J/A+A/540/A143 Oscillations of red giants observed by Kepler (Mosser+, 2012)
Probing the core structure and evolution of red giants using gravity-dominated mixed modes observed with Kepler. Mosser B., Goupil M.J., Belkacem K., Michel E., Stello D., Marques J.P., Elsworth Y., Barban C., Beck P.G., Bedding T.R., De Ridder J., Garcia R.A., Hekker S., Kallinger T., Samadi R., Stumpe M.C., Barclay T., Burke C.J. <Astron. Astrophys. 540, A143 (2012)> =2012A&A...540A.143M
ADC_Keywords: Stars, giant ; Spectroscopy Keywords: stars: oscillations - stars: interiors - stars: evolution - stars: late-type - methods: data analysis - asteroseismology Abstract: There are now more than 22 months of long-cadence data available for thousands of red giants observed with the Kepler space mission. Consequently, we are able to clearly resolve fine details in their oscillation spectra and see many components of the mixed modes that probe the stellar core. We report for the first time a parametric fit to the pattern of the l=1 mixed modes in red giants, which is a powerful tool to identify gravity-dominated mixed modes. With these modes, which share the characteristics of pressure and gravity modes, we are able to probe directly the helium core and the surrounding shell where hydrogen is burning. Description: Asymptotic mixed-modes parameters of the red giant oscillation spectra shown in the paper. Dnu is the large separation. numax indicates the central frequency of the oscillation power excess. DPi1 is the gravity period spacing, e_DPi1 its uncertainty, assuming that εg is fixed to 1/2. If Dpi1 changes too much along the mixed-mode spectrum, DPi1b gives the second possible value. q is the coupling factor, e_q its uncertainty. Mass and Rad are the asteroseismic estimates of the stellar mass and radius from scaling relations, using Teff from the Kepler Input Catalog (Brown et al. 2011, Cat. V/133). The division between RGB and clump stars is derived from Fig. 3; the limit between the primary and secondary clump stars is set at 1.8 solar mass. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 63 218 Characteristic parameters of the red giants
See also: V/133 : Kepler Input Catalog (Kepler Mission Team, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 I8 --- KIC Kepler Input Catalog number 10- 15 F6.3 uHz Dnu Large separation Δν in microHerz between consecutive radial orders 17- 21 F5.1 uHz numax Frequency of maximum oscillation signal 23- 28 F6.2 s DPi1 Gravity period spacing, ΔΠ1 30- 35 F6.2 s DPi1b ? Second possible value of gravity period spacing when DPi1 changes too much along the mixed-mode spectrum 37- 40 F4.2 s e_DPi1 ? rms uncertainty of DPi1 42- 45 F4.2 --- q [0/1] Coupling factor (1) 47- 50 F4.2 --- e_q rms uncertainty on q 52- 56 F5.2 Rsun Rad ?=0 Stellar radius in solar unit 58- 61 F4.2 Msun Mass ?=0 Stellar mass in solar unit 63 A1 --- ev Evolutionary status: C=red-clump, R=red-giant, S=secondary-clump.
Note (1): q=0 is equivalent to no coupling, and maximum coupling occurs for q=1.
Acknowledgements: Benoit Mosser, benoit.mosser(at)obspm.fr
(End) Benoit Mosser [Observatoire de Paris], Patricia Vannier [CDS] 12-Apr-2012
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