Optical spectra of supernovae
@article{Filippenko1997OpticalSO, title={Optical spectra of supernovae}, author={Alexei V. Filippenko}, journal={Annual Review of Astronomy and Astrophysics}, year={1997}, volume={35}, pages={309-355} }
The temporal evolution of the optical spectra of various types of supernovae (SNe) is illustrated, in part to aid observers classifying supernova candidates. Type II SNe are defined by the presence of hydrogen, and they exhibit a very wide variety of photometric and spectroscopic properties. Among hydrogen-deficient SNe (Type I), three subclasses are now known: those whose early-time spectra show strong Si II (Ia), prominent He I (Ib), or neither Si II nor He I (Ic). The late-time spectra of…
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