In this thesis, X-ray observations of four accretion powered
pulsars are presented. Using RXTE
observations of 4U 1907+09, we found three new pulse periods of the source. We
found that the source spun-down almost at a constant rate of
$dot nu$ = (-3.54 $pm 0.02) times 10^{-14}$ Hz s$^{-1}$ for more than
15 years. Using RXTE
observations, X-ray flux
related spectral and timing features in 2S 1417-62 were, in general,
interpreted as a sign of a disc accretion with
a similar geometry with a varying mass accretion rate,
whereas spectral and timing features of the low X-ray flux regions were
interpreted as a sign of possible temporary accretion geometry change prior
to the next periastron. Using XMM-Newton and RXTE observations of SAX
J2103.5+4545, we discovered quasi periodic oscillations around 0.044 Hz
(22.7 sec) while the source was spinning-up with a rate of
$(7.4pm0.9)times10^{-13}$Hz s$^{-1}$. In the X-ray
spectrum, we also found a soft component consistent with a
blackbody emission with ${rm{kT}}sim1.9$keV. Using RXTE observations, we also
studied spectral evolution of Her X-1
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605552/index.pdf |
| Date | 01 November 2004 |
| Creators | Inam, Sitki Cagdas |
| Contributors | Baykal, Altan |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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