Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..171h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. 171-180
Astronomy and Astrophysics
Astronomy
49
Cataclysmic Variables, Sky Surveys (Astronomy), White Dwarf Stars, X Ray Binaries, X Ray Spectra, Emission Spectra, Exosat Satellite, Rosat Mission, Stellar Magnitude, Visible Spectrum
Scientific paper
We report the discovery of a new intermediate polar, detected during the ROSAT all-sky survey. In the course of an optical identification program for galactic plane sources with absolute value of b less then 20 deg a V = 14.6 mag cataclysmic variable was found as optical counterpart of a soft ROSAT source. A follow-up pointed observation revealed a modulation in the soft X-ray flux with a pulse period of 272.74 s indicating the spin period of the white dwarf. The modulation depth increase with decreasing energy and pulse phase resolved spectroscopy shows the X-ray spectrum consists of a variable blackbody component with kT around 57 eV and a weak hard tail. The variations in the blackbody component are consistent with changes in the normalization only, suggesting geometric effects as origin. Optical follow-up spectroscopy revealed a binary period of 4.15 hours.
Haberl Franck
Motch Ch.
Pakull Manfred
Pietsch Wolfgang
Schwarzenberg-Czerny Aleksander
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