NEW VARIABLE STARS AROUND THE CEPHEID VARIABLE TU CAS
نویسندگان
چکیده
منابع مشابه
The Luminosity Scale of Cepheid Variable Stars: a Revision
The period-luminosity-color relation for classical Cepheids is discussed in terms of a recent redeterminations of the distance moduli of open clusters with Cepheid members. The distance moduli of eight clusters with well established Cepheid members were determined from Stromgren four-color and Hp photometry of the B stars. Possible sources of systematic errors in these distance moduli are discu...
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We introduce a simple method for determining pulsation velocities of Cepheid variables; namely, the matching of observed spectral line profiles in both shape and absolute position with model profiles. This approach avoids the ambiguous meaning of radial velocity for asymmetric lines, and it avoids the awkward projection factor (the “p” factor) used to expand radial velocities to pulsation veloc...
متن کاملLINEAR PULSATION CHARACTERISTICS OF MIRA VARIABLE STARS
The linear adiabatic pulsation-periods of Mira variable stars have been derived. Approximately 2701[1]models were calculated for M = 0.7 MΘ to 2 MΘ stars with radii from 180 RΘ to 340 RΘ and luminosities from 2800 LΘ to 10,000 LΘ. The chemical composition of all models is (X,Z) = (0.7,0.02). From the result of this study, linear relations on Luminosity-Period-Mass relationship and luminosity-pe...
متن کاملlinear pulsation characteristics of mira variable stars
the linear adiabatic pulsation-periods of mira variable stars have been derived. approximately 2701[1]models were calculated for m = 0.7 mθ to 2 mθ stars with radii from 180 rθ to 340 rθ and luminosities from 2800 lθ to 10,000 lθ. the chemical composition of all models is (x,z) = (0.7,0.02). from the result of this study, linear relations on luminosity-period-mass relationship and luminosity-pe...
متن کاملMining Sky Surveys for Astrophysically Interesting Variable Stars: The Cepheid Period Range
We have undertaken a project to discover new type I1 Cepheids in two large-area sky surveys. However, most of the candidates from the surveys differ from type I1 Cepheids in their amplitude and period distributions and they form a separate, cooler sequence relative to the Cepheids in a temperature-gravity plot. We refer to these objects as "Cepheid-lke" stars. Many e h b i t unstable pulsation ...
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ژورنال
عنوان ژورنال: Publications of The Korean Astronomical Society
سال: 2005
ISSN: 1225-1534
DOI: 10.5303/pkas.2005.20.1.029