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

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

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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

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

In a multi-site photometric campaign to monitor T Tauri stars (TTS) in the Taurus-Auriga cloud over more than two months - dubbed Coordinated Observations of Young ObjecTs from Earthbound Sites (COYOTES), we find all 24 of our target stars show evidence for periodic light variations with periods between 1.2 and 24.0 days. This more than doubles the