The Chemical Inhomogeneity of M13

Details The Chemical Inhomogeneity of M13 The Chemical Inhomogeneity of M13

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..991f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 4/OCT15, P. 991, 1993

Astronomy and Astrophysics

Astronomy

7

Techniques: Photometric - Stars: Abundances - Hertzsprung-Russell (Hr) Diagram - Globular Clusters: Individual, M13

Scientific paper

Precise CCD photometry (with errors at the level of ±0.006 mag) of subgiants in M13 (NGC 6205) has been performed to give an estimate of the degree of chemical inhomogeneity amongst the stars in the cluster. The best estimate is that the spread in Δ[Fe/H] is zero, with a 1 σ upper limit of 0.08 dex. From the V, V- R colour-magnitude diagram, the intrinsic V- R colour spread of 50 subgiants away from the mean locus is less than ±0.0052 mag, at the 1 σ level. Thus the process of star formation in the cluster must have been chemically very uniform. The paper includes a detailed description of the technique for high-precision photometry of stars in crowded fields.

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