Analysis of 1988 and 1989 Measurements of Stellar Spectra with the Lowell Observatory/High Altitude Observatory Solar-Stellar Spectograph

摘要

In 1984, an ambitious program involving scientists from the High Altitude Observatory, at NCAR, Pennsylvania State University, Lowell Observatory, and Sacramento Peak Observatory, was initiated for the purpose of monitoring solar-like activity in a large number of stars. A fiber-optic fed echelle spectrograph, designed at Pennsylvania State and constructed at HAO, provides 20 spectral orders sampled from the spectral range of approximately 9200-5000 angstroms. The solar-stellar spectrograph (SSS) was operated initially during the fall seasons of 1988 and 1989 at Lowell Observatory, Flagstaff, Arizona. Although substantial data were obtained during these periods, a full-scale effort to reduce the data to useful form was not initiated until the spring of 1991. Initial efforts at data reduction suggested that a number of problems were present. Prospects for restarting SSS observations in 1992 prompted a renewed effort at HAO, beginning in 1991, to track down the sources of difficulty in the data. The report discusses the effort and the results.