منابع مشابه
Double-mode Rr Lyrae Variables: Pulsational Masses Revisited
Double-mode RR Lyrae variables (i.e. radial variables which are simultaneously pulsating in both fundamental and first overtone modes) appear a fundamental tool for investigating the mass of old Population II Horizontal Branch (HB) stars. The most widespread method adopted for evaluating the masses of these objects is based on the Petersen (1973) approach, which relies only on pulsational perio...
متن کاملGlobular Cluster Distances and Physical Properties from Double- and Fundamental Mode Variables
We briefly describe a method of obtaining relative intrinsic stellar parameters, such as absolute magnitudes and colors from the light curves of fundamental mode RR Lyrae (RRab) stars. Absolute stellar parameters of double-mode variables (Cepheids and RR Lyrae stars) can be computed from their periods and intrinsic colors combined with stellar atmosphere and pulsation models. By using these two...
متن کاملA&a Manuscript No. Pulsation Models of Scuti Variables I. the High{amplitude Double{mode Stars
The relations between high{amplitude Scuti stars and the much more abundant low{amplitude Sct variables are not clear. Both groups have similar periods and seem to have almost the same basic physical properties , although their light{curve characteristics are very diierent. In the last few years much improved observational data have been published, and improved theoretical physics | in particul...
متن کاملOn the double-mode RR Lyrae variables of the Sculptor dwarf galaxy
Frequency analysis of more than 300 stars of the ogle data base on Sculptor galaxy has led to the discovery of 18 double-mode RR Lyrae (RRd) variables. This yields a 20% incidence rate for double-mode pulsation among the variables previously classified as first overtone RR Lyrae stars in this galaxy. Most of the RRd stars cover the period range of 0. 47 < P0 < 0. 49 but there are two stars with...
متن کاملImplementation of Control Variables to Exploit Output Power for SRGs in Single Pulse Mode Operation
This paper presents an analytical modeling method of optimal control variables to maximize output power for switched reluctance generators (SRGs) in single pulse mode operation. This method extends the basic theory of the Stiebler model and utilizes the flux linkage function to express the inductance model of SRG. In this paper, the optimal phase current shape of SRG for maximum output power is...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2000
ISSN: 0252-9211
DOI: 10.1017/s0252921100057742