Results 21 to 30 of about 240,809 (322)

Color Transformations for the 2MASS Second Incremental Data Release [PDF]

, 2001
Transformation equations are presented to convert colors and magnitudes measured in the AAO, ARNICA, CIT, DENIS, ESO, LCO (Persson standards), MSSSO, SAAO, and UKIRT photometric systems to the photometric system inherent to the 2MASS Second Incremental ...
Allen D. A., Bouchet P., Carter B. S., Carter B. S., Engels D., Epchtein N., Glass I. S., Hunt L. K., John M. Carpenter, Johnson H. L., Jones T. J., Jones T. J., Koornneef J., van der Bliek N. S., Wamsteker W.   +14 more
core   +3 more sources

Photometric Determination of Phospholipase A [PDF]

Clinical Chemistry and Laboratory Medicine, 1986
A photometric method for the determination of phospholipase A is described, in which fatty acids are liberated from phosphatidylcholine and measured by a discontinuous enzymatic test. Optimal test conditions were evaluated using purified phospholipase A from human and porcine pancreas.
Hoffmann, G., Schmidt, D., Bastian, B., Guder, W.   +3 more
openaire   +3 more sources

Atmospheric Extinction Corrections for WET Observations

Open Astronomy, 2003
Account of the extinction in the Earth’s atmosphere is an important part of the WET light curve reduction procedures. Usually, WET observations are not corrected for the second order extinction effects: the dependence of the extinction coefficient on ...
Pakštienė E., Solheim J. E.
doaj   +1 more source

The FORS Deep Field: Field selection, photometric observations and photometric catalog [PDF]

, 2002
The FORS Deep Field project is a multi-colour, multi-object spectroscopic investigation of an approx. 7 times 7 region near the south galactic pole based mostly on observations carried out with the FORS instruments attached to the VLT telescopes.
Appenzeller, I., Bender, R., Böhm, Armin, Drory, N., Fricke, K. J., Gabasch, A., Heidt, J., Hopp, U., Jäger, K., Kümmel, M., llenhoff, C., Mehlert, D., Moorwood, A., Möllenhoff, C., Nicklas, H., Noll, S., Saglia, R. P., Seifert, W., Seitz, S., Snigula, J., Stahl, O., Sutorius, E., Szeifert, T., Wagner, S. J., Ziegler, B.   +24 more
core   +2 more sources

More Efficient and Reliable: Identifying RRab Stars with Blazhko Effect by Deep Convolutional Neural Network

Universe
The physical origin of the Blazhko effect (BL), a phenomenon of a single or multiple periodic modulation(s) of the light curve, is under debate. Efficiently identifying and characterizing the BL is essential in understanding its origins and accounting ...
Nan Jiang, Tianrui Sun, Siyuan Pan, Lingzhi Wang, Xue Li, Bin Sheng, Xiaofeng Wang   +6 more
doaj   +1 more source

On a New Technique for Discovering Variable Stars

Open Astronomy, 2003
A technique for discovering variable stars based on the calculation of the correlation coefficients is proposed. Applications of the technique are shown on the results of numerical experiments and on the Hipparcos photometric data.
Mironov A. V., Zakharov A. I., Nikolaev F. N.   +2 more
doaj   +1 more source

Parameterization of long-period eclipsing binaries

Open Astronomy, 2022
One of the important sources for independent determination of stellar masses is eclipsing binaries with components on the main sequence, and with observable spectral lines of both components.
Pakhomova Polina, Berdnikov Leonid, Kniazev Alexei, Katkov Ivan, Malkov Oleg   +4 more
doaj   +1 more source

Calibrated griz magnitudes of Tycho stars: All-sky photometric calibration using bright stars [PDF]

, 2008
Photometric calibration to 5% accuracy is frequently needed at arbitrary celestial locations; however, existing all-sky astronomical catalogs do not reach this accuracy and time consuming photometric calibration procedures are required.
Eran O. Ofek, Hog E.
core   +2 more sources

Photoelectric Vilnius Photometry of Stars in the Mega Proper Motion Field KA 10

Open Astronomy, 2003
Photoelectric seven-color photometry in the Vilnius medium-band, system is obtained for 87 stars down to V≃13.0 in the Kiev proper motion field KA10 [l = 137°, b = -59°]. The size of the field is 1.4 square degrees.
Bartašiutė S.
doaj   +1 more source

METHOD FOR EVALUATING THE ASTROMETRIC AND PHOTOMETRIC CHARACTERISTICS OF COMMERCIAL SCANNERS IN THEIR APPLICATION FOR THE SCIENTIFIC PURPOSE

Odessa Astronomical Publications, 2014
Method  for estimating the accuracy of astrometric  (rectangular coordinates) and photometric (diameters and magnitudes) characteristics of commercial scanners is proposed and applied.
Yu. I. Protsyuk, V. N. Andruk, M. M. Muminov, Q. X. Yuldoshev, Sh. A. Ehgamberdiev, I. Eglitis, M. Eglite, O. E. Kovylianska, V. V. Golovnya, L. V. Kazantseva, S. G. Kashuba   +10 more
doaj   +1 more source