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astro-ph1999
Young Binary Stars and Associated Disks
Robert D. Mathieu, Andrea M. Ghez, Eric L. N. Jensen +1
The typical product of the star formation process is a binary star. Binaries have provided the first dynamical measures of the masses of pre-main-sequence (PMS) stars, providing su…
astro-ph1999
Optical spectroscopy of X-ray sources in the old open cluster M67
Maureen van den Berg, Frank Verbunt, Robert D. Mathieu
We have obtained optical spectra of seven stars in the old galactic cluster M67 that are unusual sources of X-rays, and investigate whether the X-ray emission is due to magnetic ac…