2005/11/29 by B. G. Castanheira, S. O. Kepler, F. Mullally +8 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Instability strip #Sky #Spectral line #Stars #Stellar evolution #Stellar, planetary, and galactic studies #Telescope #White dwarf #astro-ph
paper · pdf · doi:10.1051/0004-6361:20053500
10 pages, 3 figures, to be published in A&A
arxiv created 2005/11/29 · openalex publication_date 2006/04/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the discovery of eleven new ZZ Cetis using telescopes at OPD (Observatório 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 obtained from optical spectra fitting. This selection criterion yields the highest success rate of detecting new ZZ Cetis, above 90% in the range from 12 000 to 11 000 K. We also report on a DA not observed to vary, with a placing the star close to the blue edge of the instability strip. Among our new pulsators, one is slightly 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.