Results 1 to 10 of about 3,607 (49)
An Attempt to Construct an Activity Cycle Catalog with Kepler Long-Cadence Light Curves
Universe, 2022 Many stars show activity cycles like the Sun. Kepler has gathered ∼200,000 light curves. Most of the Kepler stars only have long-cadence light curves, which limits their applicable methods.
Yu-Fu Shen, Gang Zhao, Sarah A. Bird
doaj +1 more source
Thermodynamic and structural studies of complexes of manganese(II), cobalt(II), nickel(II) and copper(II) with aminofuropyridine carboxamide [PDF]
Journal of the Serbian Chemical Society, 2003 Complexes of Mn(II), Co(II), Ni(II) and Cu(II) with 2-aminofuro[3,2-b]pyridine-3-carboxamide have been prepared. The stability constants of the formed complexes were determined at 20, 30, 40 and 50ºC at a fixed ionic strength, I = 0.1 mol dm-3 (KCl). The
M. G. ABD EL WAHED
doaj +3 more sources
The New Ephemeris and Light Curve Analysis of V870 Ara by the Ground-Based and TESS Data
Open Astronomy, 2021 New CCD photometric observations and their investigation of the W UMa-type binary, V870 Ara, are presented. Light curves of the system were taken through BVIfilters from the Congarinni Observatory in Australia.
Poro Atila +6 more
doaj +1 more source
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
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. +2 more
doaj +1 more source
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
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 +10 more
doaj +1 more source
Correction of UBV Photometry for Emission Lines
Open Astronomy, 2003 We investigate the effect on U,B,V magnitudes of the removal of emission lines from the spectra of some symbiotic stars and novae during their nebular phases.
Skopal A.
doaj +1 more source
Sensors, 2020 A microfluidic sensor was studied for the photometric detection of active chlorine, total chlorine, and pH in swimming pool samples. The sensor consisted of a four-layer borosilicate glass chip, containing a microchannel network and a 2.2 mm path length,
Sait Elmas +6 more
doaj +1 more source
On the Data Reduction of WET Observations
Open Astronomy, 2003 It is demonstrated how the length of a continuous time-series of photometric data and their gaps affect the power spectrum of a Fourier Transform of the data.
Pakštienė Erika
doaj +1 more source