Structure of the Core of Globular Clusters

Details Structure of the Core of Globular Clusters Structure of the Core of Globular Clusters

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..25...12a&link_type=abstract

The Messenger, No.25, P. 12, 1981

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

There are numerous astrophysical arguments to stimulate an observer who wishes to study the poorly known central parts of globular clusters. Two considerations are particularly exciting. The theories of dynamical evolution of these stellar systems systematically predict the development of a central singularity; now, if it exists, what is its physical counterpart? In the observational field, we know that at least 15 globular cluster cores are associated with X-ray sources. Such phenomena occur preferentially in concentrated globular clusters. High spatial resolution is needed to disentangle individual stars in the central overcrowded fields. We are currently observing several concentrated globular clusters at Pic-du-Midi Observatory where excellent seeing is not rare. The splendid observations reported at La Silla with the 1.5 m Danish telescope (THE MESSENGER No. 17, p. 14) show that this instrument in its site may be very effective for such research. At any rate, the southern sky is particularly suited for globular cluster studies: it contains more than 100 from the about 140 known galactic globular clusters. Many objects of great interest, as 47 Tuc, the core of which is shown in Fig. 1, are invisible from France.

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