Showing papers by "Isabella Pagano published in 2007"
TL;DR: In this paper, the results of the spectroscopic survey carried out to detect chromospheric activity of late-type stars in the fields of view of the CoRoT space mission are reported.
Abstract: Aims In this paper we report the results of the spectroscopic survey we carried out to detect chromospheric activity of late-type stars in the fields of view of the CoRoT space mission Methods We give an accurate MK classification of all targets, which is valuable information on both the main CoRoT project and additional science programs, by means of cross-correlation with MK standard stars, by using artificial neural networks The presence or absence of excess H α emission, determined using spectral subtraction technique, is used to characterize the chromospheric activity level Results In most cases our MK classification agrees with the spectral classification reported in the SIMBAD database; however, there are a few stars that are found to have very different MK classes Our survey reveals that ~7% of late-type stars in our sample indeed possess a very active chromosphere The measured H α excess and the presence of the 6708 A Li line allow us to confirm the membership of 5 targets in the young open cluster NGC 2264
7 citations
TL;DR: A pipeline, making use of IRAF, DAOPHOTII and tasks build up by us, is developed, which will enable to automatically extract differential magnitude time series, using both aperture and PSF photometry methods to build a proper sample of comparison stars.
Abstract: The huge amount of CCD photometric data collected by robotic telescopes (as for instance the ICE-T telescope to be installed at Dome-C) requires a fully automated approach to the reduction and analysis procedures. To this end, we are developing a pipeline, making use of IRAF, DAOPHOTII and tasks build up by us, which will enable to automatically extract differential magnitude time series. Both aperture and PSF photometry methods are used to build a proper sample of comparison stars, with the best method between the two being automatically selected. Finally, the search of rotational periods is performed. To test our package, we present results obtained using a 4-year dataset of a field in the Orion Nebula Cluster (ONC) containing about 350 stars (150 of which turned out to be periodic variables).
5 citations
TL;DR: In this article, the authors developed methods to model the optical variability of main-sequence late-type stars to understand the impact of solar-like activity on the detection of planetary transits and to improve the detection efficiency.
Abstract: Late-type MS stars display optical variability on different time scales due to the presence of photospheric brightness inhomogeneities produced by surface magnetic fields, analogous to cool spots and bright faculae observed in the Sun. We are developing methods to model the optical variability of main-sequence late-type stars to understand the impact of solar-like activity on the detection of planetary transits and to significantly improve the detection efficiency. Our techniques will also allow to map the longitude distribution of active regions on stars that harbor planets and to look for a possible connection between stellar activity and the presence of planets around a star.
3 citations
01 Jan 2007
TL;DR: The Field Camera Unit (FCU) as mentioned in this paper is one of the focal plane instruments aboard the WSO-UV telescope, a 1.7 m UV optimized instrument that will investigate numerous astrophysical phenomena from planetary science to cosmology.
Abstract: The Field Camera Unit (FCU) is one of the focal plane instruments aboard the WSO-UV telescope, a 1.7 m UV optimized instrument that will investigate numerous astrophysical phenomena from planetary science to cosmology. The FCU will perform deep UV and diffraction limited optical imaging in both wide and narrow band filters using three channels (FUV, NUV and UVO) optimized in different wavelength ranges and will have also spectropolarimetric capabilities. The total wavelength range covered by the instrument will go from 115 nm to 700 nm. The FCU instrument will be developed and realized by the italian scientific and industrial community. This paper will describe the scientific capabilities of the camera, its architecture and the expected performances.
1 citations
TL;DR: In this article, the authors proposed that, following the changes in the Divisional structure and renewal of the OC, the new members will be recruited to broaden the spectral range of research covered by the Division.
Abstract: Originally, Division XI concerned itself only with high-energy astrophysics (in particular UV, X-ray and gamma rays), to which was later added the domain of lower-energy astrophysics where observations are generally performed from space (optical, infrared, submillimeter and parts of the radio spectrum). The Division also includes ground-based high energy gamma ray and cosmic ray experiments, gravitational wave, and Moon-based astronomical observations. The individual expertise of the present OC reflects primarily the UV and higher energy domains. However, since there are plans within the IAU to restructure divisions, we propose that, following the changes in the Divisional structure and renewal of the OC, the new members will be recruited to broaden the spectral range of research covered by the Division.