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

Detection of Solar-like oscillations in the G7 giant star Xi Hya

S. Frandsen, F. Carrier, C. Aerts, D. Stello, T. Maas, M. Burnet, H. Bruntt, T. C. Teixeira, J. R. de Medeiros, F. Bouchy, H. Kjeldsen, F. P. Pijpers, J. Christensen-Dalsgaard

We report the firm discovery of solar-like oscillations in a giant star. We monitored the star Xi Hya (G7III) continuously during one month with the CORALIE spectrograph attached to the 1.2 m Swiss Euler telescope. The 433 high-precision radial-velocity measurements clearly reveal multiple oscillation frequencies in the range 50-130 muHz, corresponding to periods between 2.0 and 5.5 hours. The amplitudes of the strongest modes are slightly smaller than 2 ms. Current model calculations are compatible with the detected modes. Based on observations obtained with the CORALIE spectrograph on the 1.2-m Swiss Euler telescope at La Silla, Chile.

Astronomy and Astrophysics
Volume 394, Page L5
October 2002

>> 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