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J/MNRAS/446/2959 Asterosismology for solar analogues 16 Cyg A/B (Davies+, 2015)

Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni. Davies G.R., Chaplin W.J., Farr W.M., Garcia R.A., Lund M.N., Mathis S., Metcalfe T.S., Appourchaux T., Basu S., Benomar O., Campante T.L., Ceillier T., Elsworth Y., Handberg R., Salabert D., Stello D. <Mon. Not. R. Astron. Soc., 446, 2959-2966 (2015)> =2015MNRAS.446.2959D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Stars, double and multiple Keywords: planet-star interactions - stars: oscillations - stars: rotation Abstract: The solar analogues 16 Cyg A and B are excellent asteroseismic targets in the Kepler field of view and together with a red dwarf and a Jovian planet form an interesting system. For these more evolved Sun-like stars we cannot detect surface rotation with the current Kepler data but instead use the technique of asteroseimology to determine rotational properties of both 16 Cyg A and B. We find the rotation periods to be 23.81.5-1.8 and 23.211.5-3.2 d, and the angles of inclination to be 566-5 ° and 3617-7 °, for A and B, respectively. Together with these results we use the published mass and age to suggest that, under the assumption of a solar-like rotation profile, 16 Cyg A could be used when calibrating gyrochronology relations. In addition, we discuss the known 16 Cyg B star-planet eccentricity and measured low obliquity which is consistent with Kozai cycling and tidal theory. Description: Both 16 Cyg A and B are brighter (V∼6) than the saturation limit for which Kepler observations were designed. However, it was possible to capture the full stellar flux by using custom photometric aperture masks. Thus, 928 d of short-cadence observations (Gilliland et al. 2010ApJ...713L.160G) - from Quarter 7 to 16 - were generated using simple aperture photometry (Jenkins et al. 2010ApJ...713L..87J) and then corrected for instrumental perturbations following the methods described by Garcia et al. (2011MNRAS.414L...6G). The final light curves used for asteroseismic analyses were high-pass filtered using a triangular smooth of 4 d width and have a duty cycle of 90.5 per cent. The power density spectra were computed using a Lomb-Scargle algorithm. Objects: --------------------------------------------------------- RA (ICRS) DE Designation(s) --------------------------------------------------------- 19 41 49.09 +50 31 31.6 16 Cyg = IRAS 19404+5024 19 41 48.95 +50 31 30.2 16 Cyg A = KIC 12069424 19 41 51.97 +50 31 03.1 16 Cyg B = KIC 12069449 --------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tables1.dat 17 54 Mode frequencies for 16 Cyg A with 68% credible regions tables2.dat 17 56 Mode frequencies for 16 Cyg B with 68% credible regions
See also: J/ApJ/737/L32 : Abundances of 16 Cyg A and B (Schuler+, 2011) J/ApJ/790/L23 : Solar analogs and twins rotation by Kepler (Do Nascimento+, 2014) Byte-by-byte Description of file: tables1.dat tables2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- n [12/27] Radial order n 4 I1 --- l [0/3] The degree l of the mode 6- 12 F7.2 10-6Hz Freq Frequency 14- 17 F4.2 10-6Hz Region The 68% credible region
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 02-Nov-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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