Slide 2:
S. Chandrasekhar
Born in Lahore October 19, 1910
Nephew of Nobel
Laureate Sir C.V.
Raman
Sailed to England
at the age of 19
Slide 8:
Sirius and its companion (the first White
Dwarf to have been discovered)
Average density of a typical white Dwarf:
1000000 times that of water
Sun's radius at present:
696000 kilometres
Sun's radius after it becomes a
White Dwarf:
6000 kilometres
Slide 9:
Globular clusters are gravitationally bound systems consisting of about 1000000 stars
M3 and M4 are well known globular clusters
Slide 10:
Gravity tries to make the star collapse to a point
Pressure opposes the gravitational contraction
Slide 13:
Chandrasekhar Mass Limit = What happens if the core of a star has mass exceeding this limit ?
It becomes a neutron star if its core mass is less than 3.4 times the Sun's mass and a blackhole other wise.
All white dwarfs discovered so far have masses less than Chandrasekhar limit ! S. Chandrasekhar was awarded the Noble prize in 1983 = 1.4 times Sun's mass
Slide 14:
Chandrasekhar's Dynamical Friction (1943)
Slide 19:
Other major contributions by S. Chandrasekhar :
Chandrasekar-Friedman-Schutz Instability (1970)
Chandrasekhar number (1950s)
Opacity due to negative hydrogen ion (1943-1960)
Mathematical theory of blackholes (1983)
“Blackholes are perfect macroscopic objects”
Collision of gravitational waves (1984-1986)
It is amazing that laws of physics discovered on Earth through experiments and theoretical analysis is applicable on Cosmic scales !!
Chandra's works amply demonstrate this efficacy, Beauty and Truth of Physical Laws
Slide 47:
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