Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6414r&link_type=abstract
HST Proposal ID #6414
Computer Science
Hst Proposal Id #6414 Binaries And Star Fo
Scientific paper
The gravitationally distorted stellar components in contactbinaries power a wealth of chromospheric and transition regionlines in the UV, the profiles of which are known to vary onthe binary period. However, whilst it is clear that there isspatial structure associated with this emission, itsdistribution within each region is poorly defined. Since mostcontact binaries are at least partially eclipsing, they arevery amenable to eclipse mapping studies, but if combined withradial velocity information, Doppler imaging can also beemployed, providing a powerful, complementary tool to probesuch structure. To date, the combination of both high S/Nand well phase-resolved spectra required to exploit thistechnique has not been possible with IUE. Our objective is totake advantage of both the enhanced sensitivity and temporalresolution available with HST to secure highly phase resolved(<=6 %) high dispersion (0.1Angstrom) HRS spectra of the bright,late (W-type) contact binary, BW Dra, to reconstructemissivity maps in two key UV lines which trace outtemperature structure over the surface of the two stars.Specifically, we aim to compare the chromospheric andtransition region emissivity patterns associated with theconnecting neck between the stars, temperature gradientsacross the binary and with active regions.
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