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Department of Astronomy and Space Sciences

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INFORMATION ON GRADUATE STUDY PROGRAMME

 

The information and regulations about the graduate programme in Astronomy can be found at the WEB page of the Ankara University Graduate School of Natural and Applied Science. To reach WEB page (in Turkish) of the Graduate School of Natural and Applied Science  click here...

 

 

TEACHING STAFF, THEIR SPECIALITY FIELDS AND CODES

 

Our teaching staff are pursue their scientific researches on the fields listed in the below given table. Subjects of the graduate theses are mainly related on these fields.

 

Title

Name, Surname

Speciality

Field Code

Speciality Fields

Prof. Dr.

Fehmi EKMEKÇİ

801604

Stellar Astrophysics

Stellar Atmospheres

Interacting Binary Stars

Pulsating Stars

Prof. Dr.

Selim O. SELAM

801606

Stellar Astrophysics

Interacting Binary Stars

Extrasolar Planets

Prof. Dr.

Berahitdin ALBAYRAK

801607

Stellar Astrophysics

Stellar Atmospheres

Interacting Binary Stars

POP III Stars

Assoc. Prof. Dr.

Birol GÜROL

801608

Stellar Astrophysics

Interacting Binary Stars

Assoc. Prof. Dr.

Kutluay YÜCE

801609

Stellar Astrophysics

Stellar Atmospheres

Super Giant Stars

Prof. Dr.

Sacit ÖZDEMİR

801610

Stellar Astrophysics

Interacting Binary Stars

High Energy Astrophysics

Assoc. Prof. Dr.

Hakan Volkan ŞENAVCI

801611

Stellar Astrophysics

Interacting Binary Stars

Cool Stars

Assist. Prof. Dr.

Mesut YILMAZ

801612

Stellar Astrophysics

Extrasolar Planets

Interacting Binary Stars

Stellar Atmospheres

Assist. Prof. Dr.

Aslı ELMASLI-AKÇAR

801613

Stellar Astrophysics

Stellar Atmospheres

Pulsating Stars

Assist. Prof. Dr.

Özgür BAŞTÜRK

801614

Stellar Astrophysics

Extrasolar Planets

Interacting Binary Stars

Assist. Prof. Dr.

Şeyma ÇALIŞKAN-TÜRKSOY

801615

Stellar Astrophysics

Stellar Atmospheres

Metal Poor Stars

Interacting Binary Stars

 

 

GRADUATE COURSES, THEIR CREDITS and CONTENTS

 

801501 Structure of Interacting Binary Stars | National Credit: (3,0,0) 3 | ECTS: 3

Origin of binary stars. Orbits, real orbit, projected (apparent) orbit, orbital elements. Circumstances and type of eclipses. Center of mass and center of light of a binary system. Photometric and specroscopic properties. Roche Model. Roche Model for circular and elliptical orbits. Synchronized and unsynchronized rotation. Maximum values for radii and critical orbital periods. Proximity effects; geometrical deformations, limb darkening, gravity darkening and irradiation effects. Mass transfer and accretion disks. Interacting binaries in star clusters.

 

801502 Evolution of Interactıng Binary Stars | National Credit: (3,0,0) 3 | ECTS: 3

Basic concepts of  stellar evolution, orbital angular momentum, mass transfer and orbital evolution, the evolution of low and intermediate mass binaries, the evolution of massive close binaries, common envelopes in binary star evolution, final stages of close binary evolution, structure and evolutionary models for binary stars.

 

801503 Period Problems of the Interacting Binary Stars | National Credit: (3,0,0) 3 | ECTS: 4

The stability of the interacting binary stars’ components and their orbits, the possible causes of the period variations: Analysis of the O-C diagrams, polynomial variations (mass transfer, mass loss), cyclic variations (third body, apsidal motion, magnetic activity), some applications on the period variations.

 

801504 Lıght Curve Analysis Methods | National Credit: (3,0,0) 3 | ECTS: 3

History of light curve modelling. The influence of geometric and radiative parameters to the shape of the light curves. Contribution of “third light” to the observed light curve and its’ reduction. Normalized light curve. Spherical model (RM method). First methods: Kitamura & Kopal’s method. New methods: EBOP, WINK, LIGHT2, BinaryMaker, Wilson-Devinney (WD). The WD-Code: DC and LC sub programmes, definitions of model parameters and their ranges, simultaneous solution of multiple light curves with/without radial velocity curves, spot modelling.

