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Curriculum Vitae of

Eduard Vorobyov
Address Department of Physics and Astronomy The University of Western Ontario 1151 Richmond Street London, ON, N6A 3K7, Canada Office Phone: (519) 661-2111 ext. 86707 Email: vorobyov@astro.uwo.ca http://www.astro.uwo.ca/~vorobyov/ Research Interests Theoretical Astrophysics ­ Galactic Dynamics ­ Interstellar Medium ­ Dynamics of Protostellar Disks ­ Numerical hydrodynamics and magnetohydrodynamics Education Ph.D. in Astrophysics, October 2001, Special Astronomical Observatory (SAO), Russia Title: Influence of star formation on the large-scale processes in galaxies Work conducted at: Rostov State University Scientific advisor: Dr. V. I. Korchagin (present address: Yale University) M.S. in Physics, June 1992, Rostov State University, Russia Title: Acceleration of ions at interplanetary bow shocks Work conducted at: Rostov State University Scientific Advisor: Dr A. M. Krimski Employment CITA National Fellow 11/2004 ­ The University of Western Ontario, London, Canada Adjunct Professor 9/2006 ­ The University of Western Ontario, London, Canada NATO National Fellow 6/2003 ­ 6/2004 The University of Western Ontario, London, Canada INTAS Young Scientist Fellow 10/2002 ­ 5/2003 Institute of Physics at Rostov State University, Russia Radioastronomisches Institut der Universitat Bonn, Germany

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Research Associate 9/1999 ­ 9/2002 Institute of Physics at Rostov State University, Russia Research Scholar 5/1995 ­ 4/1996 Tata Institute of Fundamental Research, Bombay, India Graduate Student 9/1992 ­ 8/1999 Rostov State University, Rostov-on-Don, Russia Undergraduate Student 9/1985 ­ 6/1992 Rostov State University, Rostov-on-Don, Russia Teaching Experience: · · · · The Interstellar Medium, 302A. The University of Western Ontario, Canada, 2006 Third-year undergraduate two-semester course in Classical Electrodynamics, Physics Faculty, Rostov State University, 2001-2002 Forth-year undergraduate one-semester course in Scientific Computing, Physics Faculty, Rostov State University, 2001-2002 Forth-year undergraduate one-semester course in Extragalactic Astronomy, Physics Faculty, Rostov State University, 2001-2002

Past research and achievements · Many young protostars are known to vary in luminosity. I have developed the first numerical model of gravitational collapse which self-consistently generates accretion and luminosity bursts that can be identified with the eruptions of young protostars known as FU Orionis variables (Vorobyov & Basu, 2005, 2006). It is shown that a protostar has two modes of mass assembly - an early smooth mode when the matter is directly accreted onto the protostar from the infalling envelope and a later burst mode when the matter is episodically accreted onto the protostar from the near-centrifugal protostellar disk. Like the process of throwing logs into a fireplace, the bursts of mass accumulation produce excess energy. As a result, a young star can temporarily brighten by a factor of hundreds to thousands and reveal itself as a FU Orionis variable. These new findings will help understand the processes that limit the masses of young stars and govern the formation of protostellar disks and planets within them. Based on the results of this study, a press-conference was given and a press-release was issued at the 207th Meeting of the American Astronomical Society, January 11, 2006. The interstellar medium of dwarf irregular galaxies is shaped into ring-like structures by energetic processes of uncertain origin. I have numerically demonstrated that such processes as multiple supernova explosions, gamma-ray bursts, and high-velocity cloud collisions create different observable signatures which can be used to pinpoint the cause

