Phase-resolved Simultaneous ORFEUS Far-Ultraviolet and ROSAT X-Ray Observations of the Active Star AB Doradus

Details Phase-resolved Simultaneous ORFEUS Far-Ultraviolet and ROSAT X-Ray Observations of the Active Star AB Doradus Phase-resolved Simultaneous ORFEUS Far-Ultraviolet and ROSAT X-Ray Observations of the Active Star AB Doradus

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500l..25s&link_type=abstract

Astrophysical Journal Letters v.500, p.L25

Astronomy and Astrophysics

Astronomy

17

Stars: Activity, Stars: Coronae, Stars: Late-Type, Stars: Pre-Main-Sequence

Scientific paper

We report phase-resolved simultaneous ORFEUS far-ultraviolet (FUV) and ROSAT soft X-ray observations of the rapidly rotating young star AB Doradus (HD 36705), obtained with the FUV spectrometer flown on board ORFEUS II and the High Resolution Imager (HRI) on board ROSAT. The lines of C III at 977 and 1176 A , O V at 1218 A, and O VI at 1032 and 1038 A, as well as N II at 1085 A and Si III at 1206 A, are clearly detected in the ORFEUS spectra. The X-ray flux intrinsically varied during the observation and FUV and X-ray fluxes are found to correlate. No changes in the line profiles are detectable, but the line profiles of C III lambda 977 and O VI lambda 1032 are definitely broadened with respect to the instrumental line profile. The observed broadening does not exceed the photospheric v sin i value, suggesting that the observed C III and O VI emission, formed at a characteristic temperature of ~80,000-300,000 K, is produced close to the star's surface. The C III lambda 1176/ lambda 977 line ratio is found to be larger than that in the Sun, indicating electron densities (at ~80,000 K) of ne ~ 1011 cm ^{-3} or higher.

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