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AstroKahve

Astronomi ve uzay üzerine sohbetler


Dünya’nın bir çok yerinde aktif olan Astronomy on Tap etkinliklerine benzer şekilde astronom ve astrofizikçilerin toplum ile etkileşimini kolaylaştırmayı hedefleyen AstroKahve etkinliklerine konuşmacının seçtiği, gündemde yer alan bir konu çevresinde her yaştan dinleyiciye hitap eden astronomi sohbetleri gerçekleştirilmektedir. 2019’da İstanbul’da başlayan etkinlikler, daha sonra Ankara, Antalya ve Samsun’da gerçekleştirildi. 2020’de devam edecek ve ülkenin bir çok yerine yayılmayı hedefleyen AstroKahve etkinlikleri ile ilgili fikir, öneri ve sorularınız için Contact kısmından iletişime geçebilir, sosyal medyadan da takip edebilirsiniz.

Twitter:@Astro_Kahve

Instagram:@astrokahve

Facebook: @astrokahve

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Yıldız Yolu

Kız çocuklarının rol model olarak alabilecekleri bilim kadınlarını görebilmesi ve astronominin ve bilimin Türkiye’nin büyük şehirleri dışındaki yerlerde de erişilebilirliğinin sağlanmasını hedefleyen Yıldız Yolu Projesi öncelikle kız çocuklarının örnek alabileceği bilim kadınlarını sınıflara taşıyabilmeyi ve canlı örnekler olarak ekipçe öğrencilerle etkileşime geçmeyi amaçlıyor. Detaylı bilgi için sosyal medya hesaplarını takip edebilir, soru ve önerilerinizi yildizyolu2020@gmail.com e-posta adresine iletebilirsiniz. Twitter:@yildizyolutr Instagram:@yildizyolutr Facebook: @YildizYolu2020
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AstroNotlar

2019’un Ocak ayından itibaren her pazar günü yayınladığımız AstroNotlar’da haftalık astronomi ve uzay haberlerinin yanı sıra çeşitli astronomi konularına da değiniyoruz. Podcast olarak yayınladığımız bölümlerin yazılı hallerini de astronotlar.space adresindeki websitemizde çeşitli görseller ve kullandığımız kaynaklarla birlikte okuyuculara sunuyoruz.
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ABOUT

BIO

Born in 1983, Istanbul, Turkey. Graduated from Astronomy and Space Sciences department of Ankara University in 2006. Acquired a scholarship to pursue an MSc at Max Planck Institute für Radioastronomie, Üniversität Bonn. After living in Bonn for 2 years, returned back to Turkey and got her Master’s degree from Erciyes University with her thesis on ‘The relation between the absolute parameters of chromospherically active binary stars and their X-ray properties’ in 2010. Awarded a scholarship for her PhD studies at Queen’s University Belfast, United Kingdom; published a PhD thesis titled ‘Exotic binary stars as products of common- envelope evolution’ under the supervision of Prof. C.S.Jeffery at the Armagh Observatory in 2015.

From the beginning of her astronomy education, she published several scientific and popular articles; organised and volunteered at many country-wide star parties both in Turkey, Germany and the United Kingdom. She also worked as an astronomy teacher during her undergrad for a private school. She has been invited for interviews by various TV and radio channels, including British Broadcasting Corporation (BBC) and Turkish Radio and Television Corporation (TRT). Since 2003 she is also performing as a freelance science journalist at various science magazines and web portals.

Since 2009, she is a member of Space Generation Advisory Council(SGAC) which is a global non-governmental, non-profit organisation in support of the United Nations programme on space applications. At this organisation, she also acted as National Point of Contact for Turkey from 2010 to 2012. Also a fellow of Royal Astronomical Society(RAS) and Turkish Astronomical Society(TAD), a junior member of the International Astronomical Union (IAU), and observation mentor at the American Association of Variable Star Observers (AAVSO).

From June 2015 to September 2017 she worked as a post- doctoral researcher at Korea Astronomy and Space Sciences Institute - Giant Magellan Telescope - Korean Science Group. In 2019-2020 academic year she worked at the Krakow Pedagogical University (Uniwersytet Pedagogiczny w Krakowie) in as an assistant professor.

