Debris finder, PolCor-2
An instrument to detect debris around young stars

Content:

1. Introduction
2. Exoplanets
3. Stars dust disc
4. Albanova, research center in Stockholm
5. The instrument, PolCor-2
6. The mechanical box's surfaces
7. Coronagraph
8. Mirror set one
9. Filters
10. Lyot Stop
11. Servo motors
12. Polarizer
13. Parabolic and flat mirror set two
14. Lucky Imaging
15. The camera
16. The computer
17. Test of the instrument that has been done
18. Conclusion
19. End of demonstration
20. Follow up with links of information about coronagraphs

9: Filters

Filter holder to the right.

Image above shows the filter holder in the system. This is activated when one wants to study the narrow wavelength ranges, 0.3 nm to 0.5 nm width. Some interesting resonance lines FeI 386 nm, CAII 393 nm, 589 nm Nal and KI 767 nm. Even the more normal filters U, B, V, R and I are available. The filter holder can be loaded with two filters at a time.

• https://en.wikipedia.org/ wiki/Astronomical_filter (Astronomical filter, Wiki)