Education Information
2014 - 2020
2014 - 2020Doctorate
Istanbul University, Faculty Of Science, Astronomy and Space Sciences, Turkey
2011 - 2014
2011 - 2014Postgraduate
Istanbul University, Institute of Graduate Studies In Sciences, Astronomi Ve Uzay Bilimleri Anabilim Dalı, Turkey
2007 - 2011
2007 - 2011Undergraduate
Istanbul University, Faculty Of Science, Astronomy and Space Sciences, Turkey
Dissertations
2020
2020Doctorate
Investigation of the Radial Metallicity Gradient in our Galaxy via Open Clusters
Istanbul University, Faculty Of Science, Astronomy and Space Sciences
2014
2014Postgraduate
Photometric Study of Open Cluster NGC 6811
Istanbul University, Institute of Graduate Studies In Sciences, Astronomi Ve Uzay Bilimleri
Foreign Languages
C2 Mastery
C2 MasteryEnglish
Research Areas
Physics
Astronomy and Astrophysics
Star Systems, Interstellar Medium, The Galaxy, Galactic and Extragalactic Objets and Systems, Cosmology
Natural Sciences
Academic Titles / Tasks
2023 - Continues
2023 - ContinuesAssistant Professor
Istanbul University, Faculty of Science, Astronomy and Space Sciences
2014 - 2023
2014 - 2023Research Assistant PhD
Istanbul University, Faculty Of Science, Astronomy And Space Sciences
Courses
Advising Theses
2024
2024Postgraduate
PHOTOMETRİC AND ASTROMETRİC ANALYSIS OF SELECTED OPEN CLUSTERS
Yontan T. (Advisor)
H.ERÇAY(Student)
2024
2024Postgraduate
PHOTOMETRIC AND ASTROMETRIC ANALYSES OF NEWLY DISCOVERED AND SELECTED OPEN CLUSTERS
Yontan T. (Advisor)
Z.AL(Student)
Published journal articles indexed by SCI, SSCI, and AHCI
2024
2024Photometric and kinematic studies of open clusters Ruprecht 1 and Ruprecht 171
Çakmak H., Yontan T., Bilir S., Soydugan E., Banks T., Raul M., et al.
ASTRONOMISCHE NACHRICHTEN , vol.0, no.0, pp.1-23, 2024 (SCI-Expanded)
2023
2023CCD <i>UBV</i> and Gaia DR3 Analyses of the Open Clusters King 6 and NGC 1605
Gokmen S., Eker Z., YONTAN T., BİLİR S., Tansel A. K., Serap A. K., et al.
ASTRONOMICAL JOURNAL
, vol.166, no.6, 2023 (SCI-Expanded)
2023
2023CCD UBV and Gaia DR3 based analysis of NGC 189, NGC 1758 and NGC 7762 open clusters
Yontan T., Bilir S., Çakmak H., Michel R., Banks T., Soydugan E., et al.
Advances in Space Research
, vol.72, no.4, pp.1454-1473, 2023 (SCI-Expanded)
2022
2022An investigation of open clusters Berkeley 68 and Stock 20 using CCD UBV and Gaia DR3 data
Yontan T.
ASTRONOMICAL JOURNAL
, vol.165, no.3, pp.1-24, 2022 (SCI-Expanded)
2022
2022A Photometric and Astrometric Study of the Open Clusters NGC 1664 and NGC 6939
Koç S., Yontan T., Bilir S., Canbay R., Ak T., Banks T., et al.
ASTRONOMICAL JOURNAL
, vol.163, no.4, 2022 (SCI-Expanded)
2022
2022A STUDY OF THE NGC 1193 AND NGC 1798 OPEN CLUSTERS USING CCD UBV PHOTOMETRIC AND GAIA EDR3 DATA
YONTAN T., ÇAKMAK H., BİLİR S., Banks T., Raul M., Canbay R., et al.
REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA
, vol.58, no.2, pp.333-353, 2022 (SCI-Expanded)
2022
2022The Galactic metallicity gradient shown by open clusters in the light of radial migration
Netopil M., Akkaya Oralhan İ., Çakmak H., Michel R., Karataş Y.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY , vol.509, no.1, pp.421-439, 2022 (SCI-Expanded)
2021
2021A study of the Czernik 2 and NGC 7654 open clusters using CCD UBV photometric and Gaia EDR3 data
Akbulut B., Ak S., Yontan T., Bilir S., Ak T., Banks T., et al.
