Optical observations of Be/X-ray transient system KS 1947+300

ROTSE-IIId observations of the Be/X-ray transient system KS 1947+300 obtained between September 2004 and December 2005 make it possible to study the correlation between optical and X-ray activity. The optical outburst of 0.1 mag was accompanied by an increase in X-ray flux in 2004 observations. Strong correlation between the optical and X-ray light curves suggests that neutron star directly accretes from the outflowing material of Be star. The nearly zero time lag between X-ray and optical light curves suggests a heating of the disk of Be star by X-rays. No optical brightening and X-ray enhancement was seen in 2005 observations. There is no indication of the orbital modulation in the optical light curve

The Spectrum and Dips of RE 0751+14: A joint evaluation of ROSAT and ASCA Archival Data

Using archival ASCA and ROSAT observations of RE 0751+14, X-ray energy spectra, pulse profiles and the results of pulse timing analysis are presented. The energy spectra are well-fitted by a blackbody model at low energy and a Raymond-Smith model at high energy, together with a partial covering absorber. A fluorescence emission line at 6.4 keV with an equivalent width $\sim 220$ eV was resolved for the first time.Comment: To appear on Astrophysics and Space Science, vol 259, pages 191-203, January 199

The Relationship between Organisational Culture and Job Satisfaction in Higher Education Institutions: The Bishkek Case

Organisational culture and job satisfaction are crucial insofar as human resources are the most valuable resources organisations have in today's business world. Organisational culture encompasses the characteristics that unite and integrate employees of an organisation and distinguish them from employees of other institutions. An employee who has high job satisfaction is an employee who enjoys his/her job and is satisfied with the conditions provided by the organisation. By doing the best that they can do, employees with high job satisfaction ensure that the institution has a competitive advantage and, as a result, extends its life. In this study, questions about organisational culture, levels of job satisfaction and factors influencing them were examined in higher education institutions in Bishkek, Kyrgyzstan. Determining the relationship between organisational culture and job satisfaction in higher education institutions was also one of the objectives of this study. In this study, factors influencing organisational culture and job satisfaction in the case of higher education institutions in the service sector were investigated. In line with the research objective, a questionnaire was conducted in order to be able to explain the factors influencing organisational culture and job satisfaction of university employees and describe the relationship that exists, if any, between organisational culture and job satisfaction. Results showed that there is a significant linear and positive correlation between organisational culture and job satisfaction at a level of 47.2 %, which corresponded to a medium strength. In this case, an improvement in organisational culture will cause an increase in job satisfaction

ROSAT Observations of the Vela Pulsar

The ROSAT HRI was used to monitor X-ray emission from the Vela Pulsar. Six observations span 2-1/2 years and 3 glitches. The summed data yield a determination of the pulse shape, and X-ray emission from the pulsar is found to be 12 % pulsed with one broad and two narrow peaks. One observation occurred 15 days after a large glitch. No change in pulse structure was observed and any change in X-ray luminosity, if present, was less than 3 %. Implications for neutron star structure are discussed.Comment: To be publisned in the Astrophysical Journa

AB Dor: A Single Star with RSCVn Like Activity in X-ray Band

Using the archival ROSAT PSPC observations, AB Dor is found to be variable in X-rays. The periodic variations are consistent with previously reported rotational period of 0.514 days. The average spectrum of AB Dor is best represented with two-temperature Raymond-Smith model with kT values of 0.19+/-0.07 and 1.17+/-0.02 keV. The quiescent luminosity of the system is found to be 4.36+/-0.6 10^30 ergs/s. A flare with a rise time of about 350 seconds is detected during which X-ray luminosity rises from 5.8+/-1.6 10^30 to 15.8+/-4.9 10^30 ergs/s. We conclude that AB Dor is very similar to the active components of RS CVn binaries and other active classes. In view of the wide separation from the binary companion Rst 137B, this activity must be intrinsic to the active star.Comment: 11 pages in PostScript including figures, accepted for publication in Astrophysics and Space Science, available at http://astroa.physics.metu.edu.tr/preprints.htm