Further evidence for a color gradient in M15

Details Further evidence for a color gradient in M15 Further evidence for a color gradient in M15

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..480c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 480-487, 687.

Astronomy and Astrophysics

Astronomy

30

Globular Clusters, Star Distribution, Stellar Color, Stellar Evolution, Astronomical Photography, H Alpha Line, Seeing (Astronomy), Ubv Spectra

Scientific paper

Using data obtained at the Canada-France-Hawaii Telescope (CFHT) in subarcsecond seeing color maps are constructed in B - V and H-alpha - R of the central regions of the globular cluster M15. Comparison in B - V of the region within 0.31 pc of the cluster center with a coadded sample taken from the surrounding region demonstrates a color gradient, in the sense that the central region is bluer than the surrounding region at a high level of statistical significance. Analysis of the H-alpha - R color map indicates that the central region is 'H-alpha deficient', i.e., has a stronger H-alpha absorption line on average than the coadded region. This result argues against the possibility that the excess blue light from the central region is due to cataclysmic variables. Instead, two possible causes of the color gradient are (1) it may be due to a centrally concentrated population of faint blue stars, possibly resulting from binary-single star interactions, and (2) it may result from a central deficit of low-mass main-sequence stars.

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