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pro vyhledávání: '"Pretorius, Magaretha L."'
Autor:
Mukai, Koji, Pretorius, Magaretha L.
Recent advances in time-domain astronomy have led to fresh observational insights into intermediate polars, a subtype of magnetic cataclysmic variables generally accreting via a partial accretion disc. These new discoveries include detections of supe
Externí odkaz:
http://arxiv.org/abs/2305.15494
Autor:
Buckley, David A. H., Andreoni, Igor, Barway, Sudhanshu, Cooke, Jeff, Crawford, Steven M., Gorbovskoy, Evgeny, Gromadzki, Mariusz, Lipunov, Vladimir, Mao, Jirong, Potter, Stephen B., Pretorius, Magaretha L., Pritchard, Tyler A., Romero-Colmenero, Encarni, Shara, Michael M., Vaisanen, Petri, Williams, Ted B.
We report on SALT low resolution optical spectroscopy and optical/IR photometry undertaken with other SAAO telescopes (MASTER-SAAO and IRSF) of the kilonova AT 2017gfo (aka SSS17a) in the galaxy NGC4993 during the first 10 days of discovery. This eve
Externí odkaz:
http://arxiv.org/abs/1710.05855
Akademický článek
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Autor:
Santisteban, Juan V. Hernández, Knigge, Christian, Littlefair, Stuart P., Breton, Rene P., Dhillon, Vikram S., Gänsicke, Boris T., Marsh, Thomas R., Pretorius, Magaretha L., Southworth, John, Hauschildt, Peter H.
Brown dwarfs and giant planets orbiting close to a host star are subjected to significant irradiation that can modify the properties of their atmospheres. In order to test the atmospheric models that are used to describe these systems, it is necessar
Externí odkaz:
http://arxiv.org/abs/1605.07132
Autor:
Pretorius, Magaretha L.
We present constraints on the space densities of both non-magnetic and magnetic cataclysmic variables, and discuss some implications for models of the evolution of CVs. The high predicted non-magnetic CV space density is only consistent with observat
Externí odkaz:
http://arxiv.org/abs/1407.3149
Autor:
Pretorius, Magaretha L., Mukai, Koji
We construct a complete, hard X-ray flux-limited sample of intermediate polars (IPs) from the Swift-BAT 70-month survey, by imposing selection cuts in flux and Galactic latitude ($F_X > 2.5 \times 10^{-11}\,\mathrm{erg\,cm^{-2}s^{-1}}$ at 14--195~keV
Externí odkaz:
http://arxiv.org/abs/1405.3908
We use the complete, X-ray flux-limited ROSAT Bright Survey (RBS) to measure the space density of magnetic cataclysmic variables (mCVs). The survey provides complete optical identification of all sources with count rate >0.2/s over half the sky ($|b|
Externí odkaz:
http://arxiv.org/abs/1303.4270
We combine two complete, X-ray flux-limited surveys, the ROSAT Bright Survey (RBS) and the ROSAT North Ecliptic Pole (NEP) survey, to measure the space density (\rho) and X-ray luminosity function (\Phi) of non-magnetic CVs. The combined survey has a
Externí odkaz:
http://arxiv.org/abs/1109.3162
Autor:
Russell, David M., Casella, Piergiorgio, Fender, Rob, Soleri, Paolo, Pretorius, Magaretha L., Lewis, Fraser, van der Klis, Michiel
Time-resolved optical and infrared polarimetric observations of black hole and neutron star low-mass X-ray binaries are presented. Data were acquired with the VLT, UKIRT and HIPPO on the SAAO 1.9-m. We find that for some sources in outburst, a rapidl
Externí odkaz:
http://arxiv.org/abs/1104.0837
Autor:
Pretorius, Magaretha L.
The ESA gamma-ray telescope, INTEGRAL, is detecting relatively more intrinsically rare cataclysmic variables (CVs) than were found by surveys at lower energies. Specifically, a large fraction of the CVs that are INTEGRAL sources consists of asynchron
Externí odkaz:
http://arxiv.org/abs/0901.2841