Abstract

Comparative analysis of atmospheric parameters obtained from the photometric and spectroscopic techniques

Cynthia Genest-Beaulieu (Université de Montréal)

Pierre Bergeron (Université de Montréal)

We present a comparative analysis of atmospheric parameters obtained with the so-called photometric and spectroscopic techniques. We used the photometric and spectroscopic data of DA white dwarfs from the Data Release 7 of the Sloan Digital Sky Survey (SDSS). We first test the calibration of the observed ugriz photometry by comparing it to the predicted synthetic photometry. We then study the well known high log g problem, which can be solved by applying published correction functions that take into account 3D hydrodynamical effects. We also exploit the sensitivity of the Balmer jump to surface gravity, using the (u-g) color index, to study the high log g problem from another angle.

Mode of presentation: poster