IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
First long-term activity analysis of southern dM stars
Autor/es:
IBAÑEZ BUSTOS, R.V.; BUCCINO, A P
Reunión:
Congreso; Second Binational Meeting AAA-SOCHIAS; 2018
Resumen:
Over the last decade, new interest in M dwarfs has emerged. They are prime targets for current and upcoming exoplanet searches and characterization efforts, due to their ubiquity in the solar neighborhood and high occurrence rates of small exoplanets in the habitable zone. However, these stars can be very active and their activity signatures can hinder the detection of orbiting planets. Furthermore, levels of UV radiation, which are strongly related to stellar activity, can also limit the habitability. Since 1999, the HKα Project is operating in the Argentinian observatory CASLEO (Complejo Astronómico El Leoncito). Our group, called FEEPA (Spanish acronym for Stellar Physics, Exoplanets and Astrobiology), systematically observe more than 150 main-sequence stars from F3 to M5.5. To date, we have more than 5000 mid-resolution spectra, ranging from 389 to 669 nm, which constitute an ideal dataset to study long-term activity. First, I show the first evidences of cyclic activity for the M1Ve star AU Microscopii and others early-M stars observed by our group. Then, I present preliminary analysis of activity for mid-M stars  that belong to the CONCH-SHELL catalog (e.g. PMI18498-2350).