The Nature of the Driving Mechanism in the Pulsating Hybrid PG 1159 Star Abell 43

Details The Nature of the Driving Mechanism in the Pulsating Hybrid PG 1159 Star Abell 43 The Nature of the Driving Mechanism in the Pulsating Hybrid PG 1159 Star Abell 43

2005-05-29

arxiv.org/abs/astro-ph/0505582v1

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure, Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20053394

We extend our previous pulsational stability analyses of PG 1159 stars by modeling the hybrid PG 1159 type star Abell 43. We show that the standard kappa-mechanism due to the ionization of C and O in the envelope of this H-rich PG 1159 star is perfectly able to drive g-mode pulsations. Thus, contrary to a recent suggestion, there is no need to invoke any new or exotic mechanism to explain the pulsational instabilities observed in this particular star. Our expected instability band for l = 1 modes extends in period from ~ 2604 s to ~ 5529 s, which is consistent with the available photometric observations of Abell 43. We also suggest that efforts to detect luminosity variations in its sibling NGC 7094 be pursued.

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