Photometric studies of Magellanic Cloud supergiants. I - Mean magnitudes and reddenings. II - Variability

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Interstellar Extinction, Magellanic Clouds, Stellar Magnitude, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Milky Way Galaxy, Stellar Color, Ubv Spectra

Scientific paper

In the first part of this paper, a combination of spectral types for 81 LMC and 46 SMC supergiants from the literature with new BVRI photometry yields reddenings and intrinsic colors for these stars. While reddenings up to E(B-V) of 0.3 are found for the LMC sample, the figure for the SMC appears to be no more than 0.2. The dust/gas ratio in both galaxies is found to be lower than in the Milky Way. In the second part, individual BVRI photoelectric observations for 88 LMC and 46 SMC intermediate spectral type supergiants are analyzed for variability. It is noted that 45 percent of the stars exhibit significant variations, with the incidence of variability decreasing with decreasing luminosity.

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