Binarity and multiperiodicity in 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 کاملPhotometry and asteroseismology of δ Scuti stars in Praesepe
We discuss observations and seismic analyses for three multi-periodic δ Scuti stars in the Praesepe cluster: BU, BN and BV Cnc. For two stars (BU and BN Cnc) we re-analyse published photoelectric photometry and show that using statistical weights results in a dramatic reduction in the noise level. We detect seven frequencies in BU Cnc and eight in BN Cnc, with three of the latter being previous...
متن کاملPhotometric Modal Discrimination in Δ Scuti and Γ Doradus Stars
Abstract. The potential of photometric methods for the identification of l, the degree of spherical surface harmonic of a pulsating star, is investigated with special emphasis on Strömgren photometry applied to δ Scuti and γ Dor variables. Limitations of actual model atmospheres when fine precision is required for the calculations of partial derivatives and integrals, which depend on limb darke...
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 .
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2009
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2008.14381.x