Applied Mathematics and Nonlinear Sciences
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Journal

Applied Mathematics and Nonlinear Sciences


Volume & Issue

Volume 2, Issue 1


Published on

May 23, 2017


Pages

181-194


DOI

10.21042/AMNS.2017.1.00015
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Article

Photometric and Spectroscopic Studies of the Intermediate -Polar Cataclysmic System DQ Her

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Authors

I. Zead Affiliation:
National Research Institute of Astronomy and Geophysics (NRIAG) Department of Astronomy, Stellar Lab., Helwan 11421, Cairo, Egypt , M. Saad Affiliation:
National Research Institute of Astronomy and Geophysics (NRIAG) Department of Astronomy, Stellar Lab., Helwan 11421, Cairo, Egypt , M. R. Sanad Affiliation:
National Research Institute of Astronomy and Geophysics (NRIAG) Department of Astronomy, Stellar Lab., Helwan 11421, Cairo, Egypt , M. M. Behary Affiliation:
Department of Astronomy, Faculty of Sciences, El Azhar University, Cairo, Egypt , K. Gadallah Affiliation:
Department of Astronomy, Faculty of Sciences, El Azhar University, Cairo, Egypt and A. Shokry Affiliation:
National Research Institute of Astronomy and Geophysics (NRIAG) Department of Astronomy, Stellar Lab., Helwan 11421, Cairo, Egypt


Abstract

We report the results of spectral and photometric observations of DQ Her. Available spectra from International Ultraviolet Explorer (IUE), Hubble Space Telescope Faint Object Spectrograph (HST - FOS) and CCD photometry of one night were used. Some profiles revealing the variations of some spectral lines at different times are presented. There is variation with time for photometric observations and the brightness of DQ Her is changed from 14 mag. to 17.7 mag with clear display of burst. The ultraviolet luminosity for emitting region is in the range of (1.9x1031 erg s−1). The mass accretion rate is in the range of (3.5x10−12M⊙yr−1). The line flux modulations at different times can be explained in terms of the accretion curtain model for intermediate polars, Kim & Beuermann (1996).


Keywords

Photometric, spectroscopic studies, polar cataclysmic system, celestial dynamics, 37N05, 70F15


Citation

Zead, I., Saad, M., Sanad, M. R., Behary, M. M., Gadallah, K., & Shokry, A. (2017). Photometric and spectroscopic studies of the intermediate -polar cataclysmic system DQ her. Applied Mathematics and Nonlinear Sciences, 2(1), 181–194. https://doi.org/10.21042/AMNS.2017.1.00015
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