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Astronomical Applications Department, U.S. Naval Observatory - thesis (Page 7)

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Astronomical Applications Department, U.S. Naval Observatory - thesis
3 Global Photometry
23
3.1 FUV and Optical Morphology . . . . . . . . . . . . . . . . . . . . 23
3.2 Integrated Magnitudes . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2.1 Optical Magnitudes . . . . . . . . . . . . . . . . . . . . . . 24
3.2.2 FUV Magnitudes . . . . . . . . . . . . . . . . . . . . . . . 25
3.2.3 FUV Growth Curves . . . . . . . . . . . . . . . . . . . . . 26
4 Quantifying Star Formation
34
4.1 FUV and Optical Surface Brightness Pro les . . . . . . . . . . . . 34
4.1.1 FUV Surface Brightness Pro les . . . . . . . . . . . . . . . 34
4.1.2 Optical Surface Brightness Pro les . . . . . . . . . . . . . 40
4.1.3 Radial Continuity of Star Formation . . . . . . . . . . . . 42
4.2 Star Formation Rates . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.2.1 Star Formation Rate Models . . . . . . . . . . . . . . . . . 44
4.2.2 FUV and H Star Formation Rates . . . . . . . . . . . . . 45
4.2.3 Star Formation Rates Compared to Global Parameters . . 47
5 Properties of Star Forming Regions
52
5.1 Photometry of Star Forming Regions . . . . . . . . . . . . . . . . 52
5.1.1 Cluster Model . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.1.2 Determining Age and Extinction for Star Forming Regions 55
5.2 Derived Ages for Star Forming Regions . . . . . . . . . . . . . . . 56
5.2.1 Holmberg II . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5.2.2 IC2574 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
5.2.3 Sextans A . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
5.3 Internal Extinction Estimates . . . . . . . . . . . . . . . . . . . . 58
5.4 Equivalent Number of O Stars . . . . . . . . . . . . . . . . . . . . 59
vi

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