High-speed, energy-resolved STJ observations  of the AM Her
system V2301 Oph

Reynolds, A. P.; Ramsay, Gavin; Bruijne, J. H. J. de; Perryman, M. A. C.; Cropper, Mark; Bridge, Chris; Peacock, A.

doi:10.1051/0004-6361:20035850

Cited by 11 publications

(13 citation statements)

References 13 publications

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“…The primary aim is to resolve the eclipse ingress/egresses of the accretion region(s). Similar work on other eclipsing polars using a Superconducting Tunnel Junction detector has been described by Perryman et al (2001), Bridge et al (2002) and Reynolds et al (2005). There is also discussion on unpublished results obtained by ULTRACAM and OPTIMA in Schwope et al (2004).…”

Section: Eclipsing Am Her Stars (Or Polars)supporting

confidence: 58%

First science with the Southern African Large Telescope: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2

O’Donoghue

Buckley

Balona

et al. 2006

Monthly Notices of the Royal Astronomical Society

171

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We describe briefly the properties of the recently completed Southern African Large Telescope (SALT), along with its first light imager SALTICAM. Using this instrument, we present 4.3 h of high‐speed unfiltered photometric observations of the eclipsing polar SDSS J015543.40+002807.2 with time‐resolution as short as 112 ms, the highest‐quality observations of this kind of any polar to date. The system was observed during its high‐luminosity state. Two accreting poles are clearly seen in the eclipse light curve. The binary system parameters have been constrained: the white dwarf mass is at the low end of the range expected for cataclysmic variables. Correlations between the positions of the accretion regions on or near the surface of the white dwarf and the binary system parameters were established. The sizes of the accretion regions and their relative movement from eclipse to eclipse were estimated: they are typically 4°–7° depending on the mass of the white dwarf. The potential of these observations will only fully be realized when low‐state data of the same kind are obtained and the contact phases of the eclipse of the white dwarf are measured.

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Section: Eclipsing Am Her Stars (Or Polars)supporting

confidence: 58%

First science with the Southern African Large Telescope: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2

O’Donoghue

Buckley

Balona

et al. 2006

Monthly Notices of the Royal Astronomical Society

171

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“… References: (1) Silber et al (1994), (2) Barwig et al (1994), (3) Šimić et al (1998), (4) Steiman‐Cameron & Imamura (1999), (5) Reynolds et al (2005) and (6) this paper. …”

Section: The Light Curvesmentioning

confidence: 97%

“…In the optical band, a bright accretion stream is evident and there is a significant cycle‐to‐cycle variation in its eclipse profile. Reynolds et al (2005) suggest that this variation is due to a change in the amount of material in the threading region, the point at which the accretion stream feels the force of the magnetic field of the white dwarf.…”

Section: Introductionmentioning

confidence: 99%

XMM-Newton observations of the eclipsing polar V2301 Oph

Ramsay

Cropper

2007

Monthly Notices of the Royal Astronomical Society

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We present XMM-Newton observations of the eclipsing polar V2301 Oph which cover nearly 2.5 binary orbital cycles and 2 eclipses. This polar is believed to have the lowest magnetic field strength (7 MG) of any known polar. We find evidence for structure in the X-ray eclipse profile which shows a `standstill' feature lasting 26+/-4 sec. This allows us to place an upper limit on the mass of the white dwarf of ~1.2 Msun. We find no evidence for QPOs in the frequency range 0.02-10 Hz. This coupled with the absence of QPOs in RXTE data suggest that, if present, any oscillations in the shock front have a minimal effect on the resultant X-ray flux. We find no evidence for a distinct soft X-ray component in its spectrum - it therefore joins another 7 systems which do not show this component. We suggest that those systems which are asynchronous, have low mass transfer rates, or have accretion occurring over a relatively large fraction of the white dwarf are more likely to show this effect. We find that the specific mass transfer rate has to be close to 0.1 g cm^-2 s^-1 to predict masses which are consistent with that derived from our eclipse analysis. This maybe due to the fact that the low magnetic field strength allows accretion to take place along a wide range of azimuth.Comment: Accepted MNRA

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“…While the extremely interesting X-ray astronomy [2] delivered with X-ray MKIDs is only available with a space-based telescope, optical/UV detectors provide exciting science opportunities from the ground and from space [6,9,10].…”

Section: Optical/uv Detectorsmentioning

confidence: 99%

Optical/UV and X-Ray Microwave Kinetic Inductance Strip Detectors

et al. 2008

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Microwave Kinetic Inductance Detectors (MKIDs) are superconducting detectors that sense the change in the surface impedance of a thin superconducting film when Cooper Pairs are broken by using a high quality factor resonant circuit. We are developing strip detectors that have aluminum MKID sensors on both ends of a rectangular tantalum strip. These devices can provide one dimensional spatial imaging with high quantum efficiency, energy resolution, and microsecond time resolution for single photons from the IR to the X-ray. We have demonstrated X-ray strip detectors with an energy resolution of 62 eV at 6 keV, and hope to improve this substantially. We will also report on our progress towards optical arrays for a planned camera for the Palomar 200 telescope.

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High-speed, energy-resolved STJ observations of the AM Her system V2301 Oph

Cited by 11 publications

References 13 publications

First science with the Southern African Large Telescope: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2

First science with the Southern African Large Telescope: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2

XMM-Newton observations of the eclipsing polar V2301 Oph

Optical/UV and X-Ray Microwave Kinetic Inductance Strip Detectors

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