ABELL 43 a second pulsating "hybrid PG 1159 star"

Details ABELL 43 a second pulsating "hybrid PG 1159 star" ABELL 43 a second pulsating "hybrid PG 1159 star"

2005-01-13

arxiv.org/abs/astro-ph/0501249v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures Accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20041999

We report observations of the planetary nebula nucleus Abell 43, obtained at the 2.5m Nordic Optical Telescope, which shows that it is a pulsator. Abell 43, a "hybrid-PG 1159" type star, is the second pulsator of this class, after HS 2324+3944. From the limited data set aquired, we find that Abell 43 exhibits at least two periods of 2600s and 3035s, the longest ones observed up to now in PG 1159 and "hybrid-PG 1159" pulsators. This strongly suggests that the variations are due to non-radial g-mode pulsations and cannot be a consequence of binarity. This discovery raises puzzling questions regarding the exitation mechanism in this H rich, C and O poor "hybrid-PG 1159" since the C and O abundances are too low to trigger the instability through the $\kappa$-mechanism invoked to explain the instability in the PG 1159 stars and in the previously known "hybrid-PG 1159" pulsator HS 2324+3944.

Affiliated with

Also associated with

No associations

Rating

ABELL 43 a second pulsating "hybrid PG 1159 star" does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ABELL 43 a second pulsating "hybrid PG 1159 star", we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ABELL 43 a second pulsating "hybrid PG 1159 star" will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-273613