Ali Aslantürk

Ondokuz Mayıs Üniversitesi, Djanik, Samsun, Turkey

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Publications (2)1.12 Total impact

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    ABSTRACT: Based on Eratosthenes’ method of “Measuring the Circumference of Earth,” dating from 276 BC, this study is the result of a five- day, three-stage, science school, “I am Learning about My Planet” with the intent of having participants gain understanding of the basic concepts of astronomy in a non-traditional setting and using a non-traditional method. The first stage involved astronomy science schools with 30 primary school teachers and the second stage involved 30 primary school pupils (aged 14). The last stage completed a “Measuring the Circumference of Earth” experimental activity with the participation of both the teachers and the pupils. A pre-test and post-test of 13-items, based on “The Astronomy Diagnostic Test” and the Turkish educational curriculum evaluated changes in participants. A comparison of the data from the teachers and the students produced interesting results, notably that more pupils than teachers answered certain questions correctly. Furthermore, experiment produced a unique instrument for measuring the circumference of Earth, with a calculated margin of error of 0,17%.
    Procedia - Social and Behavioral Sciences 02/2014; 116:3731-3739. DOI:10.1016/j.sbspro.2014.01.832
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    ABSTRACT: We present a new observational campaign, DWARF, aimed at detection of circumbinary extrasolar planets using the timing of the minima of low-mass eclipsing binaries. The observations will be performed within an extensive network of relatively small to medium-size telescopes with apertures of ~20-200 cm. The starting sample of the objects to be monitored contains (i) low-mass eclipsing binaries with M and K components, (ii) short-period binaries with sdB or sdO component, and (iii) post-common-envelope systems containing a WD, which enable to determine minima with high precision. Since the amplitude of the timing signal increases with the orbital period of an invisible third component, the timescale of project is long, at least 5-10 years. The paper gives simple formulas to estimate suitability of individual eclipsing binaries for the circumbinary planet detection. Intrinsic variability of the binaries (photospheric spots, flares, pulsation etc.) limiting the accuracy of the minima timing is also discussed. The manuscript also describes the best observing strategy and methods to detect cyclic timing variability in the minima times indicating presence of circumbinary planets. First test observation of the selected targets are presented.
    Astronomische Nachrichten 06/2012; 333(8). DOI:10.1002/asna.201211722 · 1.12 Impact Factor