
    1993
    Número de citas
    0
  • Lithium Abundances in a Flux-Limited Sample of Galactic Carbon Stars
    Lithium abundances, or upper limits, have been derived for 161 galactic carbon stars, selected from the Two Micron Sky Survey, using high resolution, high signal to noise ratio spectra and synthetic spectrum fitting. Fourteen of these C-stars present surface lithium abundances [log ɛ(Li) ≥ 1.0] higher than theoretically expected during the AGB
    Abia, C. et al.

    Fecha de publicación:

    5
    1993
    Número de citas
    54
  • Globular Cluster Red Giants as a Probe of Horizontal Branch Luminosities
    Connecting observational data to recent theoretical prescriptions for the luminosity of RR Lyrae, we present a new estimate of the bolometric magnitude of the first brightest red giant for a selected sample of galactic globular clusters. Comparison with theoretical prescriptions for the red giant luminosity at the He-flash discloses an excellent
    Castellani, V. et al.

    Fecha de publicación:

    5
    1993
    Número de citas
    13