The lightcurve of a Type la supernova explosion is observed to peak at an apparent magnitude of m= 16.4 mag. a) Estimate the distance to the galaxy where this explosion occurred in. (Recall that Type la supernovae have a characteristic light curve and associated maximal luminosity. See slides from Lecture 16!) b) Assuming a Hubble constant of 72.9 km/s/M pc, calculate the recession velocity of the supernova (and its host galaxy). c) A characteristic feature observed in the spectra of Type la supernovae is the silicon absorption feature with a rest-frame wavelength of = 635.5 nm. At what wavelength is this feature expected to be observed for the Type la SN considered, given the recession velocity calculated in part (b)?

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Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.