Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986msngr..43...15a&link_type=abstract
The Messenger, vol. 43, p. 15-16
Astronomy and Astrophysics
Astrophysics
Scientific paper
Two "blue coated GEC CCOs" were recently made available for visiting astronomers at La Silla (The Messenger No. 41 and No. 42). We used the ESO CCO No. 7 to obtain UBV images of central regions of globular clusters at the Cassegrain focus of the 2.2-m La Silla telescope. The scientific aim was primarily to monitor the error box of the NGC 1851 X-ray source in quasi simultaneous observations with EXOSAT. This programme was carried out in collaboration with L. Koch-Miramond and J. M. Bonnet-Bidaud (C. E. N. Saclay) and J. P. Cordoni (Montpellier). The X-ray source associated with NGC 1851 is located just outside the core of the cluster (12 arcseconds north of the centre). Following our identification of the optical counterpart of the northern M15 X-ray source (1984, Astron. Astrophys. 138, 415; 1985, ESO preprint No. 400; lAU circular No. 4101 and No. 4146: AC211) we could expect to succeed again with one the most favourable targets of the southern hemisphere.
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