We report the first detection of polarization signals induced by the Zeeman Effect in lines of the E4Π-A4Π system of FeH located at 1.6 μm. Motivated by the tentative detection of this band in the intensity spectrum of late-type dwarfs, we have investigated in detail the full Stokes sunspot spectrum in the near-infrared around 1.6 μm, finding

Detection of objects with masses close to that of Jupiter in various astrophysical contexts will be feasible with GTC first light instruments. The mid-infrared camera, CANARICAM, will contribute to the detection and characterization of these objects orbiting around F-M stars and brown dwarfs. It will allow us to explore a domain of orbital radii

Not Available

We present Cu and Zn abundances for a sample of 30 stars spanning a metallicity range between solar and [Fe/H]=-3. LTE abundances were obtained using Kurucz model atmospheres and the near UV lines of Cu I 3273.95 and Zn I 3302.58 A observed at high spectral resolution. The trend of [Zn/Fe] vs [Fe/H] is essentially constant over the whole

We present Cu and Zn abundances for a sample of 30 stars spanning a metallicity range between solar and [Fe/H]=-3. LTE abundances were obtained using Kurucz model atmospheres and the near UV lines of Cu I 3273.95 and Zn I 3302.58 A observed at high spectral resolution. The trend of [Zn/Fe] vs [Fe/H] is essentially constant over the whole

We report our analysis of the stability of pulsation periods in the DAV star (pulsating hydrogen atmosphere white dwarf) ZZ Ceti, also called R 548. Based on observations that span 31 years, we conclude that the period 213.132605 s observed in ZZ Ceti drifts at a rate dP/dt=1.2 Gyr, comparable to the theoretical cooling timescale for the star. Our