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Mass Outflow and Chromospheric Activity of Red Giant Stars in Globular Clusters I: M15
Sz. Meszaros, A. K. Dupree, A. Szentgyorgyi
High resolution spectra of 110 selected red giant stars in the globular cluster M15 (NGC 7078) were obtained with Hectochelle at the MMT telescope in 2005 May, 2006 May, and 2006 O…
The Structured Chromosphere and Wind of TW Hya
A. K. Dupree, E. H. Avrett, N. S. Brickhouse +2
A continuous set of echelle spectra of TW Hya, taken with the MIKE spectrograph on the Magellan2/Clay telescope at Las Campanas Observatory in April 2006 reveals systematic variati…
Physical parameters and multiplicity of five southern close eclipsing binaries
T. Szalai, L. L. Kiss, Sz. Meszaros +2
Aims: Detect tertiary components of close binaries from spectroscopy and light curve modelling; investigate light-travel time effect and the possibility of magnetic activity cycles…
The first year of SN 2004dj in NGC 2403
J. Vinko, K. Takats, K. Sarneczky +17
New BVRI photometry and optical spectroscopy of the Type IIp supernova 2004dj in NGC 2403, obtained during the first year since discovery, are presented. The progenitor cluster, Sa…