Spectroscopy and deep photometry of PAL 3 and C0422-213

Details Spectroscopy and deep photometry of PAL 3 and C0422-213 Spectroscopy and deep photometry of PAL 3 and C0422-213

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...79..155o&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 79, no. 2, Aug. 1989, p. 155-187.

Astronomy and Astrophysics

Astrophysics

16

Astronomical Photometry, Astronomical Spectroscopy, Galactic Structure, Globular Clusters, Metallicity, Color-Magnitude Diagram, Galactic Evolution, Interstellar Extinction

Scientific paper

Deep CCD photometry for Pal 3 and C0422-213 confirm that the horizontal branches of these outer halo clusters are too red for their metal abundances. Apparent distance moduli (m - M)v of 19.81 + or - 0.07 for Pal 3 and 19.67 + or - 0.07 for C0422-213 are obtained. A turn off is found for both clusters which is just above the photometric limit for Pal 3. Ages are derived for the clusters (15 + or - 3 Gyr for C0422-213 and a lower limit of 12 Gyr for Pal 3) which are slightly lower than those found for classical globular clusters.

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