Non-evolutionary secular period increase in pulsating DA white dwarfs

Details Non-evolutionary secular period increase in pulsating DA white dwarfs Non-evolutionary secular period increase in pulsating DA white dwarfs

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295l..17p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 2, p. L17-L19

Astronomy and Astrophysics

Astrophysics

11

Kinematics, Radial Velocity, Secular Variations, Stellar Activity, Stellar Motions, Stellar Oscillations, White Dwarf Stars, Angular Momentum, Doppler Effect, Stellar Magnitude

Scientific paper

We show that the proper motion of a pulsating white dwarf results in a secular change of the radial velocity of the star and consequently contributes to the observed P-dot. The proper motion term is always positive and for a typical DAV white dwarf it is of the order of 10-14 to 10-15sec/s. This effect is thus comparable with the expected evolutionary period change in these stars due to their cooling, which also produces a positive period derivative, and has to be taken into account when the intrinsic P-dot is to be properly determined from the observed period change.

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