Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.2511d&link_type=abstract
American Astronomical Society, 190th AAS Meeting, #25.11; Bulletin of the American Astronomical Society, Vol. 29, p.808
Astronomy and Astrophysics
Astronomy
Scientific paper
Far ultraviolet spectra (lambda lambda 910--1216) of cool stars were obtained by the Berkeley spectrograph aboard the ORFEUS telescope under NASA's Guest Investigator program carried out during a 14-day ORFEUS-SPAS II mission in November/December 1996. Target stars included the single stars: beta Dra (HD 6536, G2Ib-IIa), alpha TrA (HD 150798, K2IIb-IIIa), alpha Aqr (HD 209750, G2Ib), and the binary systems: UX Ari (HD 21242, G5V/K0IV), HR 1099 (HD 22468, G5IV/KIIV), and 44iota Boo (HD 133640, G2V/G2V). The short period W UMa-type binary 44iota Boo was observed at two orbital phases. The spectral resolution ( ~ 90 km\ s(-1) ) is sufficient to resolve emission from the two components of this system. Emission from chromospheric species of C III (lambda 977, lambda 1176), O VI (lambda 1032, lambda 1038), and Si III (lambda 1206) is present in all of the stars. Emission at H Ly-beta (lambda 1025) is most likely produced both by the target star and the geocorona. Acquisition of a simultaneous spectrum of the nearby sky facilitates extraction of the stellar flux. Electron densities in the lower transition regions can be inferred from ratios of the C III transitions; the size of emitting regions can be estimated from the emission measure distribution. Models of the atmospheres will be presented in conjunction with coronal models.
Brickhouse Nancy S.
Dupree Andrea K.
Hurwitz Margaret M.
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