Doubling the number of DBVs and a closer look at their Instability Strip

Details Doubling the number of DBVs and a closer look at their Instability Strip Doubling the number of DBVs and a closer look at their Instability Strip

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007coast.150..249n&link_type=abstract

Communications in Astroseismology, Vol. 150, p.249

Astronomy and Astrophysics

Astronomy

4

Scientific paper

Prior to the Sloan Digital Sky Survey (SDSS), there were only nine known DBVs compared to 35 DAVs. The latest SDSS DR4 White Dwarf Catalogue (Eisenstein et al. 2006) has quadrupled the number of known white dwarf stars. We have been searching for new DBVs from the SDSS catalogue. Increased numbers of DBVs will help us better understand the structure and evolution of DBs, the nature of their instability strip as well as plasmon neutrino processes (Winget et al. 2004). We searched for DBV candidates using effective temperatures and surface gravities determined by fitting SDSS spectra with Koester's atmosphere models. We then obtained time-series photometric data on those with fit temperatures near those of the known pulsators. So far we have discovered 8 new DBVs, nearly doubling the number of previously known DBVs. With increased numbers of DBVs, we will be able to better characterize the instability strip, but, we also need more precise determinations of the temperatures and surface gravities via better signal to noise spectra and better lower limits for the observed non-variables. This effort is ongoing.

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