TAOS Delta Sct Stars and a Revised Catalog of All Known Delta Sct Stars
People:
Yong-Ik Byun and TAOS collaboration, Dae-Won Kim, Charles Alcock, Pavlos Protopapas.In this project, we analyzed data accumulated during 2005 and 2006 by the Taiwan-American Occultation Survey (TAOS) in order to detect short-period variable stars (periods of <= 1 hour) such as Delta Sct. TAOS is designed for the detection of stellar occultation by small-size Kuiper Belt Objects (KBOs) and is operating four 50cm telescopes at an effective cadence of 5Hz. The four telescopes simultaneously monitor the same patch of the sky in order to reduce false positives.
To detect these short-period variables, we used the Fast Fourier Transform algorithm (FFT) inasmuch as the data points in TAOS light-curves are evenly spaced. Using FFT, we found 41 short-period variables with amplitudes smaller than a few hundredths of a magnitude and periods of about an hour, which suggest that they are low-amplitude Delta Sct stars (LADS). During the analysis, we found one B8 Delta Sct star, which is the bluest Delta Sct star ever detected.
We present a revised catalog of all known Delta Sct stars including our detections and preexisting Delta Sct catalogs, and its statistical properties. We also cross-matched all the Delta Sct stars in the new catalog with several X-ray catalogs and found 46 X-ray counterparts. Among the cross-matched X-ray sources, we found five eclipsing binary stars (e.g. W UMa and Algol), two Herbig Ae stars and two cataclysmic variables (CV). Because of their rarity and uniqueness in showing Delta Sct pulsation and X-ray emission at the same time, all the X-ray counterparts are interesting objects for further observation and studies.
To see a list of the 41 TAOS Delta Sct Stars and their light-curves click here.
The paper is submitted to Astronomical Journal.
Publications:
No publications are listed for this project.
Last Updated at: 2009-09-29 05:15 PM.