Astrophysics and Space Science
, vol.366, no.7, 2021 (SCI-Expanded)
2021
2021A study of open clusters Frolov 1 and NGC 7510 using CCD UBV photometry and Gaia DR2 astrometry
Yontan T., Bilir S., Ak T., Akbulut B., Canbay R., Banks T., et al.
ASTRONOMISCHE NACHRICHTEN
, vol.342, no.3, pp.538-552, 2021 (SCI-Expanded)
2020
2020Vilnius photometry and Gaia astrometry of Melotte 105
Banks T., Yontan T., Bilir S., Canbay R.
JOURNAL OF ASTROPHYSICS AND ASTRONOMY
, vol.41, 2020 (SCI-Expanded)
2020
2020Bridging the ultraviolet and optical regions: Transformation equations between GALEX and UBV photometric systems
Bilir S., Alan N., Guctekin S. T., Celebi M., Yontan T., Plevne O., et al.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
, vol.37, 2020 (SCI-Expanded)
2019
2019Metallicity and absolute magnitude calibrations for F-G type main-sequence stars in the Gaia era
Çelebi M., Bilir S., Ak S., Ak T., Bostanci Z. F., Yontan T.
ASTROPHYSICS AND SPACE SCIENCE
, vol.364, no.10, 2019 (SCI-Expanded)
2019
2019CCD UBV photometric and Gaia astrometric study of eight open clusters-ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1 and Stock 21
Yontan T., Bilir S., Bostanci Z. F., Ak T., Ak S., Güver T., et al.
ASTROPHYSICS AND SPACE SCIENCE
, vol.364, no.9, 2019 (SCI-Expanded)
2019
2019Analysis of a detached eclipsing binary at near the turnoff point of the open cluster NGC 6791 in Kepler field
Hoyman B., ÖZDARCAN O., Dervisoglu A., Yontan T., ÇAKIRLI Ö.
NEW ASTRONOMY
, vol.68, pp.10-19, 2019 (SCI-Expanded)
2018
2018CCD UBV photometric study of five open clusters-Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1
Bostanci Z. F., Yontan T., Bilir S., Ak T., Guver T., Ak S., et al.
ASTROPHYSICS AND SPACE SCIENCE
, vol.363, no.7, 2018 (SCI-Expanded)
2016
2016CCD UBV photometry and kinematics of the open cluster NGC 225
Bilir S., Bostanci Z. F., Yontan T., Güver T., Bakış V., Ak T., et al.
ADVANCES IN SPACE RESEARCH
, vol.58, no.9, pp.1900-1914, 2016 (SCI-Expanded)
2016
2016CCD UBV photometry of the open cluster NGC 6819
Ak T., Bostanci Z. F., Yontan T., Bilir S., Güver T., Ak S., et al.
ASTROPHYSICS AND SPACE SCIENCE
, vol.361, 2016 (SCI-Expanded)
2015
2015A comprehensive study of the open cluster NGC 6866
Bostanci Z. F., Ak T., Yontan T., Bilir S., Guver T., Ak S., et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
, vol.453, no.1, pp.1095-1107, 2015 (SCI-Expanded)
2015
2015CCD UBVRI photometry of NGC 6811
Yontan T., Bilir S., Bostanci Z. F., Ak T., Karaali S., Guver T., et al.
ASTROPHYSICS AND SPACE SCIENCE
, vol.355, pp.267-281, 2015 (SCI-Expanded)
2014
2014The early-type near-contact binary system V337 Aql revisited
Tüysüz M., Soydugan F., Bilir S., Soydugan E., Senyuz T., Yontan T.
NEW ASTRONOMY
, vol.28, pp.44-48, 2014 (SCI-Expanded)
2014
2014Colour Transformations between BVRc and g ' r ' i ' Photometric Systems for Giant Stars
Ak S., Ak T., Karaali S., Bilir S., Guctekin S. T., Taş O., et al.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
, vol.31, 2014 (SCI-Expanded)
2013
2013Research performance of Turkish astronomers in the period of 1980-2010
Bilir S., Gogus E., Onal O., Ozturkmen N. D., Yontan T.
SCIENTOMETRICS
, vol.97, pp.477-489, 2013 (SCI-Expanded)
2013
2013A new absolute magnitude calibration for red clump stars
Bilir S., Ak T., Ak S., Yontan T., Bostanci Z. F.
