Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5214n&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #52.14; Bulletin of the American Astronomical Society, Vol. 31, p.904
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present analysis of 10 kilosecond ASCA observation of type I X-ray burster 4U1728-34 while it was in the low hard state. The source luminosity in the 0.5-10 keV band was 1*E(37) ergs s(-1) at an assumed distance of 4.3 kpc. The ASCA spectrum is best fit by combined power-law and a soft thermal components. The thermal component can be either a kT=0.4 keV, R=18 km blackbody or a Rsqrt {costheta }=11.3 km multi-color disk blackbody. No emission lines were detected. The column density to the source was well constrained at 3.20+/-0.05*E(22) cm(-2) . One moderate sized X-ray burst was also observed in the course of our pointing. Once the persistent emission was subtracted, the burst spectrum can be fit by a blackbody model. We analyzed the time dependent change in the spectrum and found no evidence of photospheric expansion, however the blackbody radius increased asymptotically to 7.5 km as the flux and temperature decreased. If the neutron star radius is interpreted to be 7.5 km, the soft thermal component seen in the persistent emission is likely due to the disk.
Barret Dider
Grindlay Jonathon E.
Narita Taku
No associations
LandOfFree
ASCA Observation of LMXB 4U 1728-34 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ASCA Observation of LMXB 4U 1728-34, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ASCA Observation of LMXB 4U 1728-34 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1120602