A METHOD OF COLOR EXCESS DETERMINATION FOR HIGH AMPLITUDE δ SCUTI STARS
نویسندگان
چکیده
منابع مشابه
Incidence of high-amplitude δ Scuti type variable stars
An order-of-magnitude estimate for the incidence of high-amplitude δ Scuti-type variable stars (HADS) in the δ Scuti area of the H-R diagram is calculated. Using a model for the stellar distribution in the Milky Way, we calculate the number of stars that are expected to fall in the δ Scuti area of the H-R diagram within the magnitude range and sky coverage of the ROTSE Survey for Variables I (R...
متن کاملHipparcos parallaxes and period-luminosity relations of high-amplitude δ Scuti stars
Hipparcos parallaxes of high–amplitude δ Scuti stars are used to derive a period–luminosity relation with a scatter of about ±0.1 mag, which is independent from photometric calibrations to absolute luminosities. Comparisonswith several P–L relations from the literature show satisfactory agreement, and all deviations from theHipparcosmean relation canbe explainedby uncertainties in the data avai...
متن کاملA photometric monitoring of bright high - amplitude δ Scuti stars I . The double - mode pulsation of V 567 Ophiuchi
We present the first results of an observational project, which addresses the period changing behaviour of a sample of high-amplitude δ Scuti stars. In this paper we discuss the double-mode nature of V567 Ophiuchi. It was observed on 15 nights in two consecutive years in order to resolve the long-standing ambiguity related to its secondary period. A frequency analysis of almost 5000 individual ...
متن کاملThe search for δ Scuti stars in open clusters
In order to improve the tests of models of stellar evolution, observations giving tighter constraints on the models were initiated by the formation of an informal group STACC (Frandsen, 1992). The purpose of the group is to search for and make observations of δ Scuti stars in open clusters. This paper presents some of the results of the search, mainly for distant open clusters with a rich popul...
متن کاملAmplitude investigation of δ Scuti variables in open clusters
We report here the results of a statistical analysis of 28 δ Scuti stars from five open clusters, α Persei, Pleiades, Hyades, Praesepe and Coma. These δ Scuti variables, most of which are on the main sequence, tend to show a positive correlation between oscillation amplitude and absolute luminosity. No correlation is found between amplitude and effective temperature .
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: Journal of The Korean Astronomical Society
سال: 2009
ISSN: 1225-4614
DOI: 10.5303/jkas.2009.42.6.155