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pro vyhledávání: '"T. Yontan"'
Akademický článek
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Publikováno v:
New Astronomy. 68:10-19
We analyzed high-precision Kepler photometry and high-resolution UVES and GIRAFFE spectroscopy from ESO Science Archieve for a double-lined eclipsing binary star in the field of the high metallicity old open cluster NGC 6791. Earlier measurements of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a36c58e9bdf82c967235b2b85821e423
https://doi.org/10.1016/j.newast.2018.10.004
https://doi.org/10.1016/j.newast.2018.10.004
Autor:
Timothy Banks, Ernst Paunzen, T. Yontan, B. Akbulut, Selçuk Bilir, Serap Ak, E. Kaan Ulgen, Tansel Ak
We analysed the open clusters Czernik 2 and NGC 7654 using CCD UBV photometric and Gaia Early Data Release 3 (EDR3) photometric and astrometric data. Structural parameters of the two clusters were derived, including the physical sizes of Czernik 2 be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c31cb406de1262041edac33e84b2a322
Autor:
T. Yontan, Z. F. Bostanci, Selçuk Bilir, Ernst Paunzen, Remziye Canbay, Timothy Banks, Tansel Ak, B. Akbulut, Serap Ak
We present reddening, photometric metallicity, age and distance estimates for the Frolov 1 and NGC 7510 open clusters based on CCD UBV photometric and Gaia data. Photometric observations were collected using the 1-m telescope of the T\"UB\.ITAK Natio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::863f1ab40a31bc47784cdda97991bd7f
https://aperta.ulakbim.gov.tr/record/237414
https://aperta.ulakbim.gov.tr/record/237414
Publikováno v:
Journal of Astrophysics and Astronomy. 41
Archival Vilnius CCD photometric observations are presented for the heavily reddened star cluster Melotte 105, resulting in colour-magnitude diagrams and spectral class estimates. There is considerable lack of agreement between studies for reddening,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01b4f40cb98b80e5b25e5aa13e72d47b
https://doi.org/10.1007/s12036-020-9621-2
https://doi.org/10.1007/s12036-020-9621-2
Autor:
T. Yontan, Serap Ak, M. Celebi, S. Tuncel Guctekin, Salih Karaali, Tansel Ak, Selçuk Bilir, N. Alan, O. Plevne
Publikováno v:
Publications of the Astronomical Society of Australia. 37
We derive transformation equations between GALEX and UBV colours by using the reliable data of 556 stars. We present two sets of equations; as a function of (only) luminosity class, and as a function of both luminosity class and metallicity. The meta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d055f17709b8d2e31756143af1b898f
https://doi.org/10.1017/pasa.2020.12
https://doi.org/10.1017/pasa.2020.12
Akademický článek
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Autor:
Sibel Gokmen, Ernst Paunzen, B. Akti, Tolga Guver, Tansel Ak, H. Urgup, T. Yontan, Serap Ak, Muslim Celebi, Z. F. Bostanci, Selçuk Bilir
In this study, we carried out CCD UBV photometry of eight open clusters, ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1, Stock 21, and determined their reddening, metallicity, distance, age, and mass functions. We used new
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1111ec0d038f79f2a47be2f98c40ee0
https://aperta.ulakbim.gov.tr/record/72337
https://aperta.ulakbim.gov.tr/record/72337
Autor:
M. Celebi, Selçuk Bilir, T. Yontan, Salih Karaali, Tansel Ak, Neslihan Alan, O. Plevne, S. Tuncel Guctekin, Serap Ak
Publikováno v:
TURKISH PHYSICAL SOCIETY 35TH INTERNATIONAL PHYSICS CONGRESS (TPS35).
The insufficiency of photometric data in the U-band of the FGK-type stars in the solar neighborhood makes difficult to determine the flux of the blue region of their spectral energy distributions, and causes to the inadequacy in the estimation of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::effca5dacf902b17c7e5b027a3fd5533
https://doi.org/10.1063/1.5135420
https://doi.org/10.1063/1.5135420
In this study, photometric metallicity and absolute magnitude calibrations were derived using F-G spectral type main-sequence stars in the Solar neighbourhood with precise spectroscopic, photometric and Gaia astrometric data for UBV photometry. The s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5cdfdaa6ee6b2d5ee5ef3bcab1ad8ff1