منابع مشابه
Period, Color, and Luminosity for Cepheid Variables
Payne-Gaposehkin, Cecilia H. Period, Color, and Luminosity for Cepheid Variables. Smithsonian Contributions to Astrophysics, number 17, 10 pages, 8 tables, 1974.—The Cepheids of the Galaxy and the Magellanic Clouds display a gradation in properties, but when amplitude as well as period is taken into account, their intrinsic colors are sensibly similar. The periodluminosity relations in the thre...
متن کاملThe Intermediate-period Cepheid Strip Stars
To explore the population of variable stars that fall between RR Lyrae stars and classical Cepheids, we have obtained extensive photometric observations for 56 stars with periods between 0.6 and 1.0 days. For these stars and an additional 10, we have examined the form and stability of the light curves to explore the variety of types of stars in this period regime. We conclude that the majority ...
متن کاملOn the Normalizationof Cepheid Period-luminosity Relationships
Results of stellar evolution calculations and results of non-adiabatic stellar pulsation calculations can be used to construct theoretical , composition-dependent, short period boundaries (or \blue edges") of the instability strip in the period-luminosity plane for Cepheids pulsating in the fundamental and rst overtone radial modes. The slopes of these blue edges are very similar to the slopes ...
متن کاملLetter to the Editor A HgMn companion to the Cepheid SU Cyg
We report here the discovery of a chemically peculiar star of the HgMn type as a companion to the classical Cepheid variable SU Cyg. This is the first investigation of a HgMn star in a binary system in which a star of a more advanced evolutionary stage is the primary. The age of the Cepheid provides an estimate to the age of the chemical peculiarities which is independent of the photometric cal...
متن کاملConcerning the Slope of the Cepheid Period-Luminosity Relation
We discuss the impact of possible differences in the slope of the Cepheid Period-Luminosity relation on the determination of extragalactic distances in the context of recent studies that suggest changes in this slope. We show that the Wesenheit function W = V −R×((V −I), widely used for the determination of Cepheid distances, is expected to be highly insensitive to changes in the slope of the u...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2017
ISSN: 1538-3881
DOI: 10.3847/1538-3881/aa8ccc