J/PASP/126/509  RR Lyrae stars double-mode radial pulsations    (Poleski+, 2014)
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Beginning of ReadMe : J/PASP/126/509 Double-mode RR Lyrae stars in LINEAR (Poleski+, 2014) ================================================================================ Double-mode radial pulsations among RR Lyrae stars. Poleski R. <Publ. Astron. Soc. Pac., 126, 509-520 (2014)> =2014PASP..126..509P ================================================================================ ADC_Keywords: Stars, variable Keywords: Stars Abstract: Double-mode RR Lyr type stars are important for studies of properties of horizontal-branch stars. In particular, two periods coupled with spectral properties give a mass estimate that is independent of evolutionary models. Here, we present 59 new Galactic double-mode RR Lyr stars found in the LINEAR survey data with the fundamental radial mode and the first overtone exited (RRd stars). These stars may be useful for constraining the mass-metallicity relation for field horizontal-branch stars. Also, new RRd stars found in the LMC by EROS-II are verified. We present the updated Petersen diagram and the distribution of the fundamental mode periods. Comments on selected variable stars from LINEAR and LMC EROS-II surveys are also presented, including very rare objects: the third known mode-switching RR Lyr and a Cepheid pulsating simultaneously in three radial modes. Description: The LINEAR survey operated between 1998 and 2009 using two 1m telescopes. Each of the mosaic cameras had a 2deg^2^ field of view with a 2.25" pixel scale. Observations were collected without a filter and sometimes in nonphotometric conditions. On average, 250 epochs were collected per field, and the number rises to 500 for targets close to the ecliptic plane. Such a dataset is suitable for a search for periodic variable stars. The catalog of such objects was presented by Palaversa et al. (2013AJ....146..101P, Cat. J/AJ/146/101). It includes more than 7000 stars, most of which are RR Lyr pulsators. There are 2923 RRab and 990 RRc stars. We performed the search for other radial modes in RR Lyr type stars.

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