Gravity Probe B Photometry and Observations of ζ Pegasi: An SPB Variable Star

Details Gravity Probe B Photometry and Observations of ζ Pegasi: An SPB Variable Star Gravity Probe B Photometry and Observations of ζ Pegasi: An SPB Variable Star

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasp..119..483g&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 119, Issue 855, pp. 483-493.

Astronomy and Astrophysics

Astronomy

Stars

Scientific paper

The Gravity Probe B (GP-B) satellite photometric system and instrumentation are introduced. Observational results are presented for calibration stars demonstrating a single-orbit relative photometric precision capability of 500 μmag for bright stars. Broadband photometric observations of the bright star ζ Pegasi are then presented that display brightness variability of 488.2 +/- 6.6 μmag (parts per million), with a period of 22.952 +/- 0.804 hr (f ~ 1.04566 cycles day-1). Over the short observational period, the variation is monosinusoidal, thus recommending the star for membership in the class of small-amplitude, slowly pulsating B (SPB) star variables oscillating in a nonradial g-mode.

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