Confirmation of 1RXS J165443.5-191620 as an intermediate polar and its orbital and spin periods

Details Confirmation of 1RXS J165443.5-191620 as an intermediate polar and its orbital and spin periods Confirmation of 1RXS J165443.5-191620 as an intermediate polar and its orbital and spin periods

2010-12-08

arxiv.org/abs/1012.1867v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

7 pages, 9 figures, 6 tables, accepted for publication in A&A

Scientific paper

Aims: We investigate the physical nature of the X-ray emitting source 1RXS J165443.5-191620 through optical photometry and time-resolved spectroscopy. Methods: Optical photometry is obtained from a variety of telescopes all over the world spanning about 27 days. Additionally, time-resolved spectroscopy is obtained from the MDM observatory. Results: The optical photometry clearly displays modulations consistent with those observed in magnetic cataclysmic variables: a low-frequency signal interpreted as the orbital period, a high-frequency signal interpreted as the white dwarf spin period, and an orbital sideband modulation. Our findings and interpretations are further confirmed through optical, time-resolved, spectroscopy that displays H-alpha radial velocity shifts modulated on the binary orbital period. Conclusion: We confirm the true nature of 1RXS J165443.5-191620 as an intermediate polar with a spin period of 546 seconds and an orbital period of 3.7 hours. In particular, 1RXS J165443.5-191620 is part of a growing subset of intermediate polars, all displaying hard X-ray emission above 15keV, white dwarf spin periods below 30 minutes, and spin-to-orbital ratios below 0.1.

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