Many extremely low-mass (ELM) white-dwarf (WD) stars are currently being found in the field of the Milky Way. Some of these stars exhibit long-period nonradial g-mode pulsations, and constitute the class of ELMV pulsating WDs. In addition, several low-mass pre-WDs, which could be precursors of ELM WDs, have been observed to show short-period photometric variations likely due to nonradial p modes and radial modes. They could constitute a new class of pulsating low-mass pre-WD stars, the pre-ELMV stars. Here, we present the recent results of a thorough theoretical study of the nonadiabatic pulsation properties of low-mass He-core WDs and pre-WDs on the basis of fully evolutionary models representative of these stars.
@article{arxiv.1609.01352,
title = {Recent advances in the theoretical modeling of pulsating low-mass He-core white dwarfs},
author = {A. H. Córsico and L. G. Althaus and L. M. Calcaferro and A. M. Serenelli and S. O. Kepler and C. S. Jeffery},
journal= {arXiv preprint arXiv:1609.01352},
year = {2016}
}
Comments
6 pages, 2 figures, 1 table. To appear in the proceedings of "The 20th European Workshop on White Dwarfs", Warwick, United Kingdom, July 25-29th, 2016