SUMMARY OF PROPOSAL 63013
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 ISRAEL | OA-ROMA | ITALY |
| LUIGI STELLA | OA-ROMA | ITALY |
| LORELLA ANGELINI | NASA-GSFC | USA |
| NICHOLAUS WHITE | NASA-GSFC | USA |
| PAOLO GIOMMI | SAX-SDC | ITALY |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)1WGA J1958+3232 | 2 | 299.5575 | 32.5496 | 25 ks | N | N | P | 0.07000 | 1 |
TARGET 1
THE OBSERVATION SHOULD BE THE MORE THE POSSIBLE CONTINUOUS.