THE MASSIVE STAR POPULATION IN M101. III. SPECTRA AND PHOTOMETRY OF THE LUMINOUS AND VARIABLE STARS Based on observations with the Multiple Mirror Telescope, a joint facility of the Smithsonian Institution and the University of Arizona and on observations obtained with the Large Binocular Telescope (LBT), an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are: The University of Arizona on behalf of the Arizona university system; I

ABSTRACT We discuss moderate-resolution spectra, multicolor photometry, and light curves of 31 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 va...

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Bibliographic Details
Published in:The Astronomical journal 2015-04, Vol.149 (5)
Main Authors: Grammer, Skyler H., Humphreys, Roberta M., Gerke, Jill
Format: Article
Language:English
Subjects:
galaxies: individual (M101)
supergiants
Online Access:Get full text
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Summary:ABSTRACT We discuss moderate-resolution spectra, multicolor photometry, and light curves of 31 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 luminous blue variable (LBV) candidates and V9 may be in an LBV-like maximum light state or eruption.
ISSN:0004-6256
1538-3881
DOI:10.1088/0004-6256/149/5/152