Class Notes (836,414)
United States (324,504)
Physics (158)
PHYS 1121 (1)
Moreno (1)
Lecture

Evolution of the Stars.docx

2 Pages
87 Views
Unlock Document

Department
Physics
Course
PHYS 1121
Professor
Moreno
Semester
Fall

Description
Star Formation  Formed from the collapse of interstellar cloud consisted of Hydrogen & Helium  If the mass is not big enough (not enough atoms) it will remain hydrostatic equilibrium  Hydrostatic equilibrium:- gravitational force pushing inward and the heat(Kinetic Energy) pushing outward  Few atoms --> heat prevails over gravity and cloud will disperse  # of atoms increases, cloud undergoes a gravitational collapse  As matter collapse, heat increases, and triggers hydrogen fusion (Proton-Proton chain reaction) = star Medium Sized Stars  When all the Hydrogen from the core is burned, the collapse continues  Hydrogen of the outer shell starts to fuse(shell burning)  Increases size and luminosity = red giant  He consumed rapidly and luminosity increases until the fusion ends  Core shrinks but outer shells are ejected = Planetary Nebulae  All that is left is a small carbon core(still hot) but begins to cool down  Then becomes a white dwarf and then a black dwarf (no longer emits light) Massive Stars  Gravitational force is big  H shell burning starts very soon  Eventually becomes a red supergiant  Supernova:- when the star collapses and produces an extremely large release of energy Supernova explosion:- extremely powerful explosion radiation can outshine a galaxy Type 1: carbon-denotation supernova Type 2: death of a high mass star Leaves remnants - the expanding clouds of material from the explosion The Cycle of Stellar Evolution Form --> Evolve --> Die  Heavy elements are sent into the interstellar medium when
More Less

Related notes for PHYS 1121

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit