SUMMARY OF PROPOSAL 63013

DR. SERGIO CAMPANA
CAMPANA@MERATE.MI.ASTRO.IT

OSSERVATORIO ASTRONOMICO DI BRERA-MILANO
VIA E. BIANCHI 46
MERATE (LC)
ITALY I-22055
Tel: +39-39-99911 27 Fax: +39-39-99911 60
Medium: 2GBDAT
Subject: X-RAY BINARIES

ASCA FOLLOW-UP OF A NEW X-RAY PULSATOR


ABSTRACT

We have recently discovered a 12 min periodic signal in the X-ray flux emitted by 1WGA J1958+3232, an X-ray source near the Galactic plane. These pulsations likely arise from the rotation of an accreting magnetic compact star, either a white dwarf in an intermediate polar cataclysmic variable, or a neutron star in an X-ray binary. The source is located in a very crowded region and more than 15 stars with V<19 are contained within the 30" radius X-ray error circle. We propose here a 25 ks ASCA observation aimed at: (a) confirming the X-ray flux level of the source and its 12 min periodicity, and (b) study for the first time, the spectrum continuum above 2 keV.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
GIAN LUCA ISRAELOA-ROMAITALY
LUIGI STELLAOA-ROMAITALY
LORELLA ANGELININASA-GSFCUSA
NICHOLAUS WHITENASA-GSFCUSA
PAOLO GIOMMISAX-SDCITALY

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)1WGA J1958+3232
2
299.5575 32.5496 25 ksN
N
P
0.07000
1

TARGET 1

THE OBSERVATION SHOULD BE THE MORE THE POSSIBLE CONTINUOUS.