sábado, 28 de novembro de 2015

Solar Analogs and HERMES spectrograph

HERMES Spectrograph at MERCATOR close to the heavens

Solar Analogs from KEPLER Mission observed with HERMES spectrograph  at MERCATOR Observatory  at Canary Islands, Spain.

Solar-analog stars provide an excellent opportunity to study the Sun’s evolution, i.e. the changes with time in stellar structure, activity, or rotation for solar-like stars. The unparalleled photo-metric data from the NASA space telescope Kepler allows us to study and characterize solar-like stars through asteroseismology. We aim to spectroscopically investigate the fundamental parameter and chromospheric activity of solar analogues and twins,based on observations obtained with the Hermes spectrograph and combine them with asteroseismology. Therefore, we need to build a solar atlas for the spectrograph, to provide accurate calibrations of the spectroscopically determined abundances of solar and late type stars observed with this instrument and thus perform differential spectral comparisons.We acquire high-resolution and high signal-to-noise (S/N) spectroscopy to construct three solar reference spectra by observing the reflected light of Vesta and Victoria asteroids and the Jovian moon Europa (100 < S/N < 450) with the Hermes spectrograph. This project is it a a long Term program with cooperation of the G3 from UFRN and with along the Hermes Solar Atlas we will analyse the microscopically   seismic solar analogues. Mercator - close to the heavens: The Mercator Telescope is a 1.2 m semi-robotic telescope located at the Roque de los Muchachos Observatory on La Palma Island (Canary Islands, Spain). It is operated by the staff of the Institute of Astronomy, University of Leuven(Belgium). The telescope's name comes from the famous Flemish cartographeres.

 Key Words: Minor planets, asteroids: individual: 4 Vesta; 12 Victoria−Planets and satellites: individual: Europa − stars: fundamental parameters; stars: solar-type −
Methods: observational; Techniques: spectroscopic.

Beck, P. G.; Allende Prieto, C.; Van Reeth, T.; Tkachenko, A.; Raskin, G.; van Winckel, H.; do Nascimento, J.-D., Jr.; Salabert, D.; Corsaro, E.; Garcia, R. A.

Publication Date:
Astrophysics - Solar and Stellar Astrophysics
12 pages, 8 figures, accepted for publication in A&A
Bibliographic Code: