10 papers · 1 filter
Matching the frequency spectrum of PMS stars by means of standard and rotating models
M. Di Criscienzo, P. Ventura, F. D' Antona +3
We applied the ATON code to the computation of detailed grids of standard (non--rotating) and rotating Pre--Main Sequence (PMS) models and computed their adiabatic oscillation spec…
NGC 2419: an "intergalactic wanderer" or a simple Galactic Globular Cluster?
M. Di Criscienzo, C. Greco, M. Dall'Ora +8
We have carried out a new photometric study of the remote Galactic globular cluster NGC 2419, using proprietary and archive B,V,I time-series CCD photometry of the cluster, that al…
Pulsational models of BL Her stars
M. Di Criscienzo, M. Marconi, F. Caputo +1
We present an updated and homogeneous pulsational scenario for a wide range of stellar parameters typical of BL Her stars i.e., Population II Cepheids with periods shorter than 8 d…
RR Lyrae stars in Galactic globular clusters. VI. The Period-Amplitude relation
G. Bono, F. Caputo, M. Di Criscienzo
We compare theory and observations for fundamental RR Lyrae in the solar neighborhood and in both Oosterhoff type I (OoI) and type II (OoII) Galactic globular clusters (GGCs). The…
Synthetic properties of bright metal-poor variables. II. BL Her stars
M. Di Criscienzo, F. Caputo, M. Marconi +1
We investigate the properties of the so-called BL Her stars, i.e., Population II Cepheids with periods shorter than 8 days, using updated pulsation models and evolutionary tracks c…
Updated pulsation models for BL Herculis stars
M. Marconi, M. Di Criscienzo
Population II pulsatingvariables play a relevant role both as distance indicators and as tracers of the properties of old stellar populations. In this paper we present an update an…