Lecture 9 : Stellar Structure. Robert Fisher. Items. Average score on midterm 1 was 23 out of 30, with a standard deviation of 3 points. Passing score was 18. Everyone did very well, but if you barely missed the passing score, please speak to me after class.
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Artist’s Conception of a Red Giant Orbiting a Black Hole
Hubble Image of Sirius A/B Visual Binary
Double-line Spectroscopic Binary
Artist’s Conception of Sirius A/B
A. Toomre, 1978
Atomic or Ionized
Single Atom (eg, H, C, O) or Ion (H II, O VI)
Trace warm (~ 1000 - 104 K) gas
in visible range of spectrum
Two or more Atoms (eg, CO, NH3)
Trace cold (~ 10 - 100 K) gas
in radio - infrared range of spectrum
HST + OVRO (Scoville et al, 2004)
Every nucleus is made up of one or more protons and neutrons -- nucleons, with electrons orbiting much further out.
Number of protons gives atomic element.
Total number of protons + neutrons designates isotope.
HR Diagram for Globular M5
Cat’s Eye Nebula