Spectral types and Hγ (W Hγ) equivalent widths have been derived from low dispersion (92 Å/mm and 51 Å/mm) spectrograms of the brightest stars in NGC 281, NGC 1893 (Aur OB 2), NGC 6823 (Vul OB 1), NGC ...

The principles involved in setting up any viable system of spectral classification are discussed. Their application is illustrated by reviewing the essential features of the original MK system of two ...

Supernovae are powerful stellar explosions marking the death of stars. Type I supernovae lack hydrogen; Type II supernovae show hydrogen. Type Ia supernovae originate from exploding white dwarfs; Type ...

Astronomers from the University of California (UC), Berkeley and elsewhere have performed spectroscopic and photometric study of a peculiar supernova designated SN 2021ukt, which underwent a ...

BERKELEY, CA — A group of scientists affiliated with the SuperNova Legacy Survey (SNLS) have found startling evidence that there is more than one kind of Type Ia supernova, a class of exploding stars ...

THE emission spectra which we observe in the visible and ultra-violet region are divided into line and band spectra, of which the first type corresponds to electronic changes of state of single atoms ...

It’s easy to forget that stars, just like us, have lifetimes. They’re born, they live, and eventually, they die. And for some stars, their death is dramatic, producing an explosion so powerful it can ...