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of ring-shaped structures in the interstellar medium of dwarf irregular galaxies (Vorobyov, Klein, Shchekinov & Ott 2004, Vorobyov & Basu 2005). · I have developed the Boltzmann moment equation approach for the dynamics of stars (BEADS-2D), which is a finite-difference Eulerian numerical code designed for the modelling of anisotropic and non-axisymmetric flat stellar disks (Vorobyov & Theis 2006). The BEADS-2D code solves the Boltzmann moment equations up to second order in the thin-disk approximation. This allows us to obtain the anisotropy of the stellar velocity ellipsoid and the vertex deviation in the plane of the disk. In most regions of the stellar disk the velocity ellipsoid is well aligned with the radial axes of the polar grid. In agreement with analytical predictions, considerable vertex deviations show up in regions with strongly perturbed mass distributions, i.e. near the spiral arms. The vertex deviations are large at the convex edge of the spiral arms, whereas they are small at the concave edge. The mean vertex deviations correlate well with the global Fourier amplitudes. Near the convex edge of the spiral arms, the ratio of radial to azimuthal components of the stellar velocity ellipsoid can deviate considerably from the values predicted from the epicycle approximation. Motivated by recent observations of plateaus and minima in the radial abundance distributions of heavy elements in the Milky Way and some other spiral galaxies, I have proposed a dynamical mechanism for the formation of such features around corotation (Vorobyov 2006). The numerical simulations show that the non-axisymmetric gravitational field of spiral density waves generates cyclone and anticylone gas flows in the vicinity of corotation. The anticyclones flatten the pre-existing negative abundance gradients by exporting many more atoms of heavy elements outside corotation than importing inside it. This process is very efficient and forms plateaus of several kiloparsec in size around corotation after two revolution periods of a galaxy. The strength of anticyclones and, consequently, the sizes of plateaus depend on the pitch angle of spiral arms and are expected to increase along the Hubble sequence. I studied numerically the formation of collisional ring galaxies and found that the measured radial velocities of gas in expanding rings seriously underestimate the group velocity of ring propagation (Vorobyov & Bizyaev 2003). I also investigated the applicability of a Schmidt law to star formation in ring galaxies and found that it should be modified to account for large shear motions in the inner rings. A pure (unmodified) Schmidt law greatly overestimates the H fluxes from the inner rings (Vorobyov 2003).

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Invited seminars, talks, and colloquia: "The Boltzmann moment equation approach for the dynamics of collisionless systems" The University of Western Ontario, November 9, 2006 "The Burst mode of Protostellar Accretion" Best-poster talk, "The Early Phases of Star Formation", Germany, September 1, 2006 "Envelope-Induced Gravitational Instability and the Ultimate Fate of Protoplanetary Embryos", Invited talk at The Western Workshop: "From Protostellar Disks to Planetary Systems",

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May 18, 2006
"Episodic Accretion and the Luminosity Bursts in the Early Stages of Star Formation",

Harvard-Smithsonian CfA, April 17, 2006 Rensselaer Polytechnic Institute, April 12, 2006 CITA, University of Toronto, February 27, 2006 University of Waterloo, February 15, 2006 McMaster University, Hamilton, December 1, 2005 The University of Western Ontario, October 13, 2005 "Star Formation in Ring Galaxies", The Institute of Astronomy at the University of Vienna, October 2004 The University of Western Ontario, September, 2003 Institut fÝr Theoretische Physik und Astrophysik, University of Kiel, March 2003 Radioastronomisches Institut der Universitat Bonn, February 2003 Rostov State University, May 2002 Contributed talk at JENAM-2000, May 2000 Press-conference and Press-release Shantanu Basu and Eduard I. Vorobyov Title: " Hungry Young Stars: A New Explanation for the FU Ori Outbursts", 207th Meeting of the American Astronomical Society, Washington, January 11, 2006. http://www.astro.uwo.ca/~basu/aas207/ Organizing Co-organizer of "From Protostars to Protoplanetary Disks", May 18-19, 2006, London, Canada List of Major Publications: 1. Vorobyov, E. I., Theis, Ch., Boltzmann moment equation approach for the numerical study of anisotropic stellar disks, MNRAS, 2006, 373, 197-208. 2. Vorobyov, E. I., Basu, S., The burst mode of protostellar accretion, ApJ, 650, 956-969, 2006 3. Vorobyov, E. I., Spiral stellar density waves and the flattening of abundance gradients in the warm gas component of spiral galaxies, MNRAS, 370, 1046-1054, 2006 4. Vorobyov, E. I., Shchekinov, Yu. A., Radial transport of dust in spiral galaxies, New Astronomy, 11, 240-255, 2006 5. Vorobyov, E. I., Basu, S., The effect of non-isothermality on the gravitational collapse of spherical clouds and the evolution of protostellar accretion, MNRAS, 363, 13611368, 2005 6. Vorobyov, E. I., Basu, S., The Origin of Episodic Accretion Bursts in the Early Stages of Star Formation, ApJL, 633, 137-140, 2005 7. Vorobyov, E. I., Basu, S., The effect of a finite mass reservoir on the collapse of spherical isothermal clouds and the evolution of protostellar accretion, MNRAS, 360,

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8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19.

