Photometric observations of the nucleus of IC 418.

Details Photometric observations of the nucleus of IC 418. Photometric observations of the nucleus of IC 418.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..161k&link_type=abstract

Astronomy and Astrophysics, v.319, p.161-165

Astronomy and Astrophysics

Astrophysics

1

Stars: Post-Agb, Oscillations, Mass-Loss, Individual: Hd 35914, Planetary Nebulae: Individual: Ic 418

Scientific paper

We discuss the observational characteristics of a recently proposed class of variable central stars of planetary nebulae. We summarize previous observations of the nucleus of IC 418, a prototype star of this class, and we analyze new photometry of this object, obtained in 1989 and 1991. We confirm that the characteristic timescale of the photometric variations is a few hours. No single period can fit all of our observational runs, implying that the variability is either irregular or multimodal. We discuss two possible explanations of the observed phenomena: (i) an unstable, radiatively driven wind and (ii) pulsational instability driven by the κ-mechanism. We also consider the possibility that the observed variability is produced by a combination of both mechanisms and that they may influence each other.

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