ASTR 1230 (O'Connell) Lecture Notes


7.2 ASTRONOMICAL SPECTROSCOPY


Solar Spec

Spectrum of the Sun (wrapped) from near-ultraviolet (lower left) to near-infrared wavelengths (upper right). From NOAO.


A. INTRODUCTION

Spectroscopy is the study of the distribution with wavelength (or the "spectrum") of the EM energy released by a cosmic source. Typical astronomical spectrographs use prisms or diffraction gratings to disperse light according to its wavelength. The drawing below illustrates a prism spectrograph:

PrismSpec


B. THE POWER OF SPECTROSCOPY

How is this useful?


  Lecture 7   Lecture Index

Web Links:

Last modified May 2011 by rwo

Spectral class/absorption feature diagram © M. Briley. Text copyright © 2001-2011 Robert W. O'Connell. All rights reserved. These notes are intended for the private, noncommercial use of students enrolled in Astronomy 1230 at the University of Virginia.