%0 Journal Article
%T The Massive Star Population in M101. III. Spectra and Photometry of the Luminous and Variable Stars
%A Skyler H. Grammer
%A Roberta M. Humphreys
%A Jill Gerke
%J Physics
%D 2015
%I arXiv
%R 10.1088/0004-6256/149/5/152
%X We discuss moderate resolution spectra, multicolor photometry, and light curves of thirty-one of the most luminous stars and variables in the giant spiral M101. The majority are intermediate A to F-type supergiants. We present new photometry and light curves for three known "irregular blue variables" V2, V4 and V9) and identify a new candidate. Their spectra and variability confirm that they are LBV candidates and V9 may be in an LBV-like maximum light state or eruption.
%U http://arxiv.org/abs/1502.00308v1