2015A&A...579A..83C


Query : 2015A&A...579A..83C

2015A&A...579A..83C - Astronomy and Astrophysics, volume 579A, 83-83 (2015/7-1)

Bayesian peak bagging analysis of 19 low-mass low-luminosity red giants observed with Kepler.

CORSARO E., DE RIDDER J. and GARCIA R.A.

Abstract (from CDS):

Non-radial oscillations, observed in thousands of red giants by the space missions CoRoT and Kepler, allow us to greatly improve our understanding of stellar structure and evolution in cool low-mass stars. The currently available Kepler light curves contain an outstanding amount of information, but a detailed analysis of the individual oscillation modes in the observed power spectra, also known as peak bagging, is computationally demanding and challenging to perform on a large number of targets. Our intent is to perform for the first time a peak bagging analysis on a sample of 19 low-mass low-luminosity red giants observed by Kepler for more than four years. This allows us to provide high-quality asteroseismic measurements that can be exploited for an intensive testing of the physics used in stellar structure models, stellar evolution, and pulsation codes, as well as for refining existing asteroseismic scaling relations in the red giant branch regime. For this purpose, powerful and sophisticated analysis tools are needed. We exploit the Bayesian code Diamonds, using an efficient nested sampling Monte Carlo algorithm, to perform both a fast fitting of the individual oscillation modes and a peak detection test based on the Bayesian evidence. We find good agreement for the parameters estimated in the background fitting phase with those given in the literature. We extract and characterize a total of 1618 oscillation modes, providing the largest set of detailed asteroseismic mode measurements ever published. We report on the evidence of a change in regime observed in the relation between linewidths and effective temperatures of the stars occurring at the bottom of the red giant branch. We show the presence of a linewidth depression or plateau around νmax for all the red giants of the sample. Lastly, we show a good agreement between our measurements of maximum mode amplitudes and existing maximum amplitudes from global analyses provided in the literature, proving that amplitude scaling relations can be used as empirical tools to improve and simplify the future peak bagging analysis on a larger sample of evolved stars.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: evolution - methods: statistical - methods: numerical - methods: data analysis - stars: late-type

Errata: eeratum vol. 612, art. C2 (2018)

Simbad objects: 19

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Number of rows : 19
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 TYC 3130-1939-1 RG* 18 47 21.0832236624 +44 34 31.330213932   12.65 12.06     G6V 38 0
2 TYC 3544-900-1 RG* 18 54 48.6613876464 +47 08 16.322881452   13.41 11.44     ~ 29 0
3 UCAC4 687-065050 RG* 18 54 55.8950019264 +47 21 27.133919784   13.314 12.216 11.991   K1III 29 0
4 2MASS J19000746+4545325 RG* 19 00 07.4662254528 +45 45 32.505588612           K1IV 42 0
5 2MASS J19105863+4646538 RG* 19 10 58.6392294552 +46 46 53.811228432           G8IV-V 37 0
6 BD+45 2850 RG* 19 11 32.5344611016 +45 31 22.608120324   10.95 10.05     G8III 50 0
7 UCAC3 275-149696 RG* 19 14 43.1343391968 +47 16 57.041797260   13.02 12.12 11.90   G8IV-V 34 0
8 TYC 3550-257-1 RG* 19 16 23.1882620664 +50 25 37.850253564   13.53 11.94     K1III 26 0
9 TYC 3129-232-1 RG* 19 19 34.5940370112 +41 28 51.059967060   11.93 10.78     K2III 37 0
10 BD+38 3559 RG* 19 22 27.4541289912 +38 50 52.908872712   10.79 9.81     K2 45 0
11 UCAC4 702-065141 RG* 19 25 14.8454421288 +50 12 40.367289564   12.86 11.88 11.62   K3III 22 0
12 TYC 3146-611-1 RG* 19 28 19.0903164432 +44 19 18.595247268   13.35 11.71     G6V 53 0
13 2MASS J19332127+4908031 RG* 19 33 21.2759259096 +49 08 03.130778724           G5V: 37 0
14 2MASS J19370901+5021414 RG* 19 37 09.0140719560 +50 21 41.487343380           K1IV 35 0
15 TYC 3148-1558-1 RG* 19 41 18.4540709520 +43 14 07.193088312   12.55 11.61     K1IIe 36 0
16 KOI-5684 RG* 19 43 29.4965517528 +46 00 52.079984244   12.26 11.34     ~ 45 0
17 TYC 3144-592-1 RG* 19 49 36.5254311768 +41 24 14.228189280   12.22 11.22     ~ 40 0
18 TYC 3145-1523-1 RG* 19 54 32.8050168552 +42 34 47.329035348   13.226 12.214 11.862   K1IV 18 0
19 TYC 3162-767-1 RG* 20 03 39.4907791680 +44 49 04.483984512   12.11 11.10     ~ 40 0

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