Site Map
Follow us on Facebook Follow us on Twitter YouTube channel
Centro de Astrofísica da Universidade do Porto

Constructing a one-solar-mass evolutionary sequence using asteroseismic data from Kepler

V. Silva Aguirre, W. J. Chaplin, J. Ballot, S. Basu, T. R. Bedding, A. M. Serenelli, G. A. Verner, A. Miglio, M. J. P. F. G. Monteiro, A. Weiss, T. Appourchaux, A. Bonanno, A.-M. Broomhall, H. Bruntt, T. L. Campante, L. Casagrande, E. Corsaro, Y. Elsworth, R. A. García, P. Gaulme, R. Handberg, S. Hekker, D. Huber, C. Karoff, S. Mathur, B. Mosser, D. Salabert, R. Schönrich, S. G. Sousa, D. Stello, T. R. White, J. Christensen-Dalsgaard, R. L. Gilliland, S. D. Kawaler, H. Kjeldsen, G. Houdek, T. S. Metcalfe, J. Molenda-Żakowicz, M. J. Thompson, D. A. Caldwell, J. L. Christiansen, B. Wohler

Asteroseismology of solar-type stars has entered a new era of large surveys with the success of the NASA Kepler mission, which is providing exquisite data on oscillations of stars across the Hertzprung-Russell (HR) diagram. From the time-series photometry, the two seismic parameters that can be most readily extracted are the large frequency separation (Δν) and the frequency of maximum oscillation power (νmax). After the survey phase, these quantities are available for hundreds of solar-type stars. By scaling from solar values, we use these two asteroseismic observables to identify for the first time an evolutionary sequence of 1-M field stars, without the need for further information from stellar models. Comparison of our determinations with the few available spectroscopic results shows an excellent level of agreement. We discuss the potential of the method for differential analysis throughout the main-sequence evolution, and the possibility of detecting twins of very well-known stars.

asteroseismology - stars: evolution - stars: oscillations

The Astrophysical Journal Letters
Volume 740, Page L2_1
October 2011

>> PDF>> ADS>> DOI

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

Proceed on CAUP's website|Go to IA website