Accretion in the Interacting Binary UX Monocerotis

Details Accretion in the Interacting Binary UX Monocerotis Accretion in the Interacting Binary UX Monocerotis

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6493p&link_type=abstract

HST Proposal ID #6493

Computer Science

Hst Proposal Id #6493 Binaries And Star Fo

Scientific paper

We plan to use the GHRS spectrograph in order to obtainhigh-S/N UV spectra in two segments at three orbitalphases of the interacting binary UX Monocerotis. This systemis an intermediate case between the weakly interactingordinary Algols and the strongly interacting W Serpentissystems (``hyperactive Algols''). This means that the rate ofmass transfer is rather high to produce observable effects,yet the component stars are not completely obscured by thecircumstellar matter, so that the fundamental parameters ofthe binary system are known. As such, UX Mon offers a rareopportunity to study mass transfer processes in interactingbinaries: the mass-transfering stream, the impact region onthe gainer, the ``splashed'' disk, and the outflowing streamor induced wind. These phenomena can be studied by analyzingand modeling suitably selected emission (and absorption) linesobserved from different points of view, i.e. at severalorbital phases. A recent study of W Serpentis suggests twoemitting regions: the impact area and the disk boundary layer.In UX Mon, we can study these regions much morequantitatively, since the system parameters are much betterdefined and known. For analysis and modeling we have excellentprograms, considerable experience, and extensive supportingdata, photometric as well as spectroscopic.

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