Long-Period Cepheids: Models and Observations
نویسندگان
چکیده
منابع مشابه
Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids
We compared period changes derived from O − C diagrams for 63 classical Cepheids from our Galaxy with model calculations. We found that for Cepheids with log P > 1.0 the observed changes are smaller than predicted values, except variable SZ Cas. However some of the first overtone Cepheids, particularly EU Tau and Polaris, change its period much faster than it follows from theory. Summary of the...
متن کامل2 Long Baseline Interferometric Observations of Cepheids
We present observations of the galactic cepheids η Aql and ζ Gem. Our observations are able to resolve the diameter changes associated with pulsation. This allows us to determine the distance to the Cepheids independent of photometric observations. We determine a distance to η Aql of 320 ± 32 pc, and a distance to ζ Gem of 362±38 pc. These observations allow us to calibrate surface brightness r...
متن کاملLong Baseline Interferometric Observations of Cepheids
We present observations of the galactic cepheids η Aql and ζ Gem. Our observations are able to resolve the diameter changes associated with pulsation. This allows us to determine the distance to the Cepheids independent of photometric observations. We determine a distance to η Aql of 320 ± 32 pc, and a distance to ζ Gem of 362±38 pc. These observations allow us to calibrate surface brightness r...
متن کاملTheoretical 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...
متن کاملNonlinear model pulsations for long-period Cepheids II. Magellanic Cloud Cepheids
Nonlinear, radiative models for long–period Cepheids in the Magellanic Clouds were constructed and the theoretical light and velocity curves were compared with observations. We assumed a metal content Z = 0.005, and two mass–luminosity M–L relations: one was obtained from stellar evolution calculation with convective overshooting models, and the other, which gives an even larger L for the same ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1995
ISSN: 0004-637X,1538-4357
DOI: 10.1086/176256