Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1918p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Dec. 1988, p. 1918-1924. Research supported by the California Institute of Techn
Other
58
Globular Clusters, Stellar Color, Stellar Spectrophotometry, Balmer Series, Charge Coupled Devices, Color-Magnitude Diagram, Star Distribution
Scientific paper
The authors have developed a new technique for seeking color gradients in multicolor CCD images of a globular cluster. Application of this technique to M30 confirms the radial color gradient reported by others. The B-V and V-R colors show linear gradients, when plotted against log r, that are many times their statistical errors. In the radial range ≡3 - 100 arcsec, the B-V and V-R colors increase outwards by about (0.18±0.015) mag/dex and (0.09±0.01) mag/dex, respectively. Color-magnitude arrays of the central region show that the Balmer-line strength that accompanies the central blueness is due to an increased proportion of blue-horizontal-branch starlight in the center. This excess does not appear to be statistically significant in terms of star numbers, even though the color gradient is so highly significant.
Djorgovski Stanislav
King Ivan R.
Piotto Giampaolo
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