Doppler Imaging HR1099: Density and Temperature Structure of a Prototype RS CVN System CYC3-MEDIUM

Details Doppler Imaging HR1099: Density and Temperature Structure of a Prototype RS CVN System CYC3-MEDIUM Doppler Imaging HR1099: Density and Temperature Structure of a Prototype RS CVN System CYC3-MEDIUM

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4447d&link_type=abstract

HST Proposal ID #4447

Computer Science

Hst Proposal Id #4447

Scientific paper

Although the Sun is a very slowly-rotating inactive star, images made in high temperature UV emission lines reveal bright plage regions located above dark sunspots. This indicates that magnetic fields control the local heating rate, density and energy balances even for a star with a weak field. Do rapidly-rotating active stars show the same pattern? We will test this hypothesis by using the GHRS to Doppler image one of the brightest of the active RS CVn systems. Analysis of a sequence of ECH-B spectra obtained at 8 different orbital phases for the the HR 1099 (V711 Tau) system will yield images with about 30 resolution elements across the surface of the K1 IV star. A UNIQUE aspect of our program will be obtaining images in the CIII] 1909A and SiIII] 1892A intersystem lines to study the electron density and the amount of 30,000 to 60,000 K material in the plage transition regions. These will be the first Doppler images ever made with the following characteristics: (1) the lines are density-sensitive, (2) the lines are formed in the high-temperature plasma above the chromosphere, and (3) the images will have far higher spatial resolution than before due to the ECH-B spectral resolution of 43,000 (7 km/s). We will also obtain images in the Mg II h and k and C IV 1548, 1550A lines to study the size and location of plages in the chromosphere and transition region. Concurrent EUVE, GTO and ground-based optical studies will complete the picture of a solar-like star from the photosphere to the transition region.

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