Oreiro, R Ulla, A Hernandez, FP MacDonald, J Ostensen, Roy Lopez, CR #
Astronomical soc pacific
14th European Workshop on White Dwarfs, Proceedings vol:334 pages:631-634
ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES
14th European Workshop on White Dwarfs Kiel, GERMANY, JUN 19-JUL 23, 2004
Balloon 090100001 is the brightest (B=11.8) pulsator sdB of the EC14026 class. Moreover, it shows a frequency mode (at 356 s, 2.81 mHz) with one of the hightest amplitude of oscillation (similar to 59 mmag) in its class. At least another frequency is present in a low resolution frequency spectrum. The physical parameters of the star (T-eff = 29446 K, log g = 5.33) may indicate that it has already crossed the Terminal Age Extended Horizontal Branch, so it would be evolving very fast towards the White Dwarf phase. We discuss this possibility and propose the object as a very interesting asteroseismology target.