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of 228
pro vyhledávání: '"Ak, T."'
A detailed analysis of ground-based CCD UBV photometry and space-based Gaia Data Release 3 (DR3) data for the open clusters King 6 and NGC 1605 was performed. Using the pyUPMASK algorithm on Gaia astrometric data to estimate cluster membership probab
Externí odkaz:
http://arxiv.org/abs/2311.00054
The spatial distribution, Galactic model parameters and luminosity function of cataclysmic variables (CVs) are established using re-estimated trigonometric parallaxes of {\it Gaia} DR3. The data sample of 1,587 CVs in this study is claimed to be suit
Externí odkaz:
http://arxiv.org/abs/2302.11568
We present results from quasi-simultaneous multiwavelength observations of the Galactic black hole X-ray transient MAXI J1820$+$070 during the decay of the 2018 outburst and its entire subsequent mini-outburst in March 2019. We fit the X-ray spectra
Externí odkaz:
http://arxiv.org/abs/2206.02461
This study calculated astrophysical parameters, as well as kinematic and galactic orbital parameters, of the open clusters NGC 1664 and NGC 6939. The work is based on CCD UBV and Gaia photometric and astrometric data from ground and space-based obser
Externí odkaz:
http://arxiv.org/abs/2202.11126
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:
http://arxiv.org/abs/2107.03462
Autor:
Yontan, T., Bilir, S., Ak, T., Akbulut, B., Canbay, R., Banks, T., Paunzen, E., Ak, S., Bostanci, Z. F.
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:
http://arxiv.org/abs/2012.12269
Autor:
Bilir, S., Alan, N., Guctekin, S. Tuncel, Celebi, M., Yontan, T., Plevne, O., Ak, S., Ak, T., Karaali, S.
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:
http://arxiv.org/abs/2004.05605
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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:
http://arxiv.org/abs/1910.01111
Autor:
Yontan, T., Bilir, S., Bostanci, Z. F., Ak, T., Ak, S., Guver, T., Paunzen, E., Urgup, H., Celebi, M., Akti, B. A., Gokmen, S.
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:
http://arxiv.org/abs/1909.00345