Spectrum of Sun. stellar spectra The Hertzsprung- Russel diagram a.k.a. HR diagram Vertical axis: L * Horiz. axis: T s * color of the star.

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Presentation transcript:

spectrum of Sun

stellar spectra

The Hertzsprung- Russel diagram a.k.a. HR diagram Vertical axis: L * Horiz. axis: T s * color of the star

cartoon showing current idea for how a star forms: (a) denser “cores” form in dense molecular clouds (c) outflows shoot out of poles of the star/disk system (b) the center of a “core” collapses (due to its gravity) to form “proto-star” and disk (d) After clearing: protostar and proto- planetary disk

stage c (almost d): a protostar with disk and jet infrared image optical image

stage “a”: a dense molecular cloud core

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