Fiber-optic-echelle-CCD spectral monitoring of UX ARIETIS

Details Fiber-optic-echelle-CCD spectral monitoring of UX ARIETIS Fiber-optic-echelle-CCD spectral monitoring of UX ARIETIS

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1398h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Oct. 1989, p. 1398-1408.

Physics

Optics

32

Binary Stars, Stellar Physics, Stellar Spectra, Charge Coupled Devices, Emission Spectra, Fiber Optics, H Beta Line, Line Spectra

Scientific paper

Results are presented on 30 fiber-optic-echelle-CCD spectra for the UX Ari system, covering one orbit in the spring and two orbits in the fall of 1987. The spectra obtained have a resolution of about 12,000 over the range of the Ca II H lines in the near UV to the Ca II triplet in the near IR, covering several activity sensitive lines. The most striking features observed were strong H-alpha and H-beta absorption near phase 0.8, which were present at epochs eight months apart. The geometry of the system, as determined from the mass ratio, rotational velocities, and the assumption of synchronous rotation, gives a radius for the K star that is approximately filling its Roche lobe. It is suggested that the excess absorption seen is due to mass-transfer activity resulting from Roche lobe overflow of the K star and accretion onto the G star.

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