Astronomy 1021 Lecture Notes - Lecture 32: Sagittarius A*, Solar Mass, Compact Star

• School: Western University
• Department: Astronomy
• Course: Astronomy 1021
• Professor: Robert Cockcroft

Document Summary

From stars to galaxy: now we know our stars. T(cid:455)pes, te(cid:373)peratures, lu(cid:373)i(cid:374)osities, (cid:373)asses, ages : we know all the stars follow the same rules and similar evolutionary paths. We can see how each different star/remnant branches off the others: we ha(cid:448)e(cid:374)(cid:859)t tou(cid:272)hed o(cid:374) (cid:373)u(cid:272)h is (cid:449)here the stars are. Short range order like binaries/clusters yes, but nothing long range. The milky way in the sky: faint band of light, visible from dark locations, brightest near sagittarius, scorpius, dark lanes, all around the celestial sphere or a full 360 degrees. Globular clusters: old, centrally concentrated clusters of stars; mostly in the halo around the galaxy, dense clusters of 50,000 to 1 million stars, old (about 11 billion years), lower- main-sequence stars only, massive ones gone, approx. 200 globular clusters in orbit around our milky way (halo: much bigger than open clusters, but smaller than our galaxy.