A high resolution spectroscopic study of XX Ophiuchi

Abstract

The star XX Oph has been known to exhibit peculiar spectral variabilities since the work of Merrill in 1924. A high resolution spectroscopic study of the XX Oph spectra taken in July 1996 and later in June 1997 also exhibit distinctly different line profiles in several spectral regions, the most pronounced variations being in the sodium D and H? profiles. We have estimated the displacement velocities of the strong emission line profiles and their absorption components whenever possible and made an attempt to examine possible physical scenarios that can account for its peculiar variability.