SIMBAD references

2007A&A...461.1095C - Astronomy and Astrophysics, volume 461, 1095-1102 (2007/1-3)

Asteroseismological constraints on the pulsating planetary nebula nucleus (PG1159-type) RXJ2117.1+3412.


Abstract (from CDS):

We present asteroseismological inferences on RXJ2117.1+3412, the hottest known pulsating PG1159 star. Our results are based on full PG1159 evolutionary models recently presented by Miller Bertolami & Althaus (2006A&A...454..845M). We performed extensive computations of adiabatic g-mode pulsation periods on PG1159 evolutionary models with stellar masses ranging from 0.530 to 0.741M. PG1159 stellar models are extracted from the complete evolution of progenitor stars started from the ZAMS, through the thermally pulsing AGB and born-again phases to the domain of the PG1159 stars. We constrained the stellar mass of RXJ2117.1+3412 by comparing the observed period spacing with the asymptotic period spacing and with the average of the computed period spacings. We also employed the individual observed periods to find a representative seismological model for RXJ2117.1+3412.We derive a stellar mass M*∼0.56-0.57M from the period spacing data alone. In addition, we found a best-fit model representative for RXJ2117.1+3412 with an effective temperature Teff=163400K, a stellar mass M*=0.565M, and a surface gravity logg=6.61. The derived stellar luminosity and radius are log (L*/L)=3.36 and log(R*/R)=-1.23, respectively, and the He-rich envelope thickness is Menv=0.02M. We derive a seismic distance d∼452pc and a linear size of the planetary nebula DPN∼1.72pc. These inferences seem to solve the discrepancy between the RXJ2117.1+3412 evolutionary timescale and the size of the nebula. All of the seismological tools we use concur to the conclusion that RXJ2117.1+3412 must have a stellar mass M*∼0.565M, much in agreement with recent asteroseismology studies and in clear conflict with the predictions of spectroscopy plus evolutionary tracks.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: interiors - stars: oscillations - planetary nebulae: general

Errata: erratum vol. 470, p. 1031 (2007)

Simbad objects: 6

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