NEW ASTRONOMY
, pp.88-97, 2013 (SCI-Expanded)
2013
2013Luminosity-colour relations for red clump stars
Bilir S., Onal Ö., Karaali S., Cabrera-Lavers A., Cakmak H.
ASTROPHYSICS AND SPACE SCIENCE
, no.2, pp.417-427, 2013 (SCI-Expanded)
2012
2012Local stellar kinematics from RAVE data - III. Radial and vertical metallicity gradients based on red clump stars
Bilir S., Karaali S., Ak S., Onal O., Dagtekin N. D., Yontan T., et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
, vol.421, pp.3362-3374, 2012 (SCI-Expanded)
Articles Published in Other Journals
2023
2023Astrophysical Parameters of the Open Cluster NGC 2509
Yontan T., Koç S.
SAKARYA UNIVERSITY JOURNAL OF SCIENCE , vol.27, no.5, pp.1037-1046, 2023 (Peer-Reviewed Journal)
2023
2023Astrophysical Parameters of the Open Cluster Berkeley 6
Koç S., Yontan T.
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi , vol.12, no.2, pp.369-375, 2023 (Peer-Reviewed Journal)
2023
2023Analysis of the Young Open Cluster Trumpler 2 Using Gaia DR3 Data
Yontan T., Taşdemir S.
Physics and Astronomy Reports , vol.1, no.1, pp.1-10, 2023 (Peer-Reviewed Journal)
2015
2015A new ranking scheme for the institutional scientific performance
Bilir S., Göğüş E., Tas Ö., Yontan T.
JOURNAL OF SCIENTOMETRIC RESEARCH
, vol.4, no.2, pp.70-76, 2015 (ESCI)
2011
2011Samanyolu'nun Kalbi
Bilir S., Yontan T., Önal Taş Ö.
Popüler Bilim , no.211, pp.27-32, 2011 (Non Peer-Reviewed Journal)
Refereed Congress / Symposium Publications in Proceedings
2022
2022NGC 1664 ve NGC 6939 Açık Kümelerinin Fotometrik ve Astrometrik İncelenmesi
Koç S., Bilir S., Yontan T.
22. Ulusal Astronomi Kongresi 11. Ulusal Astronomi Öğrenci Kongresi, İzmir, Turkey, 6 - 08 September 2022, vol.4, no.3, pp.203-207
2022
2022NGC 1664 ve NGC 6939 Açık Kümelerinin Fotometrik ve Astrometrik İncelenmesi
Koç S., Yontan T.
22. Ulusal Astronomi Kongresi, İzmir, Turkey, 6 - 08 September 2022, pp.1-5
2022
2022Berkeley 68 ve Stock 20 Açık Kümelerinin Yer ve Uzay Tabanlı Teleskop Verileriyle İncelenmesi
Yontan T.
22. Ulusal Astronomi Kongresi, İzmir, Turkey, 6 - 08 September 2022, pp.1-6
2022
2022Türkiye’de 1980-2020 Yılları Arası Yapılan Astronomi ve Astrofizik Araştırmalarının Uluslararası Çıktıları
Yontan T., Göğüş E., Bilir S., Dursun D. C., Tanık Öztürk B., Canbay R., et al.
22. Ulusal Astronomi Kongresi 11. Ulusal Astronomi Öğrenci Kongresi, İzmir, Turkey, 6 - 08 September 2022, vol.4, no.3, pp.273-277
2022
2022NGC 1193 ve NGC 1798 Açık Kümelerinin CCD UBV ve Gaia Analizleri
Taşdemir S., Yontan T., Bilir S.
22. Ulusal Astronomi Kongresi 11. Ulusal Astronomi Öğrenci Kongresi, İzmir, Turkey, 6 - 08 September 2022, vol.4, no.3, pp.245-249
2022
2022Güneş Civarındaki Metalce Fakir Yıldızların SED Yöntemiyle Temel Astrofizik Parametrelerinin Tayini
Dursun D. C., Bilir S., Şahin T., Yontan T., Plevne O.
22. Ulusal Astronomi Kongresi 11. Ulusal Astronomi Öğrenci Kongresi, İzmir, Turkey, 6 - 08 September 2022, vol.4, no.3, pp.97-101
2019
2019Transformation Equations Between GALEX and UBV Photometric Systems
Alan N., Bilir S., Tunçel Güçtekin S., Çelebi M., Yontan T., Plevne O., et al.
