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Visual observations of 1995 Perseid meteor stream made by Polish astronomy amateurs are reported. Using this material we obtained new accurate points in the activity profile during maximum. The Zenithal Hourly Rates (ZHRs) for the whole period of activity are presented. We also discuss the magnitude, the colour and the velocity distributions of Perseids. 相似文献
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Vol’vach L. N. Vol’vach A.E. Larionov M.G. MacLeod G. C. van den Heever S. P. Wolak P. Olech M. Ipatov A.V. Ivanov D.V. Mikhailov A. G. Mel’nikov A.E. Menten K. Belloche A. Weiss A. Mazumdar P. Schuller F. 《Astronomy Reports》2019,63(1):49-65
Astronomy Reports - The results of long-term monitoring of the Galactic maser source IRAS 18316–0602 (G25.65+1.05) in the water-vapor line at frequency f = 22.235 GHz (616–523... 相似文献
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A. Olech P. R. Wo&#;niak C. Alard J. Kaluzny I. B. Thompson 《Monthly notices of the Royal Astronomical Society》1999,310(3):759-764
We present V -band light curves of 61 variables from the core of the globular cluster M5 obtained using a newly developed image subtraction method (ISM). Four of these variables were previously unknown. Only 26 variables were found in the same field using photometry obtained with dophot software. Fourier parameters of the ISM light curves have relative errors up to 11 times smaller than parameters measured from dophot photometry. We conclude that the new method is very promising for searching for variable stars in the cores of the globular clusters and gives very accurate relative photometry with quality comparable to photometry obtained by the Hubble Space Telescope . We also show that the variable V104 is not an eclipsing star as has been suggested, but is an RRc star showing non-radial pulsations. 相似文献
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A. Olech J. Kaluzny I. B. Thompson A. Schwarzenberg-Czerny 《Monthly notices of the Royal Astronomical Society》2003,345(1):86-96
New photometry of RRab and RRc stars in ω Centauri is used to calibrate their absolute magnitudes MV as a function of (a) metallicity and (b) the Fourier parameters of light curves in the V band. The zero point of both calibrations relies on the distance modulus to the cluster derived earlier by the Cluster AgeS Experiment (CASE) project based on observations of the detached eclipsing binary OGLE GC17. For RRab variables, we obtained a relation of MV = (0.26 ± 0.08)[ Fe/H ] + (0.91 ± 0.13) . A dereddened distance modulus to the Large Magellanic Cloud (LMC) based on that formula is μ0 = 18.56 ± 0.14 mag . The second calibration of MV , which is based on Fourier coefficients of decomposed light curves, results in the LMC distance of μ0 = 18.51 ± 0.07 mag . 相似文献
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K. Zloczewski J. Kaluzny W. Krzeminski A. Olech I. B. Thompson 《Monthly notices of the Royal Astronomical Society》2007,380(3):1191-1197
We report the results of photometric monitoring of the Melotte 66 field in BVI filters. 10 variables were identified with nine being new discoveries. The sample includes eight eclipsing binaries of which four are W UMa type stars and one star is a candidate blue straggler. All four contact binaries are likely the members of the cluster based on their estimated distances. 10 blue stars with U − B < −0.3 were detected inside a 14.8 × 22.8 arcmin2 field centred on the cluster. Time series photometry for seven of them showed no evidence for any variability. The brightest object in the sample of blue stars is a promising candidate for a hot subdwarf belonging to the cluster. We show that the anomalously wide main sequence of the cluster, reported in some earlier studies, results from a combination of two effects: variable reddening occurring across the cluster field and the presence of a rich population of binary stars in the cluster itself. The density profile of the cluster field is derived and the total number of the member stars with 16 < V < 21 or 2.8 < M V < 7.8 is estimated conservatively at about 1100. 相似文献
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