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Resources Q & A Glossary Acronym Guide Multimedia, Etc Images/Illustrations Animation & Video Special Features The Big Chandra Picture Presentations Handouts Web Shortcuts Chandra Blog RSS Feed Image Use Policy Questions & Answers Glossary of Terms Q&A: Supernova Remnants and Neutron Stars Q:Where in the galaxy would you expect to find Type I and Type II supernovas? A:The two basic types of supernovas are Type Ia and Type II. Other types, such as Types Ib and Ic, are unusual supernovas that have most of the properties of type II supernovas. Type Ia are believed to be triggered by a large transfer of mass from a companion star onto a white dwarf that pushes the white dwarf over the Chandrasekhar limit. A thermonuclear explosion follows, blowing the entire star apart, and sending material rich in iron and other products of the explosion rushing out into space. Since a white dwarf is involved, Type Ia supernovas are expected to be found among old star systems, such as globular clusters, the central bulges of galaxies and elliptical galaxies. Type II supernovas are thought to result from the collapse of a massive star (ten or more times as massive as the Sun) that has reached the end of the red giant stage of evolution, and formed an iron core. The core collapses under the weight of the outer layers of the star. A neutron star is formed, lots of neutrinos and other radiation is emitted, and everything except the neutron star is blown away. Since massive stars are involved, Type II supernovas are found in the spiral arms and other star-forming regions of spiral and disk galaxies, which have lots of gas and dust for the formation of new stars. Back |Index | Next CXC Home | Search | Help | Image Use Policy | Latest Images | Privacy | Accessibility | Glossary | Q&A Photo | Press | Blog | More Feeds [News by email: Chandra Digest] [Contact us: [email protected]] Harvard-Smithsonian Center for Astrophysics60 Garden Street, Cambridge, MA 02138 USAPhone: 617.496.7941 Fax: 617.495.7356 Operated for NASA by SAOThis site was developed with funding from NASA under Contract NAS8-03060. Revised: September 05, 2008