Department of Physics and Astronomy: Publications and Other Research
Date of this Version
6-2009
Abstract
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 groups are discussed but their nature remains uncertain. Unexplained differences exist between the sample of stars studied here and a previous sample drawn from the NSVS by Akerlof et al. This suggests serious biases in the identification of variables in different surveys.
3 machine-readable text tables are attached as supplemental files.
Table 1 (machine-readable text)
aj302515t2_mrt.txt (181 kB)
Table 2 (machine-readable text)
aj302515t3_mrt.txt (23 kB)
Table 3 (machine-readable text)
Comments
Published in The Astronomical Journal, 137:4598–4607, 2009 June doi:10.1088/0004-6256/137/6/4598. Copyright (c) 2009 The American Astronomical Society. Used by permission.