نتایج جستجو برای: ultracam
تعداد نتایج: 136 فیلتر نتایج به سال:
We have discovered a pulsating DA white dwarf at the lower end of the temperature range 45 000–30 000 K where a few helium atmosphere white dwarfs are known. There are now three such pulsators known, suggesting that a new class of theoretically predicted pulsating white dwarf stars exists. We name them the hot DAV stars. From high-speed photometric observations with the ULTRACAM photometer on t...
A test area north of Philadelphia was flown with Vexcel Imaging UltraCamD, UltraCamX and Z/I Imaging DMC digital frame cameras as well as with the 3D-CCD-line scanner camera Leica ADS40 and the analogue RC30. The frame images have 60% overlap in both directions. The object resolution is approximately the same with ~ 5cm ground sampling distance (GSD). 42 well defined control and check points ar...
ABSTRACT Using photometric ULTRACAM observations of three new short-period cataclysmic variables (CVs), we model the primary eclipse light curves to extract orbital separation, masses, and radii their component stars. We find donor masses $0.060\pm 0.008\, {\rm M_\odot }$, $0.042\pm 0.001\, 0.004\, two being very low-mass sub-stellar donors, one within 2σ hydrogen burning limit. All systems lie...
ارزیابى عملکرد هندسى دوربین رقومى ابعاد بزرگ (ULTRACAMD) موضوع اصلى این مقاله مى باشد. مفاهیم کالیبراسیون هندسى به روش تعدیل گروهى(bundle adjustment) تشریح شده است. پارامترهاى اضافى مبتنى بر طراحى خاص دوربین، تعیین و تعریف مى گردند و نرم افزار تعدیل گروهى BINGO به منظور اداره این پارامترها ارتقاء داده شده است. تمام پروسه کالیبراسیون شامل چهار مرحله خواهد بود. در اولین...
ABSTRACT We present ULTRACAM multiband optical photometry of two transitional millisecond pulsars (tMSPs), PSR J1023+0038 and J1227−4853, taken while both were in their radio pulsar states. The light curves show significant asymmetry about the flux maxima all observed bands, suggesting an asymmetric source heating system. model using icarus binary code, models with additional ‘hotspot’ contribu...
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