Do Stellar X-ray Observations Provide Evidence For Solar-like Cycles?

Details Do Stellar X-ray Observations Provide Evidence For Solar-like Cycles? Do Stellar X-ray Observations Provide Evidence For Solar-like Cycles?

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..906s&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

2

Sun, Hyades, Stellar Activity

Scientific paper

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.

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