 

801505 Photometry of Stars | National Credit: (3,0,0) 3 | ECTS: 5

Spectral enegy distributions of stars with different spectral type. Discriminating properties of a photometric system. Properties of the photometric bands; wide, intermediate and narrow band systems. Colour and reddening. Relations between photometric and basic stellar parameters. The effect of interstellar medium and Earth’s atmosphere to the photometry. Differential and absolute photometry. Coosing comparison and checek stars. Transformations: between the systems and to the standard system. Primary standard stars. Measurements and reductions, heliocentric correction, calculation of minima times, obtaining the light curve.

 

801506 Extreme Stars | National Credit: (3,0,0) 3 | ECTS: 4

Sun and stars, the faintest (and coolest) stars, the cooler stars, the hottest stars, the brightest stars, the largest stars, the smallest stars, the youngest stars, the oldest stars, the strangest stars, brown dwarfs.

 

801507 Photometric Properties of Variable Stars | National Credit: (3,0,0) 3 | ECTS: 4

Short history on variable stars, their naming conventions and classifications. GCVS based modern classification scheme. Characteristic properties of photometric light curves of variable stars. Eruptive variables. Pulsating variables and basic pulsation theory. Distance indicator objects. Rotating variables. Surface brightness inhomogenities and their photometric consequences caused by chemical pecularity and magnetic activity. Cataclysmic variables. Eclipsing variables. X-ray variables.

 

801508 Spectral Analysis | National Credit: (3,0,0) 3 | ECTS: 4

Radiative transfer and model atmospheres, microscopic processes and statistical equilibrium, line profiles, line formation, stellar spectra, photoionized clouds-gaseous nebula and AGN, photoionized clouds-AGN, te spectrum of the cold interstellar medium, masers, wind and circumstellar shells, very hot thin gases, and coronae.

 

801509 Stars and Their Spectra | National Credit: (3,0,0) 3 | ECTS: 4

Stars, atoms and spectra, the spectral sequence, the M stars: red supergiants to dwarfs, the K stars: orange supergiants to brighter dwarfs, our sun and its cousins: G stars, class F: stars in transition, the white stars  of class A, the B stars:beacons of the skies, class O: the head of spectral sequence, extraordinary classes, journeys on the H-R diagram.

 

801510 Upper Atmospheres of Cool Stars | National Credit: (3,0,0) 3 | ECTS: 4

Sun as a cool star. General properties of chromosphere, transition region and corona layers. Heating mechanisms of upper atmosphere layers. The interaction of plasma with magnetic field in upper atmospheres of cool stars and their consequences. Magnetic Dinamo Model. Magnetic activity and magnetic cycle phenomena and their observational indicators.

 

801511 Spectroscopic Binaries | National Credit: (3,0,0) 3 | ECTS: 3

Spectroscopic binaries, spectroscopic observations, selection of spectral range, observations and data extraction, standard stars for radial velocities, radial velocities from cross-correlation, two-dimensional cross-correlation, systematic errors in radial velocities, tomographic separation of spectra, orbital periods from radial velocities, spectroscopic orbital elements.

 

801512 Stellar Chemical Abundance Analysis | National Credit: (3,0,0) 3 | ECTS: 5

Spectral line identification, main processes for the broadening of spectral lines, line equivalent width measurement, stellar atmospheric parameters, model atmospheres, chemical abundances, synthetic spectra and stellar rotation velocity.

 

801513 Astronomical Image Processing I | National Credit: (3,0,0) 3 | ECTS: 4

CCD’s and CCD Images, Chip Size and Field of View, Pixel Size and Resolution,  Spectral Sensitivity, FITS Image Files, Image Calibration, Image processing with IRAF (Image Reduction and Analysis Facility), Aperture Photometry and transformation the magnitudes to standard system, Crowded Field Photometry, Astrometry.

 

801514 Astronomical Image Processing II | National Credit: (3,0,0) 3 | ECTS: 4

Spectroscopic CCD Images. Prism, Grating and Fiber Spectroscopic CCD Images. The Properties of Echelle and Slit Spectra. Initial CCD Processing. The Ectraction of Spectra from CCD Images, Image Calibration (Wavelength, Flux and Normalize Processes), Radial Velocity Calculation with IRAF.

