2006A&A...448..709S


Query : 2006A&A...448..709S

2006A&A...448..709S - Astronomy and Astrophysics, volume 448, 709-715 (2006/3-3)

Oscillation mode lifetimes in xi Hydrae: will strong mode damping limit asteroseismology of red giant stars?

STELLO D., KJELDSEN H., BEDDING T.R. and BUZASI D.

Abstract (from CDS):

We introduce a new method to measure frequency separations and mode lifetimes of stochastically excited and damped oscillations, so-called solar-like oscillations. Our method shows that velocity data of the red giant star ξ Hya (Frandsen et al., 2002A&A...394L...5F) support a large frequency separation between modes of roughly 7µHz. We also conclude that the data are consistent with a mode lifetime of 2-days, which is so short relative to its pulsation period that none of the observed frequencies are unambiguous. Hence, we argue that the maximum asteroseismic output that can be obtained from these data is an average large frequency separation, the oscillation amplitude and the average mode lifetime. However, the significant discrepancy between the theoretical calculations of the mode lifetime (Houdek & Gough, 2002MNRAS.336L..65H) and our result based on the observations of ξ Hya, implies that red giant stars can help us better understand the damping and driving mechanisms of solar-like p-modes by convection.

Abstract Copyright:

Journal keyword(s): stars: individual: ξ Hya - stars: oscillations

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* R Dor AB* 04 36 45.59127 -62 04 37.7974 7.84 6.98 5.40 2.71 -0.44 M8III:e 327 0
2 * L02 Pup AB* 07 13 32.3185436236 -44 38 22.951891964 7.90 6.66 5.10 2.49 0.07 M5IIIe 209 0
3 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1829 0
4 V* SV Lyn LP* 08 03 39.9438604632 +36 20 41.549730540   8.43 7.04     M5III: 40 0
5 * ksi Hya ** 11 33 00.1150559 -31 51 27.443449 5.17 4.47 3.54 2.84 2.36 G7IIIb 247 0
6 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2247 0
7 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 976 1
8 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1220 0

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2022.12.08-07:24:51

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