CXOGBS J174954.5-294335: A New Deeply-Eclipsing Intermediate Polar

Abstract

We present the results of a photometric and spectroscopic analysis of the Galactic Bulge Survey X-ray source CXOGBS J174954.5-294335 (hereafter, referred to as CX19). CX19 is a long period, eclipsing intermediate polar type cataclysmic variable with broad, single-peaked Balmer and Paschen emission lines along with HeII $\lambda 4686$ and Bowen blend emission features. With coverage of one full and two partial eclipses and archival photometry, we determine the ephemeris for CX19 to be HJD(eclipse) = 2455691.8581(5) + 0.358704(2)$\times$N. We also recovered the white dwarf spin period of P${}_{\mathrm{spin}}$ = 503.32(3) seconds which gives a P${}_{\mathrm{spin}}$/P${}_{\mathrm{orb}}$ = 0.016(6), comparable to several confirmed, long period intermediate polars. CX19 also shows a clear X-ray eclipse in the 0.3-8.0 keV range observed with Chandra. Two optical outbursts were observed lasting between 6-8 hours (lower limits) reaching $\sim$1.3 mags in amplitude. The outbursts, both in duration and magnitude, the accretion disc dominated spectra and hard X-ray emission are reminiscent of the intermediate polar V1223 Sgr sharing many of the same characteristics. If we assume a main sequence companion, we estimate the donor to be an early G-type star and find a minimum distance of $d\approx$ 2.1 kpc and a 0.5-10.0 keV X-ray luminosity upper limit of 2.0 $\times$ 10${}^{33}$ erg s${}^{-1}$. Such an X-ray luminosity is consistent with a white dwarf accretor in a magnetic cataclysmic variable system. To date, CX19 is only the second deeply-eclipsing intermediate polar with X-ray eclipses and the first which is optically accessible.

Accepted for publication in MNRAS, 25 pages, 15 figures, 1 table

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• INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
• Magnetically-gated accretion model: application to short bursts in the intermediate polar V1223 Sgr
• Discovery of periodicities in two highly variable intermediate polars towards the Galactic Center
• Periodicity from X-ray sources within the inner Galactic disk
• Dynamical Modeling of CXOGBS J175553.2-281633: A 10 Hour Long Orbital Period Cataclysmic Variable
• New transient Galactic bulge intermediate polar candidate XMMU J175035.2-293557
• Nature of 4FGL J1838.2+3223: a flaring `spider' pulsar candidate
• Constraining the nature of the accreting binary in CXOGBS J174623.5-310550
• Measuring the precise photometric period of the intermediate polar 1RXS J230645.0+550816 (1SWXRT J230642.7+550817) based on extensive photometry
• Searching for outliers in the Chandra Source Catalog