Time-Series Spectroscopy of the subdwarf B Star PG 1219+534

Details Time-Series Spectroscopy of the subdwarf B Star PG 1219+534 Time-Series Spectroscopy of the subdwarf B Star PG 1219+534

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007coast.150..271e&link_type=abstract

Communications in Astroseismology, Vol. 150, p.271

Astronomy and Astrophysics

Astronomy

Scientific paper

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 ℓ-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 1.4Å /pixel resolution, and the Nordic Optical Telescope (NOT), with 0.8Å /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 Å.

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