2011A&A...529A..84B


Query : 2011A&A...529A..84B

2011A&A...529A..84B - Astronomy and Astrophysics, volume 529A, 84-84 (2011/5-1)

Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars.

BAUDIN F., BARBAN C., BELKACEM K., HEKKER S., MOREL T., SAMADI R., BENOMAR O., GOUPIL M.-J., CARRIER F., BALLOT J., DEHEUVELS S., DE RIDDER J., HATZES A.P., KALLINGER T. and WEISS W.W.

Abstract (from CDS):

The advent of space-borne missions such as CoRoT or Kepler providing photometric data has brought new possibilities for asteroseismology across the H-R diagram. Solar-like oscillations are now observed in many stars, including red giants and main-sequence stars. Based on several hundred identified pulsating red giants, we aim to characterize their oscillation amplitudes and widths. These observables are compared with those of main-sequence stars in order to test trends and scaling laws for these parameters for main-sequence stars and red giants. An automated fitting procedure is used to analyze several hundred Fourier spectra. For each star, a modeled spectrum is fitted to the observed oscillation spectrum, and mode parameters are derived. Amplitudes and widths of red-giant solar-like oscillations are estimated for several hundred modes of oscillation. Amplitudes are relatively high (several hundred ppm) and widths relatively small (very few tenths of a µHz). Widths measured in main-sequence stars show a different variation with the effective temperature from red giants. A single scaling law is derived for mode amplitudes of red giants and main-sequence stars versus their luminosity to mass ratio. However, our results suggest that two regimes may also be compatible with the observations.

Abstract Copyright:

Journal keyword(s): asteroseismology - methods: data analysis - stars: oscillations

Errata: + corrigendum vol. 535 p. C1

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 49385A PM* 06 48 11.5030769640 +00 18 17.894873196   7.952 7.399 8.28   G0V 87 1
2 HD 49933 PM* 06 50 49.8309774552 -00 32 27.167495244   6.147 5.771 7.04   F3V 379 2
3 HD 52265 PM* 07 00 18.0357115416 -05 22 01.780929120   6.845 6.282     G0V 328 1
4 HD 181420 PM* 19 20 27.0720449304 -01 18 35.132869692   6.98 6.55     F6V 88 0
5 HD 181907 RG* 19 22 21.5480809056 -00 15 08.508393504   6.906 5.811     K1III 62 0

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