White dwarfs are the end of most of stars. Type I Supernova: A white dwarf star pulls matter from a companion star until the dwarf’s dead core re-ignites in a thermonuclear explosion that destroys the star. B. a Type II supernova that blew the core iron into the interstellar medium. We suggest that Type I supernovae result from massive white dwarfs that implode catastrophically at the end of very slow contractions. (auth) View. Stars like the Sun do NOT die as supernovae. E. a Type I supernova, as a result of carbon detonation in a white dwarf. Here we will focus on Type Ia which shows a silicone line. When supernovae were first classified, it was done by looking at spectra.If the spectrum of a supernova contains hydrogen (at visible wavelengths, this would be the Balmer series), the supernova was classed as a Type II, if there was no hydrogen present, it was known as a Type I. One model for how a Type Ia supernova is produced involves the accretion of material to a … Type I supernova is further divided into Type Ia and Type Ib based on the spectra it emits. Type Ia supernovae have become very important as the most reliable distance measurement at cosmological distances, useful at distances in excess of 1000 Mpc. The Crab Nebula is the remnant of a Type II supernova; it contains a neutron star in its center. Type I supernova is further divided into Type Ia and Type Ib based on the spectra it emits. A supernova explosion often blows a star apart, leaving behind a massive core. The known history of supernova observation goes back to 185 AD, when supernova SN 185 appeared; which is the oldest appearance of a supernova recorded by humankind. Some supernova explosions result in the creation of stellar-mass black holes. These slow contractions, which should in some cases require times of the order of the age of the Galaxy, are caused by inverse P-processes that take place in the interiors of the stars. Supernovae come in two flavors: Type 1 and Type II (with subtypes such as Ia and IIa). Figure 1: Core collapse supernovae (top to bottom: Type II, Ib, Ic) Credit: M. Modjaz. All type I’s do not have hydrogen lines. In addition, a Type II supernova leaves behind a compressed stellar core, which is now a neutron star or black hole. Type I Supernovae At that point, electron pressure can no longer balance gravity and the star begins a catastrophic collapse. Here we will focus on Type Ia which shows a silicone line. D. the initial elements formed during and immediately after the big bang. Type Ia: a gaseous supernova remnant, very rich in iron Type II: a gaseous supernova remnant, containing elements heavier than iron. The defining characteristic of a Type I supernova is a lack of hydrogen (vertical teal lines near maximum light as shown in the figure below at 6563Å) in their spectra, whereas Type II supernovae do show spectral lines of hydrogen. 10 m=0.1nm , while the y-axis is a measure of the brightness at various wavelength observed with a spectrograph). Using a type of supernova called a type Ia supernova, astronomers determined both the distance of the galaxy and the redshift of the galaxy. The occurrence of Type I supernovae in different types of galaxies and the possibility of a further subdivision in two groups are discussed. Show abstract. They are then supported by electron pressure because of their intense density. C. the fusion of lighter elements in an alien civilization's nuclear fusion reactor. Using a type of supernova called a type Ia supernova, astronomers determined both the distance of the galaxy and the redshift of the galaxy. supernovae. 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