POSTER PAPER 5.16
Do Stellar X-ray Observations Provide Evidence for Solar-like Cycles?
Robert A. Stern, David Alexander, Loren W. Acton
Institute: Lockheed Martin Solar and Astrophysics Laboratory
Institute: Montana State University
Contact Email: stern@lmsal.com
Abstract:
Utilizing 10 years of Yohkoh data, spanning nearly a complete solar
cycle, we investigate the statistical variations of solar X-ray fluxes in the
stellar context. The Yohkoh soft X-ray data can be described by the
combination of a smoothly varying function representing the solar cycle plus
a lognormal distribution representing the day-to-day variability in the
lowest energy bands. Using data from the SXT filter which most closely
resembles the ROSAT PSPC or Einstein IPC bandpasses, we examine the
distribution of two "snapshot" samples of the Sun's X-ray emission taken at
varying points in the cycle. Comparison with the ROSAT and Einstein
"snapshots" of Hyades G stars strongly suggests that these more active
"suns" have very long cycles, weak or no cycles, or cycles which are
integral or sub-multiples of the solar cycle
Index Keywords: Sun; Hyades; Stellar Activity
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Manuscript submitted: 2001-Aug-20
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.