Her specialities include

  • observations,

  • binary stars,

  • hot subdwarfs,

  • popular astronomy,

  • public outreach,

  • astronomy education,

  • scientific journalism.

Download CV

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RESEARCH

Post-Doctoral Researches

Searching for subdwarf + late-type dwarf (late-M dwarfs and browndwarfs) systems within APOGEE data

Korea-Giant Magellan Telescope Science Group - Center for Large Telescopes - Korea Astronomy and Space Sciences Institute

These sources are known as HW Vir kind of systems and believed to construct a high percentage of subdwarfs despite not proven yet. The aim of this project was to look at the APOGEE spectra of late-type stars in order to find a trace of an sdB companion. Obtaining a high-quality IR observation for such systems would let us learn the physical parameters of the low-mass companion. Despite there are many scenarios to form both single and binary subdwarf stars, binarity in these stars is not well understood. Additionally, there are theories being discussed in the favour of the idea that subdwarfs are essentially a component of binary systems. Yet, the properties of the browndwarf components are mostly unknown, this keeps the formation and evolution of sdBs as a mystery. As the project went on, it evolved in a way to focus on HW Vir system itself. When the APOGEE data quality was not satisfactory to resolve the spectra of components or to improve the current knowledge of the physical parameters, we observed the system with IGRINS in February 2016 and in April 2016. At the final stage of the project, I worked on finding the appropriate models and the most effective approach to apply the model spectra. The solution of the system may help us to improve the parameter set of the cool component and also contribute to revealing the binary nature of sdB stars and common-envelope evolution.

Exploiting the APOGEE dataset for a study on chromospherically active stars

Korea-Giant Magellan Telescope Science Group - Center for Large Telescopes - Korea Astronomy and Space Sciences Institute

The main goal of this project is defining a chromospheric activity indicator in IR region and determining candidates for a ’Chromospherically Active Cool Stars Survey’. These are not very prominent objects in IR compared to optical wavelengths, but the high S/N of APOGEE data together with a systematic study may lead to better use of IR observations of cool stars. By comparing the active and inactive dwarf M (dM) stars at the IR region, it might be possible to determine a common feature of activity, which would be regarded as an indicator in IR. At similar studies, dM stars are one of the biggest exemptions and this study is a candidate to fill this void. Once such an indicator can be defined, it may be useful to find other active cool star candidates. Since the optical activity indicators barely work for dM stars, revealing an activity indicator for the IR region is very difficult yet important and it may allow us to categorise these stars.

PhD

The Extraordinary Outcomes of Common-Envelope Evolution

Prof. Dr C. S. Jeffery & Dr Gavin Ramsay

The aim of my project is to examine binary systems containing at least one unusual hot subdwarf. These systems allow us to explore possible outcomes of common- envelope (CE) ejection in a close binary. Depending on the observational results (i.e. orbital period, mass ratio, chemical abundances, etc.) a conclusion for these exotic systems can be reached regarding an idea of the formation and evolution of He-rich subdwarf binaries, especially regarding the CE evolution. Besides a general perspective on their formation, they will also help us to go further on stellar evolution and confirm our current knowledge about the outcomes of CE evolution. The first object studied was PG 1544+488, an exceptional short-period spectroscopic binary containing two helium-rich subdwarfs. I obtained and improved orbital and atmospheric parameters for each component. We concluded that in a CE binary containing two helium cores of nearly equal mass, the entire hydrogen envelopes of both stars are ejected. This places a very strong constraint on the physics of the CE ejection mechanism. The second object was BILyn and the first goal was to determine whether the relative motion of the two components could be resolved, and subsequently to obtain the dynamical mass ratio. Radial velocities of both components were measured but it was not possible to determine a period. An emission feature at Hα is also observed, which varies within a single night’s observation. The origin of this feature is discussed. Additionally, 17 subdwarf stars, are classified according to their helium abundances. For two of these; I obtained and improved orbital and atmospheric parameters for [CW83]1419-09 and recognised a variability of radial velocity for CD−31◦4800. Exotic binaries like PG1544+488 and BILyn place strong constraints on models for binary-star evolution. Further observations are required for BI Lyn, and to discover other exotic post-common- envelope binaries.

