Blue Edge of the ZZ Ceti Instability Strip Versus Mass

Details Blue Edge of the ZZ Ceti Instability Strip Versus Mass Blue Edge of the ZZ Ceti Instability Strip Versus Mass

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998balta...7..131g&link_type=abstract

Baltic Astronomy, v.7, p.131-140.

Astronomy and Astrophysics

Astronomy

22

Stars: White Dwarfs, Fundamental Parameters, Variables

Scientific paper

In this work we test the theoretical results derived from pulsation models in which the blue edge temperature of the ZZ Ceti instability strip depends on the stellar mass. By using the fundamental parameters (Teff and M) and the results of the time series photometry of a sample of DA stars, we found all the ZZ Ceti stars in our sample but one (G 226-29) fall inside the instability strip if the theoretical blue edge is shifted by 300 K to higher temperature. Our biggest sources of uncertainty are in the Teff and M determinations, but by assuming that the relative ordering in the temperature among the ZZ Ceti stars is reliable, we conclude that the instability strip boundaries depend on stellar mass.

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