Discovery of eleven new ZZ Ceti stars
Abstract
We report the discovery of eleven new ZZ Cetis using telescopes at OPD (Observat\'orio do Pico dos Dias/LNA) in Brazil, the 4.1 m SOAR (Southern Astrophysical Research) telescope at Cerro Pachon, Chile, and the 2.1 m Otto Struve telescope at McDonald observatory. The candidates were selected from the SDSS (Sloan Digital Sky Survey) and SPY (ESO SN Ia progenitor survey), based on their Teff obtained from optical spectra fitting. This selection criterion yields the highest success rate of detecting new ZZ Cetis, above 90% in the Teff range from 12000 to 11000 K. We also report on a DA not observed to vary, with a Teff placing the star close to the blue edge of the instability strip. Among our new pulsators, one is a little bit cooler than this star for which pulsations were not detected. Our observations are an important constraint on the location of the blue edge of the ZZ Ceti instability strip.
Cite
@article{arxiv.astro-ph/0511804,
title = {Discovery of eleven new ZZ Ceti stars},
author = {B. G. Castanheira and S. O. Kepler and F. Mullally and D. E. Winget and D. Koester and B. Voss and S. J. Kleinman and A. Nitta and D. J. Eisenstein and R. Napiwotzki and D. Reimers},
journal= {arXiv preprint arXiv:astro-ph/0511804},
year = {2009}
}
Comments
10 pages, 3 figures, to be published in A&A