Astrophysics
arXiv:astro-ph/0703747 (astro-ph)
[Submitted on 29 Mar 2007 (v1), last revised 15 May 2007 (this version, v2)]
Title:Solar-like oscillations in the G2 subgiant beta Hydri from dual-site observations
Authors:Timothy R. Bedding, Hans Kjeldsen, Torben Arentoft, Francois Bouchy, Jacob Brandbyge, Brendon J. Brewer, R. Paul Butler, Joergen Christensen-Dalsgaard, Thomas Dall, Soeren Frandsen, Christoffer Karoff, Laszlo L. Kiss, Mario J.P.F.G. Monteiro, Frank P. Pijpers, Teresa C. Teixeira, C. G. Tinney, Ivan K. Baldry, Fabien Carrier, Simon J. O'Toole
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Abstract: We have observed oscillations in the nearby G2 subgiant star beta Hyi using high-precision velocity observations obtained over more than a week with the HARPS and UCLES spectrographs. The oscillation frequencies show a regular comb structure, as expected for solar-like oscillations, but with several l=1 modes being strongly affected by avoided crossings. The data, combined with those we obtained five years earlier, allow us to identify 28 oscillation modes. By scaling the large frequency separation from the Sun, we measure the mean density of beta Hyi to an accuracy of 0.6%. The amplitudes of the oscillations are about 2.5 times solar and the mode lifetime is 2.3 d. A detailed comparison of the mixed l=1 modes with theoretical models should allow a precise estimate of the age of the star.
| Comments: | 13 pages, 14 figures, accepted by ApJ. Fixed minor typo (ref to Fig 14) |
| Subjects: | Astrophysics (astro-ph) |
| Cite as: | arXiv:astro-ph/0703747 |
| (or arXiv:astro-ph/0703747v2 for this version) | |
| https://doi.org/10.48550/arXiv.astro-ph/0703747
arXiv-issued DOI via DataCite
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| Journal reference: | Astrophys.J.663:1315-1324,2007 |
| Related DOI: | https://doi.org/10.1086/518593
DOI(s) linking to related resources
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Submission history
From: Tim Bedding [view email][v1] 2007年3月29日 04:36:50 UTC (292 KB)
[v2] 2007年5月15日 00:20:48 UTC (292 KB)
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