2001A&A...378..142C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET09:26:43

2001A&A...378..142C - Astronomy and Astrophysics, volume 378, 142-145 (2001/10-4)

Solar-like oscillations in β Hydri: Confirmation of a stellar origin for the excess power.

CARRIER F., BOUCHY F., KIENZLE F., BEDDING T.R., KJELDSEN H., BUTLER R.P., BALDRY I.K., O'TOOLE S.J., TINNEY C.G. and MARCY G.W.

Abstract (from CDS):

The G2 subgiant β Hyi (HR 98) was observed with the Coralie fiber-fed echelle spectrograph on the 1.2-m Swiss telescope at La Silla in June 2000. The resulting 971 high-accuracy radial velocities exhibit an rms scatter of 2.72m/s and a mean noise level in the amplitude spectrum of 0.122m/s. These measurements show significant excess in the power spectrum between 0.7-1.4mHz with 0.40m/s peak amplitude. Fitting the asymptotic relation to the power spectrum gives a large splitting of 58µHz which is in good agreement with theoretical expectations. Our data confirm the independent detection of solar-like oscillations in β Hyi announced by Bedding et al. (2001ApJ...549L.105B) which used the Ucles echelle spectrograph on the 3.9-m Anglo-Australian Telescope. Two independent instruments and calibration methods obtained very similar power excesses thus leaving little doubts on the stellar origin of the detected signal.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: individual: β Hydri - techniques: radial velocities

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 552 0
2 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1765 0

    Equat.    Gal    SGal    Ecl

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2020.10.25-09:26:43

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