Data release of the AST3-2 automatic survey from Dome A, Antarctica

Abstract

AST3-2 is the second of the three Antarctic Survey Telescopes, aimed at wide-field time-domain optical astronomy. It is located at Dome A, Antarctica, which is by many measures the best optical astronomy site on the Earth’s surface. Here we present the data from the AST3-2 automatic survey in 2016 and the photometry results. The median 5σ limiting magnitude in i-band is 17.8 mag and the light curve precision is 4 mmag for bright stars. The data release includes photometry for over 7 million stars, from which over 3,500 variable stars were detected, with 70 of them newly discovered. We classify these new variables into different types by combining their light curve features with stellar properties from surveys such as StarHorse.

Effect of Sulfur on Characterization of AgInSe1.8S0.2 Thin Film and n-AgInSe1.8S0.2 / p-Si Solar Cell

“…When Zn substitutes for Ag within AgInSe2, it forms active donor defects. This causes a shift of the Fermi level towards the conduction band, leading to an increase in the carrier concentration [20,21]. The effects of Copper on Ag0.8Cu0.2InSe2 Fabrication and study the influence of vacuum annealing (473,573) K on structure and optical properties [10] The efficiency 3.07% of silver indium selenide with Zinc-diffused [22] the highest efficiency (η = 1.68%) of p-ZnTe/n-AgCuInSe2/p-Si [23] In this study the role of Sulfur S with ratio 0.2 in AIS occupies the anion (Se) and the relatively electronegativity of S (2.58) compared with Ag (1.93), In (1.78), Se (2.55), the selenide and Sulfur are part of the elements of the third period and group VI from Periodic Table [24].…”