VLT/FLAMES observations of Collinder 261

CCD photometry of the old open cluster Collinder 261 ⋆

We present UBVI photometry for the old open cluster Collinder 261. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we derive in a self consistent way reddening, distance, and age of the cluster: E(B−V)=0.25−0.34, (m-M)0=11.7-12.0, and age=7−8 Gyr or 9−11 Gyr, depending on the adopted stellar tracks. The models in better agreement w...

High - resolution spectroscopy of the old open cluster Collinder 261 : abundances of Iron and other elements ⋆

We present the analysis of high resolution spectra of six red giant stars in the old open cluster Collinder 261. Reddening values for individual stars, derived from the relation between colours and temperatures (deduced from our fully spectroscopic analysis) are consistent with previous determinations based on photometry. For this cluster we derive an iron abundance of [Fe/H] = −0.03 ± 0.03. We...

261-267 Santelli

contraceptives. Demographic surveys of contraceptive use in the United States typically have collected and reported data only on use of single methods; when more than one method is described by a respondent, the one reported by the investigator is usually the method that most effectively prevents pregnancy.4 Likewise, studies of HIV and STD risk often do not include data on contraceptive use fo...

261-266 Landry/Forrest

(800,000), syphilis (101,000)2 and trichomoniasis (three million).3 For viral STDs, however, there is no cure; these include human papilloma virus (between 500,000 and one million cases annually), genital herpes (200,000–500,000), sexually transmitted hepatitis B (53,000) and the human immunodeficiency virus, or HIV (which is responsible for 90,000 cases of AIDS annually).4 STDs other than HIV ...

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