Lecture 1 What are the Stars

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This first lecture takes us through the early evolution of Astrophysics when amazing discoveries began to take place through scientist's efforts to explain celestial observations using known laws of physics. • ABOUT THIS LECTURE • This lecture begins with the reason for the limb darkening of the Sun, and the discovery of Helium in the Sun. It then explains the late 19th century ideas on Stars as globes of gas , supported against gravity by the pressure of the gas. The equation of hydrostatic equilibrium is derived. • ABOUT THE LECTURE SERIES • This lecture series is organized by the Astronomical Society of India as a part of its Golden Jubilee celebrations. Aimed at undergraduate and graduate students, this series of talks by renowned astrophysicist and teacher, Prof G. Srinivasan, starts from the first principles of Physics and builds up the subject rigorously to the present state of our understanding. • Series website: https://astron-soc.in/srini-ana • The website hosts a question bank as well as a list of suggested reading for each lecture (prepared by Dr. Sushan Konar) • ABOUT THE SPEAKER • Professor G. Srinivasan • In a research career spanning more than five decades, his interests have spanned many aspects of physics and astrophysics. He is a passionate teacher and has authored two outstanding Astronomy texts titled ‘What Are The Stars?’ and ‘Can Stars Find Peace?’ He is a Past President of the Astronomical Society of India, and a Past President of the Division on Space and High Energy Astrophysics of the International Astronomical Union. In his distinguished career he has worked at the University of Chicago, USA; the IBM Research Laboratory in Zurich, Switzerland; Chalmers University of Technology, Goteborg, Sweden; the Cavendish Laboratory, University of Cambridge, England and the Raman Research Institute, Bengaluru • Follow us on social media at • / asipoec • / asi.poec • This series is also supported by the IAU OAE Centre in India • / astro4edu_india • / oae-center-india-105698322030674

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