The Birth of Stars - University of California, Berkeley

The Birth of Stars - University of California, Berkeley

The Birth of Solar Systems Formation of a protostar and disk Collapse of and interstellar cloud

The disk condenses and dissipates A solar system The Birthplace of Stars

The space between the stars is not completely empty. Thin clouds of hydrogen and helium, seeded with the dust from dying stars, form in interstellar space. Hot Stars make their Nurseries glow

The Orion Region Infrared Optical

Dark Clouds gather Molecular Clouds Sometimes (especially in spiral arms), the gas is compressed

enough that the dust is thick and gravity can collapse knots in these molecular clouds to make new stars. Where Stars Begin A little bit of spin goes a

long way Galactic shear and turbulence give every core a little spin (once round in 10 million years). But they get a lot smaller, and the spin goes up to orbital!

It is for this reason that we believe there are many planetary systems it is part and parcel of the star formation process to make a

disk. Typical Galactic spin makes disks about the size of our Solar System The Sword of Orion

The nearest great stellar nursery to us is the great Orion molecular cloud which is about 1000 light years away, and manufacturing stars. This is probably how the typical thousands of star is made.

The glowing tip of a molecular cigar The Orion nebula is powered by 4 high mass luminous stars, which have cleared out their birthplace and are eating at a long cloud pointed at us.

The Trapezium Near them, lower mass stars are forming Hubble Space Telescope

They look like little windsocks The blast from the luminous stars is eating away at the little guys

The heart of them contains a potential new solar system Proplyds are new star-disk systems Orion Proplyds

A whole cluster of new stars is born before us Hundreds of young stars, often with disks, have been seen.

Disks in Orion Orion in the near infrared The Star-Disk System Forms

And emits powerful bipolar jets which extend for many light years

negative image The jet shocks are called Herbig-Haro Objects Orion A

powered by the stellar magnetic field and rotation, and takes away

excess angular momentum piercing back out into the cloud

T Tauri Stars The Young Star is Very ActiveThe magnetic flux is hundreds of times stronger than the Sun,

and huge starspots are seen. The star itself is 3 times bigger. The stage is set for planet formation

We see remnant disks around other stars Star Formation is Beautiful, but ephemeral

Within about 10 million years, the birth-cloud is shredded, and the disks are dissipated. The process of starbirth has ended.

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