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In this work, we study the gravitational influence of the material extending from Uranus orbit to the Kuiper belt and beyond on objects moving within these regions. We conclude that a density distribution given by ρ (r)=(1)/(r) (for r >= 20 AU) generates a constant acceleration towards the Sun on those objects, which, with the proper amount of mass

We present the results of a spectroscopic analysis of bright stars in the Carina dSph galaxy. We collected low-resolution FORS2@VLT spectra of ≈ 200 stars. Our spectroscopic targets have been selected among the evolved Carina stars, in particular we selected low-mass, old Red Giant, Asymptotic, and Horizontal Branch stars, as well as intermediate

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Oxygen abundances of a large number of metal-rich stars, with and without known planets, were derived from the forbidden line [O I] 6300 Å, the OI 7771-5 Å triplet and from near-UV OH lines. Non-LTE corrections were calculated and applied to the LTE abundance results derived from the OI 7771-5 Å triplet. Spectral synthesis was performed for several

OO Serpentis is a deeply embedded young star which brightened by 5 mag in Kband between 1994 and 1995, and gradually faded afterwards. In many respects the star and its outburst is very similar to the well-known young eruptive stars (FUors and EXors). We monitored the eruption of OO Ser for 20 months with the Infrared Space Observatory in the 3.6