Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5822k&link_type=abstract
HST Proposal ID #5822
Computer Science
Hst Proposal Id #5822 Hot Stars
Scientific paper
Mira AB system belongs to a class of detached binaries where a compact object, possibly a white dwarf, accretes mass from the wind of a cool giant or supergiant. This system is an ideal case for detailed study of accretion processes in binaries because it is the only case of a wind accreting object that can be easily resolved using the HST. We propose to carry out multiwavelength observations of the components of the Mira AB system using the HST FOC camera to study the accretion processes in this system and explore, for the first time, the extended atmosphere of Mira A (the prototype of Mira-type variables) at UV wavelengths. HST observations are essential for successful accomplishment of this project because important spectral diagnostics of Mira A and Mira B occur in the UV. In addition, HST presents a unique opportunity of observing Mira B at UV and optical wavelengths uncontaminated by the red giant. The principal goals of this project are: (1) to determine the the accretion luminosity of Mira B at UV and optical wavelengths, (2) to test the viability of wind accretion models, (3) to determine the nature of the accreting star, and (4) to measure the apparent diameter of Mira A as a function of wavelength and to image the asymmetries in its atmosphere.
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