Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-09-29
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
14 pages, 5 figures, published in Publications of the Astronomical Society of the Pacific, v.121, p.1076 (October 2009)
Scientific paper
10.1086/630211
We present the results of a two-year, multisite observing campaign investigating the high-amplitude delta Scuti star VX Hydrae during the 2006 and 2007 observing seasons. The final data set consists of nearly 8500 V-band observations spanning HJD 2453763.6 to 2454212.7 (2006 January 28 to 2007 April 22). Separate analyses of the two individual seasons of data yield 25 confidently-detected frequencies common to both data sets, of which two are pulsation modes, and the remaining 23 are Fourier harmonics or beat frequencies of these two modes. The 2006 data set had five additional frequencies with amplitudes less than 1.5 mmag, and the 2007 data had one additional frequency. Analysis of the full 2006-2007 data set yields 22 of the 25 frequencies found in the individual seasons of data. There are no significant peaks in the spectrum other than these between 0 and 60 c/d. The frequencies of the two main pulsation modes derived from the 2006 and 2007 observing seasons individually do not differ at the level of 3-sigma, and thus we find no conclusive evidence for period change over the span of these observations. However, the amplitude of f(1) = 5.7898 c/d changed significantly between the two seasons, while the amplitude of f(0) = 4.4765 c/d remained constant; amplitudes of the Fourier harmonics and beat frequencies of f(1) also changed. Similar behavior was seen in the 1950s, and it is clear that VX Hydrae undergoes significant amplitude changes over time.
Butterworth Neil
Dvorak Shawn
Gerner H.
Poklar R.
Samolyk Gerard
No associations
LandOfFree
The pulsation spectrum of VX Hydrae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The pulsation spectrum of VX Hydrae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The pulsation spectrum of VX Hydrae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-665162