Discovery of 101-s pulsations from AX J0057.4-7325 in the SMC with ASCA

Authors
Yokogawa, J Torii, K Kohmura, T Imanishi, K Koyama, K
Citation
J. Yokogawa et al., Discovery of 101-s pulsations from AX J0057.4-7325 in the SMC with ASCA, PUB AST S J, 52(6), 2000, pp. L53-L56
Citations number
22
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN journal
00046264 → ACNP
Volume
52
Issue
6
Year of publication
2000
Pages
L53 - L56
Database
ISI
SICI code
0004-6264(2000)52:6<L53:DO1PFA>2.0.ZU;2-0
Abstract
The results from two ASCA observations of AX J0057.4-7325 = RX J0057.3-7325 are presented. Coherent pulsations with a barycentric period of 101.45 +/- 0.07 s were discovered in the second observation. The X-ray spectrum was f ound to be hard (photon index similar to 0.9) and unchanged through these o bservations, except for the flux. The ROSAT archival data show that AX J005 7.4-7325 exhibits a flux variation with a factor greater than or similar to 10. A discussion on a possible optical counterpart is given.