Current and Future Capabilities of the 74-inch Telescope of Kottamia Astronomical Observatory in Egypt

Azzam, Yosry A.; Ali, Gamal B.; Ismail, Hisham; Haroon, A. A.; Selim, I. M.

doi:10.1007/978-3-642-03325-4_16

Cited by 17 publications

(8 citation statements)

References 3 publications

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“…The two clusters are M39 and N7067. The two sequences are observed by an imaging system based on the 74-inch telescope of the Kottamia Astronomical Observatory and a CCD camera system [13]. Each sequence contains in-focus and out-of-focus frames.…”

Section: Methodsmentioning

confidence: 99%

Application of fuzzy logic on astronomical images' focus measures

Hamdy¹,

Elnagahy²,

Helmy³

2019

Turk J Elec Eng & Comp Sci

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Focus accuracy is an essential factor that affects the quality of astronomical observations. The accurate measurement of celestial objects' properties depends on focus. Automatic focusing is necessary for celestial imaging systems. This paper presents a modified focus measure operator. It also proposes the use of fuzzy logic to transform images because of its tolerance of imprecise and incomplete data. The focus operators are applied to two sequences of star clusters' observations. The experimental results show that the suggested measure's overall score exceeds those of previous operators.

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Section: Methodsmentioning

confidence: 99%

Application of fuzzy logic on astronomical images' focus measures

Hamdy¹,

Elnagahy²,

Helmy³

2019

Turk J Elec Eng & Comp Sci

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“…Photometric observations of the eclipsing binary system V12 in the intermediate-age open cluster NGC 7789 were obtained on 8 and 9 of October, 2013 by using EEV CCD Azzam et al 2010). The CCD 42-40 camera has a format of 2048*2048 pixels with scale equals 0.…”

Section: New Ccd Photometric Observations and Orbital Period Changesmentioning

confidence: 99%

“…42-40 camera attached to the Newtonian focus of the 1.88-m Kottamia reflector telescope in Egypt (see Azzam et al 2010). The CCD 42-40 camera has a format of 2048*2048 pixels with scale equals 0.…”

Section: New Ccd Photometric Observations and Orbital Period Changesmentioning

confidence: 99%

Photometric Investigation of the Totally Eclipsing Contact Binary V12 in the Intermediate-Age Open Cluster NGC 7789

Qian¹,

Essam²,

Wang³

et al. 2015

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AB S T R AC TNGC7789 is an intermediate-age open cluster with an age that is similar to the mean age of contact binary stars. V12 is a bright UMa-type binary star with an orbital period of 0.397day. The first complete light curves of V12 in V, R, and I bands are presented and analyzed with the W-D (Wilson and Devinney) method. The results shows that V12 is an intermediate-contact binary ( f = 43(±2.2)%) with a mass ratio of 3.848, and i t is a W-type contact binary where the less massive component is slightly hotter than the more massive one. The asymmetry of the light curves are explained by the presence of a dark spot on the more massive component. The derived orbital inclination ( i = 83.6 ) indicates that i t is a total eclipsing binary, which suggests that the determined parameters are reliable. The orbital period may show a long-term increase at a rate of P = +2.48(±0.17) × 10 days/year that reveals a rapid mass transfer from the less massive component to the more massive one. However, more observations are needed to confirm this conclusion. The presence of an intermediate-contact binary in an intermediate-age open cluster may suggest that some contact binaries have a very short pre-contact timescale. The presence of a third body or/and stellar collision may help to shorten the pre-contact evolution. Key laboratory of the structure and evolution celestial bodies, Chinese Academy of Sciences,

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“…It was equipped with a 2 k × 2 k EEV 42 − 40 CCD camera, its pixel size of 13.5 µm. The telescope and this CCD camera give us a square field of view of about 10 × 10 arcmin 2 on the sky with a scale of 0.30 arc sec per pixel, more information about the capabilities of Kottamia telescope are presented in [10]. Log of observation gives in Table 1, the numbers of observations for each filter, exposer times and seeing are listed.…”

Section: Observations and Data Reductionmentioning

confidence: 99%

Optical and Infrared Photometric Study of Old Open Star Cluster Berkeley 39

Essam¹,

Selim²

2015

IJAA

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In this paper we present astrophysical parameters of the very old open star cluster Berkeley 39 using 2MASS JHK data and observation of BV CCD photometry (V ~ 21.5 mag) in Johnson-Cousin filters. We have derived reddening, distance, metallicity and age etc. using two color diagrams in near-infrared and optical bands. We have found E B-V = 0.099 ± 0.02, E J-H = 0.018 ± 0.001 and E J-Ks = 0.016 ± 0.001 mag, and the distance modulus of (m-M) 0 = 13.24 ± 0.03 mag, which give a distance of 4.2 ± 0.04 Kpc, and the age of the cluster is 5.6 Gyr with metallicity; Z = 0.008 (obtained from fitting of the observed CMDs with Padova isochrones). The radius of the cluster obtained from the analysis of 2MASS data is equal 9.0 ± 0.13 arc minutes; it reflects that the cluster have large radius with new cluster center. Luminosity and mass functions have been investigated as well as the dynamical relaxation time of the cluster Berkeley 39.

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Current and Future Capabilities of the 74-inch Telescope of Kottamia Astronomical Observatory in Egypt

Cited by 17 publications

References 3 publications

Application of fuzzy logic on astronomical images' focus measures

Application of fuzzy logic on astronomical images' focus measures

Photometric Investigation of the Totally Eclipsing Contact Binary V12 in the Intermediate-Age Open Cluster NGC 7789

Optical and Infrared Photometric Study of Old Open Star Cluster Berkeley 39

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