scholarly journals High Speed UV Photometry of the AM Her Systems AM Her, VV Pup And V834 Cen, with the Hubble Space Telescope

1996 ◽  
Vol 158 ◽  
pp. 223-224
Author(s):  
K. Schaefer ◽  
H. Bond ◽  
G. Chanmugam
Keyword(s):  
Preliminary Analysis ◽  
High Speed ◽  
Hubble Space Telescope ◽  
Cataclysmic Variables ◽  
Low Frequency ◽  
Gabor Transform ◽  
Periodic Oscillations ◽  
Space Telescope ◽  
Uv Photometry ◽  
Magnetic Cataclysmic Variables

We have used the High Speed Photometer (HSP) aboard the Hubble Space Telescope to observe the magnetic cataclysmic variables VV Pup, AM Her, and V834 Cen in the UV (1400…3300 Å) with 0.01 s time resolution. We detected low frequency flickering in all three systems, and compare the time-scales with the predictions of King (1989). At higher frequencies we searched for shock oscillations from the accretion column(s) in these systems. The data were analyzed using the Gabor transform wavelet-like technique (Heil & Walnut 1989) to search for frequency evolution throughout each observation. Preliminary analysis suggests the detection of rapid UV quasi-periodic oscillations (QPOs) in VV Pup at 0.74 Hz, and at 4.4 Hz in V834 Cen. As in ground based observations, our observations failed to yield any rapid QPOs in AM Her itself.

scholarly journals Preliminary analysis of a Hubble FOS spectrum of VW Hyi in quiescence: A DAZQ white dwarf and accretion belt/ring

1996 ◽  
Vol 158 ◽  
pp. 249-250
Author(s):  
E. M. Sion ◽  
M. Huang ◽  
F. H. Cheng ◽  
I. Hubeny ◽  
P. Szkody
Keyword(s):  
White Dwarf ◽  
Preliminary Analysis ◽  
Hubble Space Telescope ◽  
Uv Spectrum ◽  
Space Telescope ◽  
Dwarf Nova ◽  
Faint Object ◽  
Faint Object Spectrograph

AbstractWe present a preliminary analysis of the UV spectrum of the dwarf nova VW Hyi during early quiescence, obtained with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope (HST). The data were obtained approximately one day after the end of a normal outburst.

scholarly journals Quasi-Periodic and Periodic Oscillations in the Dwarf Nova AH Her

1979 ◽  
Vol 53 ◽  
pp. 403-403
Author(s):  
J.G. Duthie ◽  
R.S. McMillan
Keyword(s):  
Light Curve ◽  
Autocorrelation Function ◽  
High Speed ◽  
Statistical Significance ◽  
Cataclysmic Variables ◽  
Power Spectra ◽  
Photometric System ◽  
Periodic Oscillations ◽  
Dwarf Nova ◽  
High Statistical Significance

With a high speed photometric system we have made extensive observation of the dwarf nova AH Her. We have detected rapid oscillations on two consecutive nights during the recovery portion of the light curve of a typical outburst during the spring of 1979. The periods and the sense of the change of period are consistent with previous observations of rapid oscillations of AH Her. On another occasion we detected quasi-periodic oscillations during the rising portion of an outburst. These are similar in appearance to quasi-periodic oscillations found in other cataclysmic variables in that they appear with high statistical significance in the autocorrelation function but are not apparent in power spectra (Robinson and Nather 1979). However they are different from those reported by Robinson and Nather in the sense that they have the same order of period as the periodic rapid oscillations typical of AH Her. These results will be presented together with a discussion of their Implications.

