In this work, the CHANDRA ACIS-S3 data of the old classical nova RR
Pic (1925) is presented. The source is detected with a count rate of 0.067 (+-0.002)
c/s in the 0.3-5.0 keV energy range. The orbital period of the binary system in
X-ray wavelengths is detected. X-ray spectrum of RR Pic can be represented
by a composite model of bremsstrahlung with a photoelectric absorption, two
absorption lines centered around 1.1-1.4 keV and 5 Gaussian emission lines centered
at around 0.3-1.1 keV . The best t bremsstrahlung temperature derived
from the model ranges from 0.99 to 1.60 keV and the unabsorbed X-ray flux is found to be 2.51 (+0.39
-1.21) erg/cm2/s in the 0.3-5.0 keV range.The absorption
lines correspond to several transitions of Fe, Ne and Na. The emission lines
correspond to various transitions of S, N, O, C, Ne and Fe / and observations
with better spectral resolution are needed to determine the exact transitions.
The source spectrum is better explained with photoionized plasma model rather
than the cooling flow model. It has also been found that the neutral Hydrogen
column density differs for orbital minimum and orbital maximum spectra with values 0.25 (+0.23
-0:18)*10^22 atoms/cm2 and 0.64 (+0.13
-0.14)*10^22 atoms/cm2 respectively at
3 sigma confidence level. The difference of neutral Hydrogen column density between
the maximum and minimum phase spectra indicates existence of a warm
absorbing region on the disc at the location of the impact zone.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12608716/index.pdf |
| Date | 01 September 2007 |
| Creators | Pekon, Yakup |
| Contributors | Balman, Solen |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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