Doppler Imaging of the Chromospheres and Transition Regions of Cool Stars: AB Doradus, Cycle 4

Details Doppler Imaging of the Chromospheres and Transition Regions of Cool Stars: AB Doradus, Cycle 4 Doppler Imaging of the Chromospheres and Transition Regions of Cool Stars: AB Doradus, Cycle 4

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5181w&link_type=abstract

HST Proposal ID #5181

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #5181 Stellar Astrophysics Cool Stars

Scientific paper

AB Dor (HD 36705) is one the most active single early K dwarfs known. It is very rapidly-rotating with a period of 0.514 days and vsini=100 km/s. It has been suggested that AB Dor is still contracting to the main sequence, on the basis of a strong Li I absorption line and Pleiades space motions. The phenomena exhibited by this star include flares, a large starspot, saturated emission line fluxes, bright nonthermal radio emission, and a co-rotating disk (or ring) located at two stellar radii that is identified from H-alpha emission. We propose to monitor AB Dor, which is in the continuous viewing zone, continuously for one rotation period to produce Doppler images of the lower chromosphere and the transition region in the light of Mg II, C IV, Si IV, O IV, C II, N V, Si III], and C III], with phase resolution of 0.05 at Mg II and 0.08 in the transition region. We will use these data to produce a 3-D model of the outer atmosphere of this star, using the density-sensitive line ratios and the measured emission line fluxes to infer the total nonradiative heating rate. We will obtain coordinated x-ray, radio, and optical observations.

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