Evolutionary and Hydrodynamic Models of Short-Period Cepheids

Period-Luminosity relation for short period Cepheids towards the SMC

We present the Period{Luminosity relation from 290 Cepheids toward the LMC and 597 Cepheids towards the SMC respectively obtained from the monitoring of 1.134.000 and 504.000 stars over 150 nights using the two 4k 8k CCD camera of the Eros2 microlensing project. A slope break of the Period{Luminosity relation has been observed for SMC fundamental mode Cepheids with periods smaller than 2 days. ...

Hydrodynamic models for the short-period, classicalCepheid, SU Cas

On the pulsation mode identification of short-period Galactic Cepheids

We present new theoretical Period-Radius (PR) relations for first overtone Galactic Cepheids. Current predictions are based on several sequences of nonlinear, convective pulsation models at solar chemical composition (Y=0.28, Z=0.02) and stellar masses ranging from 3.0 to 5.5 M . The comparison between predicted and empirical radii of four short-period Galactic Cepheids suggests that QZ Nor and...

Theoretical Models for Classical Cepheids : II . Period - Luminosity , Period - Color and Period - Luminosity - Color Relations

We present and discuss theoretical predictions concerning the pulsational properties of Classical Cepheids. Masses and luminosities provided by stellar evolutionary calculations are used as input parameters of nonlinear, nonlocal and time–dependent convective pulsating models and accurate determinations of both the blue and red edge of the instability strip are derived, together with theoretica...

New period - luminosity and period - color relations of classical Cepheids III . Cepheids in SMC

The photometric data for 460 classical, fundamental-mode Cepheids in the SMC with log P > 0.4 measured by Udalski et al. have been analyzed for their period-color (P-C) and period-luminosity (P-L) relations, and for the variation of amplitude across the instability strip in a similar way that was done in Papers I and II of this series. The SMC Cepheids are bluer in (B−V) 0 at a given period tha...