SUMMARY OF PROPOSAL 71035

DR. TADAYASU DOTANI
DOTANI@astro.isas.jaxa.jp

INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
YOSHINODAI 3-1-1
SAGAMIHARA
KANAGAWA JAPAN 229-8510
Tel: 0427-59-8151 Fax: 0427-59-8455
Medium: 2.5GB8MM
Subject: X-RAY BINARIES

ACCRETION-POWERED MILLISECOND PULSAR SAX J1808.4-3658 IN QUIESCENCE


ABSTRACT

Characteristics of the accretion flow at very low accretion rate is poorly understood yet. It is often considered that advection dominated accretion flow (ADAF) is realized as indicated by the observation of black hole transients in quiescence. However, low level X-ray emission from neutron star transients in quiescence seems to contradict to the idea of ADAF. We propose an observation of SAX J1808.4-3658, which is the only accretion-powered millisecond pulsar (P=2.49 msec). Observation of the pulsation in quiescence enables us to probe the accretion flow at very low accretion rate.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
KAZUMI ASAIKANAGAWA UNIVERSITYJAPAN
MASAHIRO KAWASAKIISASJAPAN

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)SAX J1808.4-3658
B
272.1208-36.9767
80 ks
N
Y
P
0.03000
1