SUMMARY OF PROPOSAL 81351
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
3-1-1 YOSHINODAI
SAGAMIHARA
KANAGAWA JAPAN 229-8510
Tel: 042-759-8136 Fax: 042-759-8455
Medium: CD ROM
Subject: CATACLYSMIC VARIABLES
Continual Observations of an Outburst of SS Cygni
ABSTRACT
SS Cygni is one of the most well-observed dwarf novae, displaying optical outburst every 30-60 days. In SS Cyg, the masses of both the white dwarf and the secondary star are measured precisely, and the relation between the mass accretion rate and the visual magnitude (mV) is calibrated with the accuracy of 20 percent.
By comparing mV and the X-ray luminosity, we attempt to measure the critical mass accretion rate which discriminate the optically thin and thick accretion disc. The critical mass accretion rate for a binary whose system parameters are well known like SS Cyg will pose a significant constraint on the theory of the accretion disc such as ADAF or so.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| PUTRA MAHASENA | ISAS | JAPAN |
| HAJIME INOUE | ISAS | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)SS_CYGNI | A | 325.6671 | 43.5861 | 200 ks | N | N | P | 1.0 | 10 |