The 2006-2007 Observing Campaign On VX Hydrae

Details The 2006-2007 Observing Campaign On VX Hydrae The 2006-2007 Observing Campaign On VX Hydrae

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360206t&link_type=abstract

American Astronomical Society, AAS Meeting #213, #602.06

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Scientific paper

We present the results of the 2006-2007 observing campaign on the double-mode delta Scuti star VX Hydrae. Nearly 8800 V-band CCD observations were obtained during the two observing seasons. Although the data were taken with small telescopes (0.3-m or less, using consumer-grade CCD cameras), the data quality is very high, enabling the detection of variability at the millimagnitude level at some frequencies. Analysis of the data yields only two primary pulsation frequencies: f(0) = 4.4765 c/d, and f(1) = 5.7899 c/d. The two modes have comparable amplitude, although the amplitude of f(1) appears to have increased slightly from 2006 to 2007 by 0.01 mag. Only two pulsation modes are detected, but at least 18 additional linear combination frequencies are also clearly detected, some having amplitudes as low as 1 mmag, resulting in an incredibly rich Fourier spectrum. We discuss the evidence for amplitude variation in VX Hydrae, along with prospects for future study of this and other similar delta Scuti stars by AAVSO observers.

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