Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.5304s&link_type=abstract
American Astronomical Society, AAS Meeting #212, #53.04; Bulletin of the American Astronomical Society, Vol. 40, p.250
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained low resolution spectra of variable stars from the NSVS which were identified by Schmidt et al. (2007, AJ 133, 665) as possible type II Cepheids. A number of known Cepheids were also observed for comparison. About 20% of the spectra exhibit strong hydrogen line emission; those stars are probably interacting binaries and accordingly were removed from the sample. Lick indices were used to determine the effective temperatures, gravities, and metallicities of the remaining stars. In a plot of gravity against temperature most of the stars occupy two well separated sequences. A cool sequence consists entirely of low amplitude stars while the known Cepheids and all of the large amplitude Cepheid candidates are located in the hotter sequence. We speculate that the two sequences arise from different pulsation modes. The large amplitude stars are presumably fundamental mode radial pulsators. Pulsational calculations are needed to identify the mode of the small amplitude sequence.
Rogalla Danielle
Schmidt Edward G.
Thacker-Lynn Lauren
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