MULTI-EPOCH BVRI PHOTOMETRY OF LUMINOUS STARS IN M31 AND M33
John C. Martin^1 and Roberta M. Humphreys^2
1. University of Illinois Springfield
2. University of Minnesota
We present the first four years of BVRI photometry from an on-going survey to annually monitor the photometric behavior of evolved luminous stars in M31 and M33. Photometry was measured for 199 stars at multiple epochs, including 9 classic Luminous Blue Variables (LBVs), 22 LBV candidates, 10 post-RGB A/F type hypergiants, and 18 B[e] supergiants. At all epochs the brightness is measured in V and at least one other band to a precision of 0.04 – 0.10 magnitudes down to a limiting magnitude of 19.0 – 19.5. Thirty three (33) stars in our survey exhibit significant variability, including at least two classic LBVs caught in S Doradus type outbursts. A hyper-linked version of the photometry catalog is at http://go.uis.edu/m31m33photcat.
Reference: To appear in the Astronomical Journal
Status: Manuscript has been accepted