Spectra of Type II Cepheid Candidates and Related Stars

We present low-resolution spectra for variable stars in the Cepheid period range from the ROTSE-I Demonstration Project and the All Sky Automated Survey, some of which were previously identified as type II Cepheid candidates. We have derived effective temperatures, gravities, and metallicities from...

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Veröffentlicht in:	The Astronomical journal 2011-02, Vol.141 (2), p.53-jQuery1323898276551='48'
Hauptverfasser:	Schmidt, E. G, Rogalla, Danielle, Thacker-Lynn, Lauren
Format:	Artikel
Sprache:	eng
Schlagworte:	AMPLITUDES ASTROPHYSICS, COSMOLOGY AND ASTRONOMY CEPHEIDS GRAVITATION MAIN SEQUENCE STARS PULSATING VARIABLE STARS SPECTRA STARS STELLAR ACTIVITY VARIABLE STARS
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container_title	The Astronomical journal
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creator	Schmidt, E. G Rogalla, Danielle Thacker-Lynn, Lauren
description	We present low-resolution spectra for variable stars in the Cepheid period range from the ROTSE-I Demonstration Project and the All Sky Automated Survey, some of which were previously identified as type II Cepheid candidates. We have derived effective temperatures, gravities, and metallicities from the spectra. Based on this, three types of variables were identified: Cepheid strip stars, cool stars that lie along the red subgiant and giant branch, and cool main-sequence stars. Many fewer type II Cepheids were found than expected and most have amplitudes less than 0.4 mag. The cool variables include many likely binaries as well as intrinsic variables. Variation among the main-sequence stars is likely to be mostly due to binarity or stellar activity.
doi_str_mv	10.1088/0004-6256/141/2/53
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subjects	AMPLITUDES ASTROPHYSICS, COSMOLOGY AND ASTRONOMY CEPHEIDS GRAVITATION MAIN SEQUENCE STARS PULSATING VARIABLE STARS SPECTRA STARS STELLAR ACTIVITY VARIABLE STARS
title	Spectra of Type II Cepheid Candidates and Related Stars
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