Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934816t&link_type=abstract
American Astronomical Society, AAS Meeting #219, #348.16
Other
Scientific paper
We investigate low-frequency variability in a large sample of Mira and semiregular variables with long-term visual light curves from the AAVSO International Database. Our aim is to determine whether we can detect and measure long-timescale variable phenomena in these stars, for example photometric variations that might be associated with supergranular convection. We analyzed the long-term light curves of 522 variable stars of the Mira and SRa, b, c, and d classes. We calculated their low-frequency time-series spectra to characterize rednoise with the power density spectrum index, and then correlate this index with other observable characteristics such as spectral type and primary pulsation period. In our initial analysis of the sample, we see that the semiregular variables have a much broader range of spectral index than the Mira types, with the SRb subtype having the broadest range. Among Mira variables we see that the M- and S-type Miras have similarly wide ranges of index, while the C-types have the narrowest with generally shallower slopes. There is also a trend of steeper slope with larger amplitude, but at a given amplitude, a wide range of slopes are seen. The ultimate goal of the project is to identify stars with strong intrinsic red noise components as possible targets for resolved surface imaging with interferometry.
Karovska Magarita
Templeton Matthew R.
Waagen Elizabeth O.
No associations
LandOfFree
Low-Frequency Temporal Variability in Mira and Semiregular Variables 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 Low-Frequency Temporal Variability in Mira and Semiregular Variables, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-Frequency Temporal Variability in Mira and Semiregular Variables will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1582100