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The Red Rectangle

The Red Rectangle. “Bizarro” Star?. OR “Rosetta Stone”?. The Backdrop. Mysteries of Interstellar Chemistry. “Diffuse Interstellar Bands” (DIBs). Discovered in 1943 by Paul Merrill 300+ now known Positive ID for carrier for only 2-3 lines (maybe)!! Others “possible”.

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The Red Rectangle

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  1. The Red Rectangle

  2. “Bizarro” Star? OR “Rosetta Stone”?

  3. The Backdrop Mysteries of Interstellar Chemistry

  4. “Diffuse Interstellar Bands” (DIBs) • Discovered in 1943 by Paul Merrill • 300+ now known • Positive ID for carrier for only 2-3 lines (maybe)!! Others “possible”

  5. “Unidentified Infrared Bands” (UIBs): PAHs? HACs? QCCs?

  6. The 2175 Å UV Extinction Band

  7. The Story

  8. Phase I - Era of Discovery Discovery by Cohen + 15 (1975) Extended Red Emission by Schmidt, Cohen & Margon (1980) UV Bands by Sitko, Savage & Meade (1981)

  9. Discovery by Cohen et al. 1975 Red Rectangle Not Blue Blob

  10. UIBs

  11. ????? “Extended Red Emission”

  12. Schmidt, Cohen & Margon (1980)

  13. IUE Spectra by SSM (1981) Unidentified bands between 1400-1800 Å

  14. Organics or CO Fluorescence?

  15. CO 4th Positive Absorption Bands: A1Π⇐X1Σ+

  16. The IR (“The GOOD”)

  17. Waters et al. 1998 (ISO) Mg2SiO4 UIBs

  18. The Visible (“The BAD”)

  19. Red-degraded, Blue degraded and Symmetric profiles

  20. Fluorescence, Phosphorescence, Inter-System Transitions

  21. 1 - fluorescence 2 - phosphorescence 3 - HPB in matrix

  22. Related to DIBs?! Van Winkel et al. (2002)

  23. ERE band shapes: 2.9” (lowest)-5.6” (highest) Approach (but not always equal) DIB wavelengths

  24. The UV (“The UGLY”)

  25. “Blue Luminescence”, small PAHs, and the UV cutoff - Vijh, Witt & Gordon (2005)

  26. CO (0,0) and (1,0) 4th Positive (1996, unpub.) T=3000 K

  27. 4-Component Model Bob Glinski - TN Tech. Cold Low-v Emission Cold High-v Absorption Cold Higher-v Emission Hot Low-v Emission

  28. Cameron Bands

  29. Possible Source for Cameron Bands? (c) HCO+ + e- H + CO(a3Π,v’) (more likely based on abundances) (d) CO2+ + e- CO(a3 Π,v’) + O

  30. 33

  31. Where is the CO Located?4P is less polarized than the continuum Cameron Bands & OH are essentially the same as continuum

  32. - UV pumped “cold fluorescence” OH Emission - “Prompt Emission” photodissociation of H2O

  33. Larry Bernstein, Spectral Sciences, Inc.

  34. Inventory • Silicate dust (C/O < 1) • Organic (PAH?) molecules (C/O > 1) • ERE broad feature • ERE narrow bands - related to DIBs? • CO - 4th Positive, Cameron • OH - Mixture of UV-pumped Cold OH and Photodissociated H2O?

  35. Interesting Curiosity: Who else shows CO A1Π-X1Σ+, CO a3Π-X1Σ+, & OH A1Π-X1Σ+?? COMETS! Photodestruction of the disk (analogous to a Kuiper Belt/Oort Cloud in the Red Rectangle?)

  36. Interesting Aside: UV photolysis of ice mixtures of H2O, NH3, CH3OH, HCN (ISM and comets) produces amino acids….

  37. What About That Crazy Shape? 44

  38. 45

  39. It’s never really THE END

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