Metal-Poor Type II Cepheids with Periods Less Than Three Days

Bibliographic Details
Title: Metal-Poor Type II Cepheids with Periods Less Than Three Days
Authors: Kovtyukh, V., Wallerstein, G., Yegorova, I., Andrievsky, S., Korotin, S., Saviane, I., Belik, S., Davis, C. E., Farrell, E. M.
Publication Year: 2018
Collection: Astrophysics
Subject Terms: Astrophysics - Solar and Stellar Astrophysics
More Details: We have analysed 10 high resolution spectra of Type II Cepheids with periods less than 3 days. We find that they clearly separate into two groups: those with near or slightly below solar metallicities, and those with [Fe/H] between --1.5 and --2.0. While the former are usually called BL~Her stars, we suggest that the latter be called UY~Eri stars. The UY~Eri subclass appears to be similar to the short period variables in globular clusters of the Galactic Halo. Globular clusters with [Fe/H] $\textgreater$ --1.0 almost never have Type II Cepheids.
Document Type: Working Paper
DOI: 10.1088/1538-3873/aaacf7
Access URL: http://arxiv.org/abs/1803.05041
Accession Number: edsarx.1803.05041
Database: arXiv
More Details
DOI:10.1088/1538-3873/aaacf7