High-Speed Hubble Space Telescope Ultraviolet photometry of two DB white dwarfs: Nonradial and radial pulsations

1994 ◽  
Vol 107 ◽  
pp. 298 ◽  
Author(s):  
Steven D. Kawaler ◽  
Howard E. Bond ◽  
Lisa E. Sherbert ◽  
Todd K. Watson
Keyword(s):  
High Speed ◽  
White Dwarfs ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Radial Pulsations

scholarly journals The Polarization of the Crab Pulsar with HST

1996 ◽  
Vol 160 ◽  
pp. 301-302
Author(s):  
Joseph F. Dolan ◽  
Patricia T. Boyd ◽  
Robert J. Hill ◽  
F. Graham-Smith ◽  
A. G. Lyne ◽  
...  
Keyword(s):  
Time Resolution ◽  
Linear Polarization ◽  
High Speed ◽  
Hubble Space Telescope ◽  
Position Angle ◽  
Crab Pulsar ◽  
Pulse Profile ◽  
Space Telescope ◽  
Pulse Phase ◽  
Sample Time

The linear polarization of the Crab pulsar as a function of pulse phase was observed by the High Speed Photometer on the Hubble Space Telescope in March, 1993. Observations were obtained in a bandpass centered on 2770 A using a 0.25 ms sample time, corresponding to a time resolution of 0.0075 in pulse phase. The UV polarization of the pulsar [Fig. 1] is strikingly similar to that observed in the visible (cf. Smith et al. 1988). The same values of polarization and the same swing of position angle occur through the main and secondary pulses. The polarization pulse profile must be essentially wavelength independent at frequencies above the infrared.

scholarly journals High-Speed Photo-Polarimetry of Magnetic Cataclysmic Variables

2015 ◽  
Vol 2 (1) ◽  
pp. 139-142
Author(s):  
S. B. Potter
Keyword(s):  
High Speed ◽  
Cataclysmic Variables ◽  
Magnetic Cataclysmic Variables

I review recent highlights of the SAAO High-speed Photo-POlarimeter (HIPPO) on the study of magnetic Cataclysmic Variables. Its high-speed capabilities are demonstrated with example observations made of the intermediate polar NY Lup and the polar IGRJ14536-5522.

A Search for a Pulsar in the Remnant of SN 1987A with the Hubble Space Telescope High-Speed Photometer

1995 ◽  
Vol 446 ◽  
pp. 832 ◽  
Author(s):  
J. W. Percival ◽  
P. T. Boyd ◽  
J. D. Biggs ◽  
J. F. Dolan ◽  
R. C. Bless ◽  
...  
Keyword(s):  
High Speed ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Sn 1987A

Preliminary analysis of an ultraviolet Hubble Space Telescope faint object camera image of the center of M31

1992 ◽  
Vol 397 ◽  
pp. L35 ◽  
Author(s):  
I. R. King ◽  
J. M. Deharveng ◽  
R. Albrecht ◽  
C. Barbieri ◽  
J. C. Blades ◽  
...  
Keyword(s):  
Preliminary Analysis ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Camera Image ◽  
Faint Object

SPIN PERIODICITY MEASUREMENTS OF WHITE DWARFS HOSTED IN SOUTHERN HARD X–RAY INTERMEDIATE POLAR CANDIDATES

2010 ◽  
Vol 19 (06) ◽  
pp. 797-803
Author(s):  
ILEANA ANDRUCHOW ◽  
NICOLA MASETTI ◽  
DOMITILLA DE MARTINO ◽  
SERGIO A. CELLONE ◽  
ELENA MASON ◽  
...  
Keyword(s):  
Optical Spectroscopy ◽  
White Dwarf ◽  
Preliminary Analysis ◽  
Cataclysmic Variables ◽  
Optical Spectra ◽  
X Rays ◽  
Optical Photometry ◽  
X Ray ◽  
Orbital Periods ◽  
Magnetic Cataclysmic Variables

Thanks to the combination of hard X–ray data afforded with the INTEGRAL satellite and optical spectroscopy at various telescopes, a number of new, possibly magnetic, Cataclysmic Variables (CVs) has been recently discovered. We here report on the preliminary analysis of B-band optical photometry performed with the 2.15m "Jorge Sahade" telescope at CASLEO (Argentina) on 5 CVs discovered at hard X–rays with INTEGRAL and which show features of a magnetic white dwarf (WD) in their optical spectra. The aim of these observations is to derive the orbital periods of these systems and the spin periodicity of their accreting WD.

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