CDROM/AJ/V109/P1269 Streams and Disks in Binary Stars (Etzel+ 1995) ================================================================================ O I Lambda 7774 Absorption as a Tracer of Streams and Disks in Nondegenerate Binary Stars Paul B. Etzel, Edward C. Olson, & Matthew C. Senay <1995, AJ, 109, 1269> =1995AJ....109.1269E ================================================================================ Abstract: We propose a new spectroscopic approach for observing circumstellar matter in binary stars, based on the neutral oxygen lambda 7774 absorption lines. We present oxygen equivalent widths and radial velocities in 20 nondegenerate eclipsing binaries. We note limitations and advantages of using this line to trace circumstellar matter in binary systems, and confirm the presence of streams and rotating accretion disks in a number of short- and long-period Algol systems. We discuss evidence for geometrically thick disks, and describe a small radial infall superimposed on disk rotation in most long-period systems. We speculate that infall may be related to viscous dissipation in disks. We emphasize the great sensitivity of lambda 7774 in studying the kinematics of circumstellar matter in many nondegenerate binary stars. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table.dat 64 589 Equivalent widths and radial velocities -------------------------------------------------------------------------------- Byte-by-byte Description of file: table.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-10 A10 --- Name Variable star name 11-30 A20 --- UT UT date and time of observation 31-41 F11.5 d HJD Heliocentric Julian Date of observation 42-49 F8.5 --- Phase Phase 50-56 A7 0.1nm EW Absorption equivalent width 57-64 A8 km/s RV Radial velocity -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 03-May-1995