We present the first results of a combined HST/IUE/ground-based spectroscopic monitoring campaign on the Seyfert 1 galaxy NGC 5548 that was undertaken in order to address questions that require both higher temporal resolution and higher signal-to-noise ratios than were obtained in our previous multiwavelength monitoring of this galaxy in 1988 -- 89
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An Intensive HST, IUE, and Ground-Based Study of NGC 5548Korista, K. T. et al.121994
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An observational approach to convection in main sequence stars
Observational results concerning possible changes in the granulation of Main Sequence stars were found by analysing their seismic power spectra obtained from photometric microvariability. We analysed as many as 178 stars with spectral types F, G, K, and M observed for 54 days. We present evidence of changes in the lifetime and contrast of the
Régulo, C. et al.Fecha de publicación:
122005 -
An Optimized H_β Index for Disentangling Stellar Clusters and Galaxy Ages
We have derived a new H_{β} absorption index definition, which is fully optimized as an age indicator for old and intermediate-aged stellar populations. Rather than using stellar spectra, we employed theoretical SEDs at moderately high resolution for simple stellar populations of different ages and metallicities. The new index, which is virtually
Cervantes-Rodriguez, J. L. et al.Fecha de publicación:
122007 -
An Umbral Brightening Associated with a Two-Ribbon Flare
We report an unusual case of a two-ribbon flare associated with an umbral brightening in a magnetically unipolar region.
Vazquez, M. et al.Fecha de publicación:
121979 -
Analyse multi-echelle des champs magnetiques dans des nuages moleculaires a structures filamentaires
Together with other observational methods, visible and near infra-red polarimetry can help to understand the morphology of magnetic fields in the neighborhood of several star-forming regions. Inside molecular clouds, this morphology can be deduced with the help of submm polarimetry but rarely in the same regions. When both observational methods are
Poidevin, FrederickFecha de publicación:
122006 -
Analysis of Stellar Spectra from the Century Survey
We describe new methods of analysis that have been developed in order to make optimal use of the stellar spectral data obtained during the course of follow-up medium-resolution observations of color-selected stars from the ``Century Survey.'' The initial selection of stars in the stellar component of the Century Survey is based on broadband V and R
Beers, T. C. et al.Fecha de publicación:
122002