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A multiwavelength campaign of active stars with intermediate rotation ratesNear-to-simultaneous ultraviolet and visual spectroscopy of two moderate nu(sin i) RS CVn systems, V815 Herculis (nu(sin i) = 27 km s(exp -1)) and LM Pegasi (nu(sin i) = 24 km s(exp -1)), are presented along with contemporaneous UBV (RI)(sub c) - band photometry. These data were used to probe inhomogeneities in the chromospheres and photospheres, and the possible relationship between them. Both systems show evidence for rotationally modulated chromospheric emission, generally varying in antiphase to the photospheric brightness. A weak flare was observed at Mg II for V815 Her. In the case of IM Peg, we use photometry and spectra to estimate temperatures, sizes, and locations of photospheric spots. Further constraints on the spot temperature is provided by TiO observations. For IM Peg, the anticorrelation between chromospheric emission and brightness is discussed in the context of a possible solar-like spot cycle.
Document ID
19960013898
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor Report (CR)
Authors
Dempsey, Robert C.
(Space Telescope Science Inst. Baltimore, MD United States)
Neff, James E.
(Pennsylvania State Univ. University Park, PA United States)
ONeal, Douglas
(Pennsylvania State Univ. University Park, PA United States)
Olah, Katalin
(Konkoly Observatory Budapest, Hungary)
Date Acquired
September 6, 2013
Publication Date
April 1, 1995
Subject Category
Astronomy
Report/Patent Number
NAS 1.26:199871
NASA-CR-199871
NAS 1.26:199871
Report Number: NAS 1.26:199871
Report Number: NASA-CR-199871
Report Number: NAS 1.26:199871
Accession Number
96N19048
Funding Number(s)
CONTRACT_GRANT: NAS5-32487
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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