SUMMARY OF PROPOSAL 62023
UNIVERSITY OF HAWAII
2680 WOODLAWN DRIVE
HONOLULU
HI USA 96822
Tel: 808-956-6317 Fax: 808-988-2790
Medium: CD ROM
Subject: STARS
DK UMA, A STAR ON THE ASCENT
ABSTRACT
The G4 III-IV yellow giant star, 24 DK UMa, is a rare example of a post-Hertzsprung Gap star, which is now poised to start its first ascent of the red giant branch. It occupies a strategic location in the H-R diagram, at the end point of a rapid spindown and decline in dynamo activity, and just prior to the onset of deep convective mixing. We propose to obtain a 40 ks ASCA spectrum, which we will analyze jointly with our existing near UV and EUV spectra to infer the distribution of chromospheric and coronal material as a function of altitude and temperature. A comparison will be made with stars of the same mass but at different phases of post main sequence evolution in order to study changes in dynamo activity.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| STEPHEN DRAKE | NASA/GSFC | USA |
| THOMAS R. AYRES | UNIV. OF COLORADO | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)HD 82210 | 2 | 143.6200 | 69.8303 | 40 ks | N | Y | P | 0.80000 | 1 |