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6 papers · 1 filter
Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
A. H. Corsico, E. Garcia-Berro, L. G. Althaus +1
We explore the adiabatic pulsational properties of massive white dwarf stars with hydrogen-rich envelopes and oxygen/neon and carbon/oxygen cores. To this end, we compute the cooli…
The rate of period change in pulsating DB white dwarf stars
A. H. Corsico, L. G. Althaus
In this work, we present the theoretically expected rates of pulsation period change for V777 Her (DBV) variable stars. To this end we employ new evolutionary models representative…
New evolutionary models for massive ZZ Ceti stars. II. The effects of crystallization on their pulsational properties
A. H. Corsico, L. G. Althaus, M. H. Montgomery +2
We present in this work new pulsational calculations for improved carbon-oxygen DA white dwarf models suitable for the study of massive ZZ Ceti stars. The background models employe…
Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
Sandro Villanova, Gustavo Baume, Giovanni Carraro +1
We present and discuss broad band CCD photometry and low resolution spectroscopy for stars in the region of the open cluster NGC 6996, located in the North America Nebul…
NGC 2580 and NGC 2588: Two open clusters in the Third Galactic Quadrant
G. Baume, A. Moitinho, E. Giorgi +2
We present CCD broad band photometric observations in the fields of the Third Galactic Quadrant open clusters NGC 2580 and NGC 2588 ( and respectively). From th…
The double-layered chemical structure in DB white dwarfs
L. G. Althaus, A. H. Corsico
We study the structure and evolution of white dwarf stars with helium-rich atmospheres (DB) in a self-consistent way with the predictions of time-dependent element diffusion. Our t…