hw1 - Problem 2: Make a graph of the magnitude difference M...

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

View Full Document Right Arrow Icon
Department of Physics Lior Burko University of Alabama in Huntsville Fall semester, 2008 AST 371: Introduction to Astrophysics Homework Assignment No. 1 Due date: 8/25/2008 Problem 1: a. Based on Arp (1961) , plot the filter response functions S u , S b , and S v as functions of the wavelength. b. Modify the definitions for U-B and B-V to allow for the finite band of the filters and their response function. Recall that integration can be done analytically over a fitted function, or numerically using a data table. c. Plot a color – color diagram for a perfect black body, main sequence stars, giant stars, and supergiant stars. For the black body, assume the convention that B-V=0=U-B for T=7,000K. For the stars, use the data in the table . Draw the black body curve, and then add dots of stars. Use different symbols/colors for stars belonging to the different luminosity classes. Clearly mark the Sun on the diagram.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Problem 2: Make a graph of the magnitude difference M b -M v for a black body as a function of temperature for the temperature range 3,000-30,000K. To simplify the calculation, you may assume that magnitudes are determined in a narrow range of wavelengths around the peak of each filter. Problem 3: For a 300K blackbody, over what range of wavelengths would you expect the Rayleigh Jeans law to be a good approximation? Problem 4: Calculate the energy per squared centimeter per second reaching Earth from the Sun. Problem 5: How does the absolute magnitude of a star vary with the size of the star (assuming the temperature stays constant)? Problem 6: If we double the temperature of a blackbody, by how much must we decrease the surface area to keep the luminosity constant?...
View Full Document

This note was uploaded on 11/23/2011 for the course AST 3003 taught by Professor Staff during the Fall '11 term at University of Central Florida.

Ask a homework question - tutors are online