Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.7814l&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #78.14; Bulletin of the American Astronomical Society, Vol. 28, p.1379
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on moderate (lambda /Delta lambda = 20,000) and high (lambda /Delta lambda = 90,000) resolution spectra of the 104 day period Capella binary system (HD 34029). These spectra were obtained with the HST Goddard High Resolution Spectrometer on 1995 September 9 and 1996 April 9. The observations include a long duration moderate resolution spectrum of the coronal Fe XXI 1354 Angstroms line and one moderate resolution and one high resolution echelle spectrum of the He II 1640 Angstroms line. Our data set also includes lines of C II, O III, N IV, and O V. Our objective in observing the Fe XXI line, which is formed at T=10(7) K, was to infer the contribution of each star's corona. This is feasible because the GHRS can easily resolve the 50 km s(-1) radial velocity separation of the stars. Present day X-ray instruments and even the upcoming XMM and AXAF spectrometers cannot resolve the emission from each star. We will report on the relative contribution of each star and the Doppler shift and line width for each star. With these data we can estimate the X-ray luminosities of the G1 III and G8 III stars individually. We observed the He II 1640 Angstroms line twice with a time separation of 7 months corresponding to almost exactly 2 orbital periods. The profiles are nearly identical, except for a large difference in flux at the expected velocty of the G8 III star. We will discuss the relative emission from each star and the roles of collisional excitation and photoionization/recombination in producing the 1640 Angstroms emission from each star. This work is supported by grant GO-05886.01.94A to the University of Colorado.
Linsky Jeffrey L.
Wood Brian E.
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