Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download ASTR2050 Introduction to Astronomy and Astrophysics Studio lab April 1, 2005
Document related concepts
Transcript
ASTR2050 Introduction to Astronomy and Astrophysics Studio lab April 1, 2005 Worksheet NAMES: ________________________ ________________________ Interstellar Reddening This worksheet follows the instructions posted on the course web site. λ (µm) 1/λ N (inside) N0 (outside) log(N/N0) Δm 0.42 _______ _______ _______ _______ _______ _______ _______ _______ ______ 0.64 _______ _______ _______ _______ _______ _______ _______ _______ ______ 0.80 _______ _______ _______ _______ _______ _______ _______ _______ ______ Question. We needed to assume that all the stars visible in the direction of the cloud were in fact behind the cloud, and not in the foreground. Is this assumption a good one? Use the fact that the cloud is 200pc away and covers about 6 arc minutes3on the sky. Assume that the density of stars in our neighborhood is about 1/10 pc .