Galaktik Astronomi Çalıştayı (Galactic Astronomy Workshop), İstanbul, Turkey, 12 - 13 September 2019, vol.1, pp.211-215
2019
2019Photometric and Astrometric Analysis of Four Southern Open Clusters: NGC 3293, NGC 3766, NGC 4755, NGC 6231
Akti A. B., Bostancı Güver Z. F., Yontan T., Bilir S., Ak T., Ak S., et al.
Galaktik Astronomi Çalıştayı (Galactic Astronomy Workshop), İstanbul, Turkey, 12 - 13 September 2019, vol.1, pp.207-210
2019
2019Metalicity and Absolute Magnitude Calibrations for F-G Type Main-Sequence Stars
Çelebi M., Bilir S., Ak S., Ak T., Bostancı Güver Z. F., Yontan T.
Galaktik Astronomi Çalıştayı (Galactic Astronomy Workshop), İstanbul, Turkey, 12 - 13 September 2019, vol.1, pp.167-170
2019
2019CCD UBV Photometric and Gaia Astrometric Study of Eight Open Clusters – ASCC 115, COLLINDER 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, ROSLUND 1 ve STOCK 21
Yontan T., Bilir S., Bostancı Güver Z. F., Ak T., Ak S., Güver T., et al.
Galaktik Astronomi Çalıştayı (Galactic Astronomy Workshop), İstanbul, Turkey, 12 - 13 September 2019, vol.1, pp.197-200
2019
2019Transformation equations between GALEX and UBV photometric systems
Alan N., Bilir S., Güçtekin S. T., Çelebi M., Yontan T., Plevne O., et al.
Turkish Physical Society 35th International Physics Congress, TPS 2019, Konacik-Bodrum, Turkey, 4 - 08 September 2019, vol.2178
2019
2019BERKELEY 8 Açık Kümesinin CCD UBVRI Fotometrisi
Çakmak H., Michel R., Karataş Y.
Galaktik Astronomi Çalıştayı, İstanbul, Turkey, 12 - 13 September 2019, pp.201-205
2015
2015Kinematic and Dynamic Properties of Binary Stars: Angular Momentum and Orbital Period Evolution
Soydugan F., Bilir S., Soydugan E., Demircan O., Eker Z., Tüysüz M., et al.
19. Ulusal Astronomi Kongresi (19th National Astronomy Congress), Ankara, Turkey, 2 - 06 February 2015, vol.1, no.1, pp.9-12
2015
2015A Comprehensive Study of the Open Custer NGC 6866
Bostancı Z. F., Ak T., Yontan T., Bilir S., Çakırlı Ö., Güver T., et al.
19. Ulusal Astronomi Kongresi (19th National Astronomy Congress), Ankara, Turkey, 2 - 06 February 2015, vol.1, no.1, pp.243-246
2015
2015An Overview of Astronomy Studies in Turkey and a New Approach to the Scientific Performance Evaluation of Institutions
Bilir S., Göğüş E., Önal Taş Ö., Yontan T.
19. Ulusal Astronomi Kongresi (19th National Astronomy Congress), Ankara, Turkey, 2 - 06 February 2015, vol.1, no.1, pp.321-325
2015
2015Photometric Study of NGC 6811 Open Cluster
Yontan T., Bilir S., Bostancı Z. F., Ak T., Karaali S., Güver T., et al.
19. Ulusal Astronomi Kongresi (19th National Astronomy Congress), Ankara, Turkey, 2 - 06 February 2015, vol.1, no.1, pp.233-236
2013
2013CCD UBVRI Photometric Observations of NGC 225 Open Cluster
Bostancı Güver F., Ak T., Güver T., Bilir S., Ak S., Yontan T., et al.
Türkiye’deki Teleskoplarla Bilim Sempozyumu (Science with Telescopes in Turkey), İstanbul, Turkey, 1 - 04 December 2013, vol.1, pp.192-196
Other Publications
Supported Projects
2023 - 2026
2023 - 2026Gaia ve Tess Uydu Verilerinde Açık Kümeler: Değişen Yıldız Kesifleri ve Farklı Tür Değişen Yıldızların Parametreleriyle Yaş ve Kimyasal Bolluk Ilişkisinin Araştırılması
TUBITAK Project
Soydugan F.(Executive), Soydugan E., Bilir S., Yontan T.
