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Photometry Of Type Ii Cepheid Candidates From The Northern Part Of The All Sky Automated Survey, Edward G. Schmidt, Brian Hemen, Danielle Rogalla, Lauren Thacker-Lynn, University Of Nebraska - Lincoln
Photometry Of Type Ii Cepheid Candidates From The Northern Part Of The All Sky Automated Survey, Edward G. Schmidt, Brian Hemen, Danielle Rogalla, Lauren Thacker-Lynn, University Of Nebraska - Lincoln
Edward Schmidt Publications
We have obtained VR photometry of 282 Cepheid variable star candidates from the northern part of the All Sky Automated Survey (ASAS). These together with data from the ASAS and the Northern Sky Variability Survey (NSVS) were used to redetermine the periods of the stars. We divided the stars into four groups based on location in a plot of mean color, (V − R), versus period. Two of the groups fell within the region of the diagram containing known type II Cepheids and yielded 14 new highly probable type II Cepheids. The properties of the remaining stars in these two …
Mining Sky Surveys For Astrophysically Interesting Variable Stars: The Cepheid Period Range, Edward G. Schmidt
Mining Sky Surveys For Astrophysically Interesting Variable Stars: The Cepheid Period Range, Edward G. Schmidt
Edward Schmidt Publications
We have undertaken a project to discover new type II Cepheids in two large-area sky surveys. However, most of the candidates from the surveys differ from type II 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 exhibit unstable pulsation which we illustrate with representative light curves.