S. K. Yerli
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View article: Searching for OB-type pre-supernova binary companions inside supernova remnants
Searching for OB-type pre-supernova binary companions inside supernova remnants Open
We searched for OB-runaway stars inside supernova remnants (SNRs) as a pre-supernova binary companion. As the majority of massive stars are found in close binary systems, a runaway star ejected by the orbital energy after the supernova (SN…
View article: Updated Orbital Decay Rate of WASP-12 with New Data from TESS and Ground-based Observations
Updated Orbital Decay Rate of WASP-12 with New Data from TESS and Ground-based Observations Open
We investigate the orbital decay behavior of the well-studied hot Jupiter WASP-12\,b orbiting its late-F host star on a 1.09-day orbit by analyzing its transit timings. Thanks to precise photometric data covering nearly 15 years of observa…
View article: Global Weather for the Astronomical Observatories
Global Weather for the Astronomical Observatories Open
Astronomical sites occupying observing instruments have to be selected according to many factors. Among these factors, geographic location of the site and quality of atmosphere above the site play an important role in the decision process.…
View article: DAG: Atmosferik ve Astronomik Gözlem Sistemleri
DAG: Atmosferik ve Astronomik Gözlem Sistemleri Open
DAG Projesi kapsamında; gözlemevi yerleşkesine kurulmuş ve kurulacak olan sürekli ölçüm yapan ve yapacak olan atmosferik ve astronomik sistemlerin (AWOS, Davis, Boltwood, ASC, SM, SQM, MASS-DIMM, vb) tanıtımı, teknik özellikleri ve örnek v…
View article: A Case study of light pollution in France after the change in legislation
A Case study of light pollution in France after the change in legislation Open
France issued a decree to restrict and prohibit mainly outdoor lighting effective from January 1st, 2019. Effectiveness of this legislation has been evaluated in this study using GIS data which was first used in \cite{2020MNRAS.493.1204A} …
View article: Global Site Selection for Astronomy
Global Site Selection for Astronomy Open
A global site selection for astronomy was performed with 1 km spatial resolution (∼1 gigapixel in size) using long-term and up-to-date datasets to classify the entire terrestrial surface of the Earth. Satellite instruments are used to get …
View article: DAG Telescope: A New Potential for MOS Observations
DAG Telescope: A New Potential for MOS Observations Open
East Anatolian Observatory (aka. DAG) is a national project supported by the Turkish Government for building a 4m class telescope which will be working in the optical and near-IR domain. As the tender process has been completed and kick-of…
View article: Emission Lines of Northern Planetary Nebulae
Emission Lines of Northern Planetary Nebulae Open
In this work, we present results of long slit spectrophotometric emission line flux observations of selected planetary nebulae (PNe). We have measured absolute fluxes and equivalent widths (EW) of all observable emission lines. In addition…
View article: Observatory building design: a case study of DAG with infrastructure and facilities
Observatory building design: a case study of DAG with infrastructure and facilities Open
Eastern Anatolian Observatory (DAG), will be built in one of the well-known mountain ridges of Erzurum, Turkey, at latitude of 39°46'50, longitude of 41°13'35 and an altitude of 3.151 meters. As well as erecting the largest telescope of Tu…
View article: Project management of DAG: Eastern Anatolia Observatory
Project management of DAG: Eastern Anatolia Observatory Open
The four meter DAG (Eastern Anatolia Observatory in Turkish) telescope is not only the largest telescope in Turkey but also the most promising telescope in the northern hemisphere with a large potential to offer scientific observations wit…
View article: Status of Focal Plane Instrumentation (FPI) project of the 4m DAG telescope
Status of Focal Plane Instrumentation (FPI) project of the 4m DAG telescope Open
DAG (Eastern Anatolia Observatory in Turkish) will be the newest and largest (4m) observatory of Turkey in both optical (VIS) and near-infrared (NIR) with its robust observing site infrastructure. The telescope is designed to house 2 Nasmy…
View article: Integrated opto-dynamic modeling of the 4m DAG telescope image quality performance
