Setting null limits on pulsation in the twin F0 stars Gamma-Vir N/S

Details Setting null limits on pulsation in the twin F0 stars Gamma-Vir N/S Setting null limits on pulsation in the twin F0 stars Gamma-Vir N/S

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1943s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Dec. 1990, p. 1943-1950. Research supported by the Computer Sciences Corp.

Computer Science

3

Binary Stars, Data Reduction, Hertzsprung-Russell Diagram, Stellar Oscillations, Stellar Rotation, Variable Stars, Charge Coupled Devices, Line Shape, Pixels, Radial Velocity

Scientific paper

Novel observing and data-reduction methods have been explored to optimize the detection of pulsation modes in rotating stars. The first technique consisted of placing the twin components of the visual binary Gamma Vir on a spectrograph slit and analyzing the differenced radial velocities from the resulting stacked pairs of spectra on a CCD. This procedure was successful only to a point because of thermally imposed differential shifts across the detector with time. The second technique made use of the CLEAN algorithm to analyze time series of intensity fluctuations of pixels on line profiles. This application was quite successful. Provided that simple precautions are taken in data reductions, it is possible to achieve photon-limited performance with a single pixel, and very nearly so for an ensemble of pixels on lines located within the central region of the CCD. Results are calibrated against model line profiles with simulated noise and determine threshold detections for nonradial/radial pulsation modes.

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