Homework 1 Solutions

Hint use the definition for apparent magnitude in

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: , 1 R¤/1 AU = 970”. Thus, to resolve something of size 1 R¤ with 0.1” resolution, that object has to be at a distance of 0.047 pc or 9700 AU. Note that the answers above assume the angular size is the diameter of the object; if you used radii (2x smaller) that was accepted (4) Spectrophotometric Distance Estimates of Binary Stars [30 pts] It is common to estimate the distance of a star based on its spectral type and the average absolute magnitude for that spectral type (determined for similar stars with distance measurements). However, if the star is a binary, this distance will be underestimated. (a) [5 pts] Assume the star ∂ Makeyupus has an identical spectral type as the Sun (absolute V magnitude = 4.83) and an apparent visual magnitude of V = 7.22. How far away would we estimate the star to be in pc? m – M = 5 log d/10pc = 7.22 ­4.83 = 2....
View Full Document

This document was uploaded on 02/26/2014 for the course PHYS 160 at UCSD.

Ask a homework question - tutors are online