Integrated opto-dynamic modeling of the 4m DAG telescope image quality performance Open
The Turkish DAG 4-m telescope is currently through the final design stage. It is to be located on a 3170 m mountain top in Eastern Anatolia. The telescope will be a state-of-The art device, alt-Az mount with active primary and adjustable s…
View article: Design of a derotator for the 4 m DAG telescope
Design of a derotator for the 4 m DAG telescope Open
This paper Silt our work on the design of a field derotator for the adaptive optics instruments platform of DAG (Dogu Anadolu Cozier vi), a new 4 in telescope for astronomical observations near the city of krzurum, l'urkey. While the teles…
View article: Agile development approach for the observatory control software of the DAG 4m telescope
Agile development approach for the observatory control software of the DAG 4m telescope Open
Observatory Control Software for the upcoming 4m infrared telescope of DAG (Eastern Anatolian Observatory in Turkish) is in the beginning of its lifecycle. After the process of elicitation-validation of the initial requirements, we have be…
View article: A microwave kinetic inductance detector for the DAG telescope
A microwave kinetic inductance detector for the DAG telescope Open
We present the details of a proposed microwave kinetic inductance detector (MKID) for the DAG (Eastern Anatolia Observatory in Turkish) telescope, DAG-MKID. The observatory will have a modern 4m size telescope that is currently under const…
View article: The design of an adaptive optics telescope: the case of DAG
The design of an adaptive optics telescope: the case of DAG Open
In this paper, we describe in detail the optical design of DAG, a new 4 m telescope for Turkey. DAG is an "adaptive optics friendly" telescope, in a sense that each design decision is taken considering the potential impact on the AO perfor…
View article: The DAG project, a 4m class telescope: the telescope main structure performances
The DAG project, a 4m class telescope: the telescope main structure performances Open
Dogu Anatolu Gozlemevi (DAG-Eastern Anatolia Observatory) Project is a 4m class optical, near-infrared Telescope and suitable enclosure which will be located at an altitude of similar to 3.170m in Erzurum, Turkey. The DAG telescope is a pr…
View article: Auxiliary free space optical communication project to ensure continuous transfer of data for DAG the 4m telescope
Auxiliary free space optical communication project to ensure continuous transfer of data for DAG the 4m telescope Open
The continuity of the amount of data that the 4m DAG (Eastern Anatolia Observatory in Turkish) telescope will produce and transfer to Ataturk University is critical not to jeopardize the science programs. Though the fiber optics and radio …
View article: DAG: a new observatory and a prospective observing site for other potential telescopes
DAG: a new observatory and a prospective observing site for other potential telescopes Open
DAG (Eastern Anatolia Observatory is read as "Dogu Anadolu Gözlemevi" in Turkish) is the newest and largest observatory of Turkey, constructed at an altitude of 3150 m in Konakll/Erzurum provenience, with an optical and nearinfrared telesc…
View article: DAG telescope site studies and infrastructure for possible international co-operations
DAG telescope site studies and infrastructure for possible international co-operations Open
The selected site for the 4 m DAG (Eastern Anatolian Observatory in Turkish) telescope is at "Karakaya Ridge", at 3170 m altitude (3150 m after summit management). The telescope's optical design is performed by the DAG technical team to al…
View article: Discovery of an OB runaway star inside SNR S147
Discovery of an OB runaway star inside SNR S147 Open
We present first results of a long-term study: Searching for OB-type runaway stars inside supernova remnants (SNRs). We identified spectral types and measured radial velocities by optical spectroscopic observations and we found an early ty…
View article: Emission-Line Fluxes of Northern Planetary Nebulae
Emission-Line Fluxes of Northern Planetary Nebulae Open
We present long slit spectrophotometric emission line fluxes of bright and extended (< 5 arcsec in diameter) planetary nebulae (PNe), selected from a catalogue with suitable equatorial coordinates for northern hemisphere. In total, 17 plan…