SUMMARY OF PROPOSAL 73003
INSTITUT FUER THEORETISCHE PHYSIK UND ASTROPHYSIK
OLSHAUSENSTRASSE 40
KIEL
SCHLESWIG-HOLSTEIN GERMANY 24118
Tel: +49-431-8804106 Fax: +49-431-8804100
Medium: 2GB8MM
Subject: STARS
X-RAY VARIABLILITY AT THE ONSET OF CONVECTION
ABSTRACT
We propose to observe the F-type supergiant Canopus in order to continue a series of previous observations with various X-ray observatories. We hope to clarify the question whether the X-ray emision is variable or not, which would be a crucial point for unveiling the X-ray emitting mechanism (coronae or stellar winds) of such stars at the onset of outer convection zones. Additional observations of the gap-stars Capella and 24 UMa should reveal evidence for (non-)variablility of these stars, of which their X-ray properties show some similarities to the F-type supergiants, especially concerning the range of X-ray luminosity and variability.
CO-INVESTIGATORS
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)CANOPUS | C | 95.9883 | -52.6956 | 20 ks | N | Y | P | 0.19000 | 1 |
| 2)CAPELLA | C | 79.1721 | 45.9981 | 20 ks | N | Y | P | 3.90000 | 1 |
| 3)24 UMA | C | 143.6200 | 69.8303 | 20 ks | N | Y | P | 0.58000 | 1 |