675-684, 2005 Mayya, Y. D., Bizyaev, D., Romano, R., Garcia-Barreto, J. A., Vorobyov, E. I., ApJL, The Detection of Nonthermal Radio Continuum Spokes and the Study of Star Formation in the Cartwheel, 620, 35-38, 2005 Vorobyov, E. I., Basu, S., Numerical simulations of expanding supershells in dwarf irregular galaxies. II. Formation of giant HI rings, A&A, 431, 451-464, 2005 Vorobyov, E. I., Shchekinov, Yu. A., HI holes in galactic disks: Tracing the dark matter distribution, A&A, 416, 499-505, 2004 Vorobyov, E. I., Klein, U., Shchekinov, Yu. A., Ott, J., Numerical simulations of expanding supershells in dwarf irregular galaxies. I. Application to Holmberg I, A&A, 413, 939-948, 2004 Vorobyov, E. I., Applicability of a Schmidt law to star formation in ring galaxies, A&A, 407, 913-917, 2003 Vorobyov, E. I., Bizyaev, D., Propagation velocities of gas rings in collisional ring galaxies, A&A, 400, 81-93, 2003 Vorobyov, E. I., Bizyaev, D., Radial B-V/V-K color gradients, extinction-free QBVK combined color indices, and the history of star formation of the Cartwheel ring galaxy, A&A, 377, 835-844, 2001 Korchagin, V., Mayya, Y. D., Vorobyov, E. I., Optical Color Gradients in Star-forming Ring Galaxies, ApJ, 554, 281-290, 2001 Korchagin, V., Vorobyov, E. I., Mayya, Y. D., Chemical Abundance Gradients in the Star-forming Ring Galaxies, Astrophysical Journal, 522, 767-771, 1999 Vorobyov, E. I., Tarafdar, S.P., Collapse of Non-isothermal, Non-adiabatic Interstellar Clouds, Astronomy and Astrophysics Transactions, 17, 407-431, 1998 Korchagin, V. I., Mayya, Y.D., Vorobyov, E. I., Khembavi, A.K., Surface Brightness Gradients Produced by the Ring Waves of Star Formation, ApJ, 495, 757- 766, 1998 Korchagin, V. I., Ryabtsev, D. A., Vorobyov, E. I., Bursts of Star Formation Caused by Disk-Halo Mass Exchange, Astronomy and Space Science, 220, 115-129, 1994

Invited reviews Vorobyov E. I. and Shchekinov, Yu. A. 2005, in "Trends in Dark Matter Research", ed. J. Val Blain, Nova Science Publishing, New York. List of recent conference proceedings 1. Theis, Ch., Vorobyov, E. I., "Structure formation in stellar disks - a comparison of polytropic, isotropic, and kinetic approaches", in Galaxy Evolution Across the Hubble Time, IAU Symposium no. 235, held 14-17 August, 2006, S235, p. 389 2. Vorobyov, E. I., Basu, S., "Spiral Structure and Fragmentation in Protostellar Disks", AAS Meeting 207, BAAS, Vol. 37, p.1478 3. Basu, S., Vorobyov, E. I., "The Origin of Episodic Accretion Bursts in the Early Stages of Star Formation", AAS Meeting 207, BAAS, Vol. 37, p.1422 4. Bizyaev, D., Moiseev, A., Vorobyov, E. I., "Modeling the Star Formation History in the Ring Galaxy Arp 10 with the help of Spectral Indices", AAS Meeting 207, BAAS, Vol. 37, p.1385

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5. Basu, S., Vorobyov, E. I., "The Origin of Episodic Accretion Bursts in the Early Stages of Star Formation", in Protostars and Planets V, October 24-28, 2005, Hawaii, LPI Contribution No. 1286., p.8116 List of references 1. Dr. Shantanu Basu, Associate Professor Department of Physics and Astronomy, The University of Western Ontario 1151 Richmond st. London, ON, N6A 3K7 Canada. Email: basu@astro.uwo.ca Phone: 1 (519) 661-2111 ext. 86706 2. Prof. Dr. Uli Klein
Argelander-Institut fÝr Astronomie

Auf dem HÝgel 71 D-53121 Bonn, Germany. Email: uklein@astro.uni-bonn.de Phone: +49 (0)228 / 73-3674 3. Univ.­Doz. Dr. Christian Theis, Associate Professor Institut f. Astronomie der Univ. Wien Tuerkenschanzstr. 17 1180 Wien, Austria Email: theis@astro.univie.ac.at Phone: +43 1 4277 51898 4. Dr. Divakara Mayya, Luis Enrique Erro No. 1 Instututo Nacional de Astrofisica Optica y Electronica Tonantzintla, Puebla, C.P. 72840, Apdo Postal 51 y 216 Pue. MEXICO Email: ydm@inaoep.mx Phone: +52-222-2472011 or 2663100 (extn 1317)

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