21ST CENT.AST.W/WKBK+SMARTWORK >BI<
21ST CENT.AST.W/WKBK+SMARTWORK >BI<
6th Edition
ISBN: 9780309341523
Author: Kay
Publisher: NORTON
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Chapter 6, Problem 41QP
To determine

The angular resolution on looking at interstellar molecules using space VLBI.

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There are several spectral features that can be used to characterise galax- ies, including the Hydrogen-a emission at 656.3 nm and the Hydrogen- emission at 486.8 nm. For the Hydrogen-a emission, the spectrograph on the FET just gives sufficient resolution to resolve the emission line, which has a width of 100 km s¹. Calculate the ruling density necessary to observe the Hydrogen- ß emission line at the same resolution, if the observations are taken in first order and in 1-arcsecond seeing.
What diameter telescope is needed to resolve the separation between an Earth-like planet and its star at 550 nm if the linear separation between them is 1 AU and the star system is 4 pc from Earth? (Give your answer in m.) m
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