Using the 1-m telescope at Ritter Observatory, 36 observations of zeta (2) Coronae Borealis were taken with a fiber-fed echelle spectrograph. From these observations, zeta (2) CrB was found to be a triple system and a new spectroscopic orbit was calculated. This orbit has two periods, a 1.72357 day period for the inner binary composed of zeta (2) CrB A & B and a 251 day period for the outer binary composed of zeta (2) CrB AB & C. The inner binary period is significantly shorter than the 12.5842 day period previously calculated by Abhyankar & Sarma (1966, MNRAS, 133, 437). The inner binary possesses an essentially circular orbit (e = 0.01) while the outer binary has an eccentric orbit (e = 0.48). From the widths of their Si II 6371 Angstroms lines, the vsin i's were calculated to be 42--51 km s(-1) for zeta (2) CrB A and 7--8 km s(-1) for zeta (2) CrB B. As zeta (2) CrB A & B have similar masses, their different rotational velocities make this system a sensitive test of synchronization theories.
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 1996