Investigation of Times of Minima of Selected Early-Type Eclipsing Binaries     

Pavel Mayer  Marek Wolf  P. G. Niarchos  K. D. Gazeas  V. N. Manimanis  Drahomír Chochol 《Astrophysics and Space Science》2006,304(1-4):39-41

New precise times of minimum light for several early-type eclipsing binaries were obtained at three observatories. The changes of period of the following measured binaries are discussed: V1182 Aql, LY Aur, SZ Cam, FZ CMa, QZ Car, LZ Cen, V606 Cen, AH Cep and TU~Mus.  相似文献   

Truncated disc versus extremely broad iron line in XTE J1650−500     

Chris Done  Marek Gierli&#;ski 《Monthly notices of the Royal Astronomical Society》2006,367(2):659-668

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Fuzzy slope stability method     

Marek Kacewicz 《Mathematical Geology》1987,19(8):757-767

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The X-ray spectrum of the atoll source 4U 1608—52     

Marek Gierli&#;ski  Chris Done 《Monthly notices of the Royal Astronomical Society》2002,337(4):1373-1380

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Coelostat and heliostat: Theory of alignment     

Marek Demianski  Jay M. Pasachoff 《Solar physics》1984,93(1):211-217

For perfectly aligned heliostats and coelostats tracking at the solar rate and half the solar rate, respectively, the solar beam has no translational motion. But, particularly in the field at eclipses, it is not possible to align heliostats and coelostats with infinite precision. We derive the effect of small misalignments on the translational motion of the beam, and give tables to allow the calculation of the accuracy to which the instruments must be mounted and adjusted to attain a desired accuracy over a given duration. Further, we show how to derive the necessary adjustments to improve alignment, given measurements of the tracking error.  相似文献   

The host galaxies of luminous quasars   总被引：1，自引：0，他引：1  

David J. E. Floyd  Marek J. Kukula  James S. Dunlop  Ross J. McLure  Lance Miller  Will J. Percival  Stefi A. Baum  Christopher P. O'Dea 《Monthly notices of the Royal Astronomical Society》2004,355(1):196-220

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Crustal and uppermost mantle S-wave velocity below the East European Craton in northern Poland from the inversion of ambient-noise records     

Lepore  Simone  Polkowski  Marcin  Grad  Marek 《International Journal of Earth Sciences》2018,107(6):2043-2062

International Journal of Earth Sciences - The P-wave velocities (Vp) within the East European Craton in Poland are well known through several seismic experiments which permitted to build a...  相似文献   

Book Review     

Marek Lewandowski 《Pure and Applied Geophysics》2013,170(3):485-485

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SphinX: The Solar Photometer in X-Rays     

Szymon Gburek  Janusz Sylwester  Miroslaw Kowalinski  Jaroslaw Bakala  Zbigniew Kordylewski  Piotr Podgorski  Stefan Plocieniak  Marek Siarkowski  Barbara Sylwester  Witold Trzebinski  Sergey V. Kuzin  Andrey A. Pertsov  Yurij D. Kotov  Frantisek Farnik  Fabio Reale  Kenneth J. H. Phillips 《Solar physics》2013,283(2):631-649

Solar Photometer in X-rays (SphinX) was a spectrophotometer developed to observe the Sun in soft X-rays. The instrument observed in the energy range ≈?1?–?15 keV with resolution ≈?0.4 keV. SphinX was flown on the Russian CORONAS–PHOTON satellite placed inside the TESIS EUV and X telescope assembly. The spacecraft launch took place on 30 January 2009 at 13:30 UT at the Plesetsk Cosmodrome in Russia. The SphinX experiment mission began a couple of weeks later on 20 February 2009 when the first telemetry dumps were received. The mission ended nine months later on 29 November 2009 when data transmission was terminated. SphinX provided an excellent set of observations during very low solar activity. This was indeed the period in which solar activity dropped to the lowest level observed in X-rays ever. The SphinX instrument design, construction, and operation principle are described. Information on SphinX data repositories, dissemination methods, format, and calibration is given together with general recommendations for data users. Scientific research areas in which SphinX data find application are reviewed.  相似文献   

Photometric observations of Earth‐impacting asteroid 2008 TC3     

Marek J. KOZUBAL  Forrest W. GASDIA  Ronald F. DANTOWITZ  Peter SCHEIRICH  Alan W. HARRIS 《Meteoritics & planetary science》2011,46(4):534-542

Abstract– A calibrated lightcurve is presented of the near‐Earth asteroid 2008 TC₃, obtained before it impacted Earth on October 7, 2008. The asteroid was observed in unfiltered images from the end of astronomical twilight until the object entered Earth’s shadow about 2 h later. The observations covered a wide range of phase angles from 14.79° to 2.93°, during which the asteroid ranged from 82,000 km to 29,000 km distance from the observer. A method is presented for obtaining photometrically filtered brightness values for the asteroid using unfiltered imaging techniques. Over 1,700 images of the asteroid produce a lightcurve with a peak‐to‐peak variation in V of 0.76 magnitude. Analysis of the lightcurve yields values for H = 30.86 ± 0.01 and G = 0.33 ± 0.03. Combined with other constraints on the kinetic energy and diameter of the asteroid, which suggest a low 1.8 g cm^?3 density and albedo 0.05 ± 0.01, the value of H implies an asteroid of about 4.1 m in diameter, 28 m³ in volume, and 51,000 kg in mass. The determined value of G is out of range for normal, larger asteroids of albedo 0.05–0.15.  相似文献