The determination of globular cluster ages using Stromgren photometry: NGC 6752

Details The determination of globular cluster ages using Stromgren photometry: NGC 6752 The determination of globular cluster ages using Stromgren photometry: NGC 6752

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..407f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 2, pp. 407-424.

Astronomy and Astrophysics

Astronomy

5

Techniques: Photometric, Stars: Fundamental Parameters, Globular Clusters: Individual: Ngc 6752

Scientific paper

Images of the Galactic globular cluster NGC 6752 have been obtained in the uvby filters of the Stromgren system using 1- and 4-m telescopes. A (V, b-y) colour-magnitude diagram and (m_1, b-y) and (c_1, b-y) colour-colour diagrams have been constructed. The high precision of the photometry leads to the (m_1, b-y), (c_1, b-y) and (V, b-y) sequences being well delineated down to V~=20 mag, some 2.5 mag below the turn-off. Thus, for the first time, the Strogren system can be used for an accurate determination of a cluster age. In principle, this method improves on use of BV observations for determining ages and metallicities. By comparing theoretical isochrones with the (c_1, b-y) diagram, we derive an age for this cluster of 16 Gyr with an internal accuracy of +/-1.5 Gyr, thus supporting the previous estimates of the age of this cluster. The age is reduced by ~2 Gyr if oxygen enhancement or alpha-element enhancement effects are included. From the (m_1, b-y) diagram we deduce a metallicity for the cluster in the range -1.7<[Fe/H]<-1.0 with a possible alpha-element enhancement of a factor of 3 over the scaled solar values. Main-sequence matching to the (V, b-y) diagram leads to an estimate of the distance modulus of 13.23+/-0.10.

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