Spectra of six main sequence stars with spectral types from F0 to G8 were obtained with the IUE long wavelength spectrograph at high resolution. Four or more...
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PublicaciónA search for MG 2 H and K emission core variability in six main sequence stars
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PublicaciónAn empirical approach to the location of the theoretical isochrones in the observational plane
A new empirical calibration of the (B-V) index versus the three fundamental stellar parameters T(eff), (Fe/H), and log g is presented whose range of validity is...
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PublicaciónAn empirical colour-T(eff) calibration for G and K dwarf and subdwarf stars
Infrared observations are used to obtain effective temperatures with a 3-percent error for a sample of low main-sequence stars. The empirical calibration of...
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PublicaciónAn optical time-resolved spectroscopic study of SS Cygni. 1: Quiescence
In this work we analyze time-resolved spectra of SS Cygni in quiescence. The geometrical and orbital fundamental parameters of the system are determined. When...
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PublicaciónBlue stragglers in open clusters - A test of the binary hypothesis
A search for binaries among 17 blue stragglers in five galactic clusters, NGC 7789, 6633, 6819, 6939, and M 67, has been performed using measurements of radial...
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PublicaciónCCD photometry of stars in the old open cluster NGC 188
CCD photometry for stars in three fields centered on the old open cluster NGC 188 is presented, with the aim of investigating the HR diagram distribution of...
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PublicaciónCCD UBVR photometry of the old rich open cluster King 2 - Comparison with theoretical models
In this paper we present the Johnson-Cousins UBVR CCD photometry of the stars in King 2, an old open cluster towards the galactic anticenter. We have obtained...
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PublicaciónHigh-velocity outflows in post-Main-Sequence nebulae
Observations of three post-Main-Sequence nebulae, taken with an intermediate dispersion spectrograph mounted on the 2.5 m Isaac Newton Telescope (La Palma...
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PublicaciónInfrared photometry of open clusters - The main sequence of NGC 752
New infrared photometry of a sample of 39 stars in the open cluster NGC 752 is presented. These observations confirm the bimodality of the main sequence...