IPHAS J062746.41+014811.3: A DEEPLY ECLIPSING INTERMEDIATE POLAR

Journal Article · Sat Oct 20 04:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/758/2/79· OSTI ID:22086555

Aungwerojwit, A ^[1]; Gaensicke, B T; Wheatley, P J; Pyrzas, S ^[2]; Staels, B ^[3]; Krajci, T ^[4]; Rodriguez-Gil, P ^[5]

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1. Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000 (Thailand)
2. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
3. Instituto de Astronomia, Universidad Catolica del Norte, Avenida Angamos 0610, Casilla 1280, Antofagasta (Chile)
4. CBA Flanders, Alan Guth Observatory, Koningshofbaan 51, B-9308 Hofstade, Aalst (Belgium)
5. Astrokolkhoz Observatory, PO Box 1351 Cloudcroft, NM 88317 (United States)

We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric H{alpha} Survey of the northern galactic plane, IPHAS J062746.41+014811.3, and classify the system as the fourth deeply eclipsing intermediate polar known with an orbital period of P {sub orb} = 8.16 hr and a spin period of P {sub spin} = 2210 s. The system shows mild variations of its brightness that appear to be accompanied by a change in the amplitude of the spin modulation at optical wavelengths and a change in the morphology of the eclipse profile. The inferred magnetic moment of the white dwarf is {mu}{sub wd} {approx} (6-7) Multiplication-Sign 10{sup 33} G cm{sup 3}, and in this case IPHAS J062746.41+014811.3 will evolve either into a short-period EX Hya-like intermediate polar with a large P {sub spin}/P{sub orb} ratio or, perhaps more likely, into a synchronized polar. Swift observations show that the system is an ultraviolet and X-ray source, with a hard X-ray spectrum that is consistent with those seen in other intermediate polars. The ultraviolet light curve shows orbital modulation and an eclipse, while the low signal-to-noise ratio X-ray light curve does not show a significant modulation on the spin period. The measured X-ray flux is about an order of magnitude lower than would be expected from scaling by the optical fluxes of well-known X-ray-selected intermediate polars.

• OSTI ID: 22086555
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 758; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTRONOMY
ASTROPHYSICS
BRIGHTNESS
COSMIC X-RAY SOURCES
DIAGRAMS
ECLIPSE
HARD X RADIATION
MAGNETIC MOMENTS
MODULATION
NOVAE
PHOTOMETRY
SIGNAL-TO-NOISE RATIO
SPIN
TELESCOPES
TIME RESOLUTION
ULTRAVIOLET RADIATION
VISIBLE RADIATION
WHITE DWARF STARS