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Starring Kim Arvidsson Matthew Povich Jamie Riggs Directed by B. Murray Lewis

Limits on OH 5 GHz Maser Emission from an OH/IR Star and a Proto-Planetary Nebula. Starring Kim Arvidsson Matthew Povich Jamie Riggs Directed by B. Murray Lewis. Evolutionary Track of a Solar-Mass Star. Syllabus.

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Starring Kim Arvidsson Matthew Povich Jamie Riggs Directed by B. Murray Lewis

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  1. Limits on OH 5 GHz Maser Emission from an OH/IR Star and a Proto-Planetary Nebula Starring Kim Arvidsson Matthew Povich Jamie Riggs Directed by B. Murray Lewis

  2. Evolutionary Track of a Solar-Mass Star • Syllabus OH/IR Star:Asymptotic giant branch star with dust-rich wind (hence infrared bright) and 18 cm OH maser emission.

  3. Observations with Arecibo OH/IR star (IRAS 16260+3454) in 18 cm (on, L-band) and 5 GHz (on, C-band) Calibration source (B1622+23) for 5 GHz (position switching) PPN (IRAS 18095+2704) in 18 cm (on) and 5 GHz (position switching, three 5 minute integrations)

  4. Reduction process Calibrating the 5 GHz scale to mJy for each of the three lines and each of their polarizations Position switching Difference the on and off spectra Apply noise diode calibration Average the two linear polarizations Formed weighted average of the three integrations for each line Removed polynomial baseline of order 2 Plotted intensity vs. velocity

  5. Results: OH/IR Star • Lines Plotted • 1612.2 MHz • 1665.4 MHz • 1667.4 MHz • 4660.2 MHz • 4750.7 MHz • 4765.6 MHz • (Note: Scans displaced vertically by 20 mJy for display)

  6. Results: Proto-Planetary Nebula • Lines Plotted • 1612.2 MHz • 1665.4 MHz • 1667.4 MHz • 4660.2 MHz • 4750.7 MHz • 4765.6 MHz • (Note: Scans displaced vertically by 20 mJy for display)

  7. Cat’s EyeNebulaExample of young planetary nebula with bipolar structure(optical/X-ray image)

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