Ab Doradus: the Key Object of Stellar Activity

Details Ab Doradus: the Key Object of Stellar Activity Ab Doradus: the Key Object of Stellar Activity

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5310v&link_type=abstract

HST Proposal ID #5310

Mathematics

Probability

Hst Proposal Id #5310 Cool Stars, Stellar A

Scientific paper

AB Doradus (K2IV) is the best target to study stellar activity at highlevels. It has many important properties to have a high priority forST UV-observations: 1.) It is bright (V=6.9) and its chromospheric-transitionregion line fluxes are among the highest ones and easily accessible forGHRS-observations. 2.) Its activity at different wavelengths can bemodelled by a rather stable geometry (see Fig.3) which is very suitablefor Doppler-imaging and interpretation. 3.) The rotation period is short(12 hours) permitting significant results in a reasonable observation time.4.) With a high probability major UV-X ray flares take place during onerotation cycle. High resolution observations of TR region lines duringthe flares are physically crucial. 5.) Co-rotating transients at severalstellar radii, carrying out angular momentum from the star, can be observedin 12 hours. 5.) AB Doradus (Delta = -65 deg) lies in the continuos viewingzone. This is valuable if 12 hours of spacecraft time will be allocated.Then no flares nor transients will be lost.We propose that AB Doradus will be observed continuosly during 12 hours oftotal spacecraft time with the G160M grating. Its resolving power (20000)is ideal for the star's rotational velocity (100 km/s). The region aroundCIV 1550 will be observed with 3 min time resolution. This is optimal forflares and transients, for the Doppler-imaging spectra will be co-added.

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