Time-Series Spectroscopy of the subdwarf B Star PG 1219+534
We report on the progress of the analysis of our time-series spectroscopy of the pulsating sdB star PG 1219+534. PG 1219+534 has four stable pulsation frequencies (6721, 6961, 7490, and 7807 μHz) with nearly constant photometric amplitudes. The pulsation spectrum is simple enough to be resolved within a couple of hours, yet complex enough that multiple -degrees must be present. Our data set consists of 5072 spectra obtained in April 2004 from the Mayall 4m at Kitt Peak National Observatory (KPNO), at 1.4˚A/pixel resolution, and the Nordic Optical Telescope (NOT), with 0.8˚A/pixel resolution. Though still under analysis, we have already measured line-centroid variations to discern pulsation velocities using Balmer and He I lines between 3750 and 5000 ˚A.
Physics, Astronomy, and Materials Science
Eggen, Joseph R., M. D. Reed, S. J. O'Toole, J. H. Telting, R. Østensen, D. M. Terndrup, S. L. Harms, A-Y. Zhou, and R. L. VanWey. "Time-Series Spectroscopy of the subdwarf B Star PG 1219+ 534." Communications in Asteroseismology 150 (2007): 271.
Communications in Asteroseismology