Faint stellar photometry in clusters. I - NGC 2204 and E3

Details Faint stellar photometry in clusters. I - NGC 2204 and E3 Faint stellar photometry in clusters. I - NGC 2204 and E3

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..270f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 270-285. Research supported by McDonald Observatory.

Astronomy and Astrophysics

Astrophysics

18

Electrophotometry, Star Clusters, Stellar Evolution, Stellar Luminosity, Stellar Spectrophotometry, Vidicons, Globular Clusters, Main Sequence Stars, Spectrum Analysis, Stellar Magnitude

Scientific paper

Photoelectric photometry of faint stars in the sparsely populated clusters NGC 2204 and E3 obtained with the CTIO SIT vidicon is presented and analyzed. Results indicate that the vidicon camera is linear over at least a 6 magnitude range and can provide magnitudes with an accuracy comparable to single channel photometry for all stars in the camera field simultaneously. Comparison of main-sequence photometry in the old disk cluster NGC 2204 down to Mv = 6.5 with theoretical isochrones of appropriate composition leads to an age of 2.2 to 2.8 billion years and distance modulus between 12.9 and 13.3 if reddening is assumed to be 0.08. The luminosity function of the cluster is flat over most of the main sequence. This result is consistent with previous data on NGC 2506 and NGC 2420 and suggests that the luminosity function at the faint end is dominated by tidal stripping. Attempts to calibrate the vidicon frames with the available photometry in the globular cluster E3 proved futile, apparently due to systematic error in the published B magnitudes. The claim for a significant population of blue stragglers in the cluster is confirmed.

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