Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie B, No. 37

Author(s): Gliese, W.
Title: The Correlation between Ultraviolet Excess and Deviation from the Mean Main-sequence
Source: Astron. Astrophys. 27, 429-431
Year: 1973
Abstract: For main-sequence stars with B-V>+0.45 an obvious correlation exists between the ultraviolet excess and the deviation from the mean (MV,B-V) relation. The question is wether or not absolute magnitudes determined from this colour-luminosity relation can be significantly improved by addition of a linear term DELTA M = b delta(U-B). Coefficient b proves to be dependent on the photoelectric system and, furthermore, it is very sensitive to the accidential errors in the colour observations. For the 35 M dwarfs with U, B, V measured by Johnson the addition of DELTA M to the colour-luminosity relation diminishes the subsequent dispersion of the deviations by about 60 per cent.
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