Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265...81j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 265, p. 81
Astronomy and Astrophysics
Astronomy
8
Binary Stars, Extreme Ultraviolet Radiation, X Ray Stars, Ultraviolet Astronomy, Stellar Rotation, Astronomical Photography, Rosat Mission
Scientific paper
We report on the discovery of a new, very short-period, chromospherically active, late-type binary system. Observations performed with the ROSAT Wide Field Camera revealed the EUV source RE 0618 + 75, and subsequent optical spectroscopy identified this source as a chromospherically active, double dMe star with intense Ca II H and K and H-alpha emission lines. Further spectroscopy revealed that the object is a binary system with a period of 0.539 d, a mass ratio of unity and a systemic velocity of -14 km/s. Spectral types of M3 for both components are deduced from low-resolution spectra, and this yields a system inclination of 34 deg and component separation of 2.4 solar radii. RE 0618 + 75 is the most rapidly rotating, binary dMe system known, yet the magnetic activity observed is no greater than many similar, but more slowly rotating, dMe stars. This reinforces the concept of activity saturation in rapidly rotating stars.
Bromage Gordon E.
Elliott K. H.
Jeffries Robin D.
Kellett Barry J.
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