2022 - 2025
2022 - 2025Samanyolu Galaksisindeki Açık Kümelerin Kinematiği
TUBITAK Project
(Project Abstract)
Yontan T. (Executive), Soydugan E., Çakmak H., Bilir S.
2023 - 2024
2023 - 2024Seçilmiş Açık Kümelerin Gaia III Veri Sürümüyle Analizi
Project Supported by Higher Education Institutions
Bilir S. (Executive), Yontan T., Çakmak H., Tanık Öztürk B., Canbay R., Koç S., et al.
2021 - 2024
2021 - 2024Origin of Metal Poor Stars of Middle Spectral Type in the Solar Vicinity
TUBITAK Project
(Project Abstract)
Şahin T.(Executive), Yontan T., Plevne O., Bilir S.
2021 - 2022
2021 - 2022Berkeley 68, NGC 1664, NGC 6939 ve Stock 20 Açık Kümelerinin Fotometrik ve Astrometrik Çalışması
TUBITAK Project
(Project Abstract)
Yontan T. (Executive)
2019 - 2020
2019 - 2020Czernik 2, Frolov 1, Ngc 7510 Ve Ngc 7654 Açık Kümelerinin Ccd Ubv Fotometrik Ve Gaia Astrometrik Analizi
TUBITAK Project
Bilir S. (Executive)
2016 - 2020
2016 - 2020Galaksimizdeki Radyal Metal Bolluğu Gradyentinin Açık Kümeler Yoluyla İncelenmesi
Project Supported by Higher Education Institutions
YONTAN T., BİLİR S.
2017 - 2018
2017 - 2018Güneş Civarında Yaş-Metal Bolluğu İlişkisinin SDSS Verileriyle Araştırılması
Project Supported by Higher Education Institutions
AK S., ÖNAL TAŞ Ö., BİLİR S., YONTAN T., ATAŞ O. H., AK T., et al.
2014 - 2016
2014 - 2016ÖTEGEZEGENLERİN FOTOMETRİK GÖZLEMLERİ
Project Supported by Higher Education Institutions
AK T. (Executive), YONTAN T., BİLİR S., AK S., GÜVER T., BOSTANCI GÜVER Z. F.
2014 - 2016
2014 - 2016NGC 225 Açık Kümesinin Fotometrik Analizi
Project Supported by Higher Education Institutions
BİLİR S. (Executive), AK S., BOSTANCI GÜVER Z. F., YONTAN T., AK T., GÜVER T.
2011 - 2015
2011 - 2015Çift Yıldızlarda Açısal Momentum ve Yörünge Evrimi
TUBITAK Project
Bilir S., Soydugan F.(Executive), Soydugan E., Tüysüz M.
Scientific Refereeing
August 2021
August 2021ASTRONOMICAL JOURNAL
SCI Journal
Congress and Symposium Activities
02 September 2024 - 06 September 2024
02 September 2024 - 06 September 202423. Ulusal Astronomi Kongresi
Attendee
İstanbul-Turkey
06 September 2022 - 08 September 2022
06 September 2022 - 08 September 202222. Ulusal Astronomi Kongresi
Attendee
İzmir-Turkey
29 November 2021 - 30 November 2021
29 November 2021 - 30 November 2021Yıldız İç Yapı ve Evriminde Güncel Gelişmeler
Invited Speaker
İzmir-Turkey
27 July 2020 - 27 July 2020
27 July 2020 - 27 July 2020Yıldız Kümeleri Üzerine Güncel Çalışmalar
Invited Speaker
İzmir-Turkey
12 September 2019 - 13 September 2019
12 September 2019 - 13 September 2019Galactic Astronomy Workshop
Attendee
İstanbul-Turkey
01 September 2018 - 01 September 2018
01 September 2018 - 01 September 201834. Turkish Physical Society International Physical Congress
Attendee
Muğla-Turkey
01 February 2015 - 01 February 2015
01 February 2015 - 01 February 201519. Ulusal Astronomi Kongresi
Attendee
Ankara-Turkey
01 May 2013 - 01 May 2013
01 May 2013 - 01 May 2013Küçük Teleskoplarla Bilim Çalıştayı: Fırsat Gözlemciliği
Attendee
İstanbul-Turkey
01 August 2010 - 01 August 2010
01 August 2010 - 01 August 2010XVII. Ulusal Astronomi Kongresi
Attendee
Adana-Turkey
01 June 2010 - 01 June 2010
01 June 2010 - 01 June 2010