MSc

The relation between the absolute parameters of W UMa stars and their X-ray properties

Assoc. Prof. Dr F. F.Özeren

With this project, I aimed to find the X-ray luminosities of the systems in the most recent Chromospheric Active Binaries Catalogue. The X-ray flux values are taken from the ROSAT All-Sky Survey Faint and Bright Source Catalogues. A system is accepted as the source of the X-ray if the distance between the system and the X-ray source is 90′′ and below, considering the equatorial coordinates. The main purpose was to search if there is any relation between the X-ray luminosities and absolute parameters (e.g. Teff, Lbol, logg) of CABS. Although there was no apparent relationship between LX and these parameters, I defined 330 systems as X-ray sources; updated X-ray luminosities of 214 systems and defined 116 sources for the first time.

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PUBLICATIONS

PUBLICATIONS LIST
04 Jan 2005

Photoelectric Minima of Some Eclipsing Binary Stars

IBVS

  IBVS , No. 5588

Scientific Aksu, O.; Ozavci, I.; Yuce, K.; Tanriverdi, T.; Senavci, H. V.; Yilmaz, M.; Kara, A.; Kaya, F.; Helvaci, M.; Cetintas, C.; Cinar, D.; Ozuyar, D.; Basturk, O.; Aydin, E.; Atlagan, O.; Sener, H. T.; Kabadayi, O.; Yelkenci, K.; Evin, B..

Photoelectric Minima of Some Eclipsing Binary Stars

Aksu, O.; Ozavci, I.; Yuce, K.; Tanriverdi, T.; Senavci, H. V.; Yilmaz, M.; Kara, A.; Kaya, F.; Helvaci, M.; Cetintas, C.; Cinar, D.; Ozuyar, D.; Basturk, O.; Aydin, E.; Atlagan, O.; Sener, H. T.; Kabadayi, O.; Yelkenci, K.; Evin, B..
Scientific
About The Publication
15 Sep 2005

Photoelectric Minima of Some Eclipsing Binary Stars

IBVS

  IBVS, No. 5649

Scientific IBVS , No. 5649, Albayrak,B.; Yuce, K.; Selam, S.O.; Tanriverdi, T.; Okan, A.; Cinar, D.; Topal, S.; Ozgur, E.; Sener, H.T., Ergun,I.; Civelek, E.

Photoelectric Minima of Some Eclipsing Binary Stars

IBVS , No. 5649, Albayrak,B.; Yuce, K.; Selam, S.O.; Tanriverdi, T.; Okan, A.; Cinar, D.; Topal, S.; Ozgur, E.; Sener, H.T., Ergun,I.; Civelek, E.
Scientific
About The Publication
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PUBLIC OUTREACH

Projects
EVENTS
  • 2019

    Scientist for a Day 2018-19

    NASA Science, Solar System Exploration.

    Contest Referee for Turkey
  • April 2017
    Daejeon, S. Korea.

    Daejeon Star Festival

    Ask a Scientist guest
  • Jan 2014
    Belfast, United Kingdom

    Starry Starry Night

  • Sept 2012
    Naples, Italy

    The 63rd International Astronautical Conference

    World Space Week Association team member, Exhibition Boot
  • Jan. 2012
    Belfast, United Kingdom

    Starry Starry Night

  • 2004-2019
    Saklıkent, Antalya, TR

    Ulusal Gökyüzü Gözlem Şenliği

    TUG

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BLOG

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Sunum hazırlamanın püf noktaları

Eskiden sunumlar çoğunlukla bir toplantıda konuşma yapacak iş insanları ve araştırmacılar için bir iletişim yöntemi iken günümüzde lise sıralarından başlayarak eğitim ve iş hayatımızın hemen hemen her gününde ödev, araştırma…

Sosyal medya iletişiminin püf noktaları

Sosyal medya sayesinde hemen herkese erişimimiz kolaylaştı. Sadece ünlülere değil bundan 10 sene önce bölüm koridorunda karşılaşınca başımızı önümüze eğip ceketimizi ilikleyeceğimiz hocalarımıza da. Ancak iletişim kurarken dikkat edilmesi gereken…

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CONTACT