A possible activity cycle in Proxima Centauri
نویسندگان
چکیده
منابع مشابه
Calculations of periodicity from Hα profiles of Proxima Centauri
In this report the stellar rotation signal for Proxima Centauri is investigated. High-resolution spectra taken with UVES and HARPS of Proxima Centauri over a 13-year period is used as well as photometric observations of Proxima Centauri from ASAS and HST. The Hα equivalent width and Hα index are measured (and found to be very similar), together with other measurements, skewness and kurtosis and...
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En este trabajo se aplica un modelo matemático de fotosíntesis para estimar la habitabilidad de un planeta hipotético orbitando Próxima del Centauro dentro de la zona de habitabilidad. Los resultados sugieren viabilidad apreciable para la productividad biológica, si los organismos presentes han evolucionado hasta desarrollar la capacidad de utilizar luz infrarroja para la fotosíntesis. We apply...
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The field of exoplanetary science has seen discovery rates increase dramatically over recent years, due largely to the data from the Kepler mission. Even so, individual discoveries of planets orbiting nearby stars are very important for studies of characterization and near-term follow-up prospects. The recent discovery of a terrestrial planet candidate orbiting Proxima Centauri presents numerou...
متن کاملThe moderate magnetic field on the flare star Proxima Centauri
We report moderate magnetic flux of 450 G< B f < 750 G (3σ) on the nearby M5.5 flare star Proxima Centauri. A high resolution UVES spectrum was used to measure magnetic flux from Zeeman broadening in absorption lines of molecular FeH around 1 μm. The magnetic flux we find is relatively weak compared with classical strong flare stars, but so are Proximas flaring rates and actual emission levels....
متن کاملA Detailed Study of Opacity in the Upper Atmosphere of Proxima Centauri
We present far-UV and UV spectroscopic observations of Proxima Centauri obtained as part of our continued investigation into the optically thin approximation assumed for the transition regions of late-type stars. Significant opacity is found in the C iii lines during both the quiescent and flaring states of Proxima Cen, with up to 70% of the expected flux being lost in the latter. Our findings ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066027