Lec Type Ia Supernova & Type II Supernova – Course Note – Fred Xi
Search
Essays
Sign up
Sign in
Contact us
Tweet
Index
/Science
Lec Type Ia Supernova & Type II Supernova
Type Ia supernova:Dense white dwarf attracts some of the material from companion start and mass of white dwarf increases. After it compresses and heats up. Fusion reactions start when mass gets close to chandrasekhar limit at 1.38m.So much energy is released that entire system is disrupted in a gigantic explosion (Type Ia supernova).Note: no hydrogen spectral lines in spectrum of type Ia supernova.Due to high luminosity can see easily at very large distance. They all have the same luminosity.Then we can use[pic 1]To find their distance d. This method is used to find the distances of the most distant galaxies.The life story of a high mass star (m>8m.):Because of their high mass all stages last a shorter period of time.Protostar stage (the star contracts quickly because it has a high mass), main sequence life (m/l)[pic 2]Because of a very high mass the helium core is compressed and heated right away and the fusion of 4He into 12C and 16O proceeds without a pause (no first red giant stage).Nucleosynthesis: formation of heavier nuclei by fusion of the lighter nuclei.[pic 3]Each fusion reaction releases less energy than the previous one and the rate at which the nuclear fuel is used increases with the mass of the nuclei that make up the fuel.A mature supergiant near the end of its life:[pic 4]Lec 11 Type II Supernova[pic 5]The energy is released (they are exothermic reactions).To fuse the nuclei heavier than iron (e.g. silver & gold) the energy must be supplied (the endothermic reactions).The reason for that is that the binding energy per nucleon (proton or neutron) is the highest for iron.
Continue for 1 more page »
Read full document
Download as (for upgraded members)
Citation Generator
MLA 7
CHICAGO
(2019, 02). Lec Type Ia Supernova & Type II Supernova. EssaysForStudent.com. Retrieved 02, 2019, from
“Lec Type Ia Supernova & Type II Supernova” EssaysForStudent.com. 02 2019. 2019. 02 2019 <
"Lec Type Ia Supernova & Type II Supernova." EssaysForStudent.com. EssaysForStudent.com, 02 2019. Web. 02 2019. <
"Lec Type Ia Supernova & Type II Supernova." EssaysForStudent.com. 02, 2019. Accessed 02, 2019.
Essay Preview
By: Fred Xi
Submitted: February 6, 2019
Essay Length: 345 Words / 2 Pages
Paper type: Course Note Views: 195
Report this essay
Tweet
Related Essays
Diabetes Type I, II
The main objective of the research was to determine if height is a factor of lower- extremity amputations among patients with diabetes mellitus (type
532 Words | 3 Pages
Type II Diabetes Mellitus - an Emerging Epidemic
Type II Diabetes Mellitus: An Emerging Epidemic Andy Christensen NSCI 411 March 1, 2005 Diabetes mellitus is a group of metabolic disorders characterized by
1,488 Words | 6 Pages
The Link Between Obesety and Type II Diabetes
Diabetes is a devastating and potentially life threatening disease that affects thousands of Americans each year. The fact of the matter is that although it
1,629 Words | 7 Pages
Diabetes; Type I, Type Ii, Gestational
Guajardo Kimberly Ann Guajardo Brent Angangan Kine 1164 06/18/2018 Diabetes; Type I, Type II, Gestational ‘Diabetes mellitus (DM), commonly referred to as diabetes, is a
777 Words | 4 Pages
Similar Topics
5 Types Tire Recycling Process
Basic Business Types Explained
Get Access to 89,000+ Essays and Term Papers
Join 209,000+ Other Students
High Quality Essays and Documents
Sign up
© 2008–2020 EssaysForStudent.comFree Essays, Book Reports, Term Papers and Research Papers
Essays
Sign up
Sign in
Contact us
Site Map
Privacy Policy
Terms of Service
Facebook
Twitter