 

801515 Astronomical Databases | National Credit: (3,0,0) 3 | ECTS: 4

DSS (Digitised Sky Survey). ADS (Astronomical Data Center). GCVS (General Catalogue of Variable Stars) CDS (Centre de Données astronomiques de Strasbourg). SIMBAD astronomical database. Astrometric Catalogues. Photometric Catalogues. Spectroscopic Catalogues. Cross-Identifications Catalogues. Non-Stellar Objects Catalogues. Radio and Far-IR Data Catalogues. High Energy Data Catalogues. Other Catalogues.

 

801516 Relations Between Stellar Parameters | National Credit: (3,0,0) 3 | ECTS: 4

Main stellar parameters. Mass, temperature, radius, distance, absolute magnitude, density, surface gravity and age of stars. Empirical and theoretical relations between these quantities. The benefits and the interpretations of these relations.

 

801517 Models for Internal Structure of Stars | National Credit: (3,0,0) 3 | ECTS: 3

Basic Equations, Polytropes, Homogeneous Stellar Models, Standard Model, Uniform Energy Source Model, Point-Source (Cowling) Model, Simple Models in the U-V Plane, Fully Convective Stars, Chemically Inhomogeneous Models.

 

801520 Astrochemistry I | National Credit: (3,0,0) 3 | ECTS: 4

Systems, the low of thermodynamics, state variable and state functions, partial molal quantities, phase equilibrium, chemical equilibrium, phase rule, homogeneous and heteregeneous mixtures, chemical thermodynamics, electrochemical cells, fuell cells, chemical kinetics, reaction mechanism, reaction rate theories, catalyses, activation energy, chain reactions.

 

801521 Astrochemistry II | National Credit: (3,0,0) 3 | ECTS: 4

Classical physic, quantum physic, relativistic physic, quantum chemistry, partical waves, the postulates of quantum chemistry, exactly soluable systems, orbital and spin angular momentums, many electron atoms and molecules, atomic and moleculer spectroscopy, statistical physic, statistical thermodynamics, atomic and molecular astronomy.

 

801522 High Energy Astrophysics | National Credit: (3,0,0) 3 | ECTS: 5

A few historical notes; some characteristics of high energy particles/cosmic rays and interaction with matter; basİc radiation mechanîsms; X and gama rays and their properties; high energy dedectors and their dedection; celestial objects in high energies; high energy production mechanisms of stellar coronae, supernovae, pulsars, active galaxies and galaxy clusters, quasars and X-ray binaries.

 

801523 X-ray Astronomy | National Credit: (3,0,0) 3 | ECTS: 5

Historical summary and milestones; X-ray satellites and dedector types; compact objects (NS and BH); accretion induced collapse; X-ray pulsars; Eddington limit; timing and spectral analysis of X-ray data; colour -<*olour diagrams in X-rays; low frequency and kHz QPOs; X-ray spectral models; HERA softvvare; some selected samples of RXTE data.

 

801524 Current Computational Techniques in Astronomy | National Credit: (3,0,0) 3 | ECTS: 4

Introduction: What is IDL? A short history; Specifications and comparison with other programming languages; Importing and writing data, data types; Compiling and running; Simple graph plots; Structures of arrays and variables; Flow parameters; Complex array operations; Definition of functions and procedures; 3-D graphics, contour graphics and types of other graphic outputs; Astronomical applications.

 

801525 Extrasolar Planets | National Credit: (3,0,0) 3 | ECTS: 4

Planetary systems; extrasolar planets; detection methods; properties of extrasolar planets; planet formation; Protoplanetary Disks; giant planets; terrestrial planets; brown dwarfs; Super Earth planets; the dynamics of planetary systems; habitable zone; the search for intelligent life.

 

801526 Astroseismology | National Credit: (3,0,0) 3 | ECTS: 4

Physics of oscillations, equations of hydrodynamics, pressure and gravity modes, stellar pulsation phenomenon, pulsation mechanisms accross the HR diagram, observation techniques in astroseismology, frequency analysis, spectral aliasing, mode and period determination, helioseismology.

 

Ankara University, Faculty of Science, Dept. of Astronomy and Space Sciences, TR-06100, Tandogan - ANKARA / TURKEY