HR 1099 - A multi-wavelength study of a short period RS CVn binary

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The launch of AXAF in the summer of 1999 will open a new era in the study of stellar coronae. The active RS CVn binary HR 1099 is one of the AXAF primary calibration targets that will be observed in the first 3-4 months of the mission. We propose to carry out a ground based spectroscopic study of HR 1099. With the combination of optical and X- ray observations we will be able to : (i) Study the effects of rotational modulation in photospheric (TiO bands), chromospheric (H(alpha), Ca II H& K) and coronal lines (e.g. Fe XVII) (ii) Carry out a near simultaneous estimate of photospheric and coronal abundances (iii) Investigate whether the absorption features that cross the H(alpha) profile are due to cool hydrogen prominences or mass transfer between the components of the binary. The requested observing time will allow us to cover ~ 3 rotational revolutions with an ~ 80% phase coverage.

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