FUSE Determination of the Abundances of Iron-Peak Elements in the PG 1716+426 Stars
Abstract
We present preliminary analysis of the FUSE spectra of five PG 1716+426 stars, the subgroup of sdB stars that exhibit very low amplitude, long-period multiperiodic luminosity variations. Our aim is to investigate whether these stars display abundances of iron-peak elements which differ from those observed in the shorter-period EC 14026 stars and in non-variable sdB stars. Our preliminary results suggest that the abundances of Fe, Mn, Co and Ni in PG 1716+426 stars do not differ appreciably from those measured in our reference samples. The implications of these findings for non-adiabatic calculations which link the driving of both the long- and short-period pulsations to an opacity bump associated with a local enhancement of the abundance of iron and iron-peak elements in the envelope are briefly discussed.
- Publication:
-
Baltic Astronomy
- Pub Date:
- 2006
- Bibcode:
- 2006BaltA..15..301B
- Keywords:
-
- stars: hot subdwarfs;
- stars: abundances;
- stars: oscillations;
- techniques: spectroscopic;
- stars: individual (PG 1716+426;
- PG 1627+017;
- PG 1338+481;
- PG 0101+039;
- PHL 457)