AST201_winter2010_mreid_slideset5_v2_Bb_white

AST201_winter2010_mreid_slideset5_v2_Bb_white - 2/1/2010...

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2/1/2010 1 AST 201 Stars and Galaxies 1 AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid Summary of Stars So Far Their properties temperature : colour/strength of spectral lines distance : parallax luminosity : distance + apparent brightness spectral type : colour/temperature/pattern of spectral lines luminosity class : shape of spectral lines We can organize much of what we know about them using the H-R diagram AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 2 Star Formation AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 3 Stars do not live forever. They are “born” and they “die”. AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 4
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2/1/2010 2 Where are new stars born? How can we know? AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 5 What do you mainly see in the picture of a galaxy on the next slide? AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 6 AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 7 AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 8 Red nebulae hydrogen gas Also, dust and blue stars Lots of blue stars lots of young stars Lots of dust among the gas and stars
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2/1/2010 3 AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 9 Most distant stars we can see are blue because although these stars are rare, they are extremely luminous.
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This note was uploaded on 03/02/2010 for the course AST AST201 taught by Professor Mochnacki during the Spring '10 term at University of Toronto- Toronto.

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AST201_winter2010_mreid_slideset5_v2_Bb_white - 2/1/2010...

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