Asteroseismological measurements on PG 1159-035, the prototype of the GW Vir variable stars - AstrophysicsReport as inadecuate




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Abstract: An asteroseismological study of PG 1159-035, the prototype of the GW Virvariable stars, has been performed on the basis of detailed and full PG1159evolutionary models presented by Miller Bertolami and Althaus 2006. We carriedout extensive computations of adiabatic g-mode pulsation periods on PG1159evolutionary models with stellar masses spanning the range 0.530 to 0.741 Mo.We derive a stellar mass in the range 0.56-0.59 Mo from the period-spacing dataalone. We also find, on the basis of a period-fit procedure, a seismic modelrepresentative of PG 1159-035 that reproduces the observed period pattern withan average of the period differences of 0.64-1.03 s, consistent with theexpected model uncertainties. The results of the period-fit analysis carriedout in this work suggest that the surface gravity of PG 1159-035 would be 1sigma larger than the spectroscopically inferred gravity. For our best-fitmodel of PG 1159-035, all of the pulsation modes are characterized by positiverates of period changes, at odds with the measurements by Costa and Kepler2007.



Author: A. H. Córsico, L. G. Althaus, S. O. Kepler, J. E. S. Costa, M. M. Miller Bertolami

Source: https://arxiv.org/







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