PPT Slide
Using A Star’s Spectral Type To Derive Its Distance Is A Technique Called Spectroscopic Parallax….
It Requires A Calibration Of M For Stars Of All Spectral Types…..
Not All Spectral Types Are Represented By Stars In The Solar Neighborhhod
A Way To Get Distances, But Not Always Enough
Errors In Classifying Spectral Affect Distances Quite Severely