Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501

Details Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501 Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501

1996-09-04

arxiv.org/abs/astro-ph/9609024v2

Astronomy and Astrophysics

Astrophysics

12 pages, AASTEX, 7 tables, 6 EPS figures, to appear in AJ, 12/96 Corrected version repairs table formatting and adds missing

Scientific paper

10.1086/118214

We report on a global CCD time-series photometric campaign to decode the pulsations of the nucleus of the planetary nebula NGC1501. The star is hot and hydrogen-deficient, similar to the pre-white-dwarf PG 1159 stars. NGC1501 shows pulsational brightness variations of a few percent with periods ranging from 19 to 87 minutes. The variations are very complex, suggesting a pulsation spectrum that requires a long unbroken time series to resolve. Our CCD photometry of the star covers a two-week period in 1991 November, and used a global network of observatories. We obtained nearly continuous coverage over an interval of one week in the middle of the run. We have identified 10 pulsation periods, ranging from 5235 s down to 1154 s. We find strong evidence that the modes are indeed nonradial g-modes. The ratios of the frequencies of the largest-amplitude modes agree with those expected for modes that are trapped by a density discontinuity in the outer layers. We offer a model for the pulsation spectrum that includes a common period spacing of 22.3 s and a rotation period of 1.17 days; the period spacing allows us to assign a seismological mass of 0.55+/-0.03 Msun.

Affiliated with

Also associated with

No associations

Rating

Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501 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 Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-321215