2014ApJ...782...18M


Query : 2014ApJ...782...18M

2014ApJ...782...18M - Astrophys. J., 782, 18 (2014/February-2)

Measurement of acoustic glitches in solar-type stars from oscillation frequencies observed by Kepler.

MAZUMDAR A., MONTEIRO M.J.P.F.G., BALLOT J., ANTIA H.M., BASU S., HOUDEK G., MATHUR S., CUNHA M.S., SILVA AGUIRRE V., GARCIA R.A., SALABERT D., VERNER G.A., CHRISTENSEN-DALSGAARD J., METCALFE T.S., SANDERFER D.T., SEADER S.E., SMITH J.C. and CHAPLIN W.J.

Abstract (from CDS):

For the very best and brightest asteroseismic solar-type targets observed by Kepler, the frequency precision is sufficient to determine the acoustic depths of the surface convective layer and the helium ionization zone. Such sharp features inside the acoustic cavity of the star, which we call acoustic glitches, create small oscillatory deviations from the uniform spacing of frequencies in a sequence of oscillation modes with the same spherical harmonic degree. We use these oscillatory signals to determine the acoustic locations of such features in 19 solar-type stars observed by the Kepler mission. Four independent groups of researchers utilized the oscillation frequencies themselves, the second differences of the frequencies and the ratio of the small and large separation to locate the base of the convection zone and the second helium ionization zone. Despite the significantly different methods of analysis, good agreement was found between the results of these four groups, barring a few cases. These results also agree reasonably well with the locations of these layers in representative models of the stars. These results firmly establish the presence of the oscillatory signals in the asteroseismic data and the viability of several techniques to determine the location of acoustic glitches inside stars.

Abstract Copyright:

Journal keyword(s): stars: interiors - stars: oscillations

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 49933 PM* 06 50 49.8309774552 -00 32 27.167495244   6.147 5.771 7.04   F3V 361 2
2 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1822 0
3 HD 173701 PM* 18 44 35.1191008536 +43 49 59.790008892   8.37 7.52     G8V 150 0
4 HD 176153 Ro* 18 56 36.6514583496 +47 39 23.133492756   9.20 8.68     F9IV-V 71 0
5 HD 176693 Ro* 18 59 08.6844743448 +48 25 23.600359776   9.34 8.83     F8V 108 0
6 HD 177153 PM* 19 01 39.6780721176 +41 29 24.328113936   7.76 7.21     G0 99 0
7 BD+42 3247 PM* 19 06 58.3280630808 +42 26 08.260897020   10.32 9.75     G0.5IV 59 0
8 HD 179070 Ro* 19 09 26.8349590368 +38 42 50.455534860   8.767 8.25 8.00   F6IV 152 1
9 TYC 3550-300-1 * 19 09 55.5029520480 +49 15 04.351525056   11.69 10.95     G4-5IV-V 32 0
10 BD+39 3706 PM* 19 16 34.9026130056 +40 02 50.359631244       9.1   G1.5V 68 0
11 HD 234856 Ro* 19 17 45.8018919144 +50 28 48.274775580   9.87 9.32     F9IV-V 71 0
12 HD 181207 PM* 19 17 46.3565007888 +41 24 36.838219932   9.06 8.47     F9IV-V 77 0
13 BD+43 3221 * 19 20 47.9392965792 +44 09 18.751522032   10.03 9.50     F9IV-V 67 0
14 BD+48 2882 ** 19 21 24.640392 +48 30 53.31924   10.27 9.45 9.36   G1V 52 0
15 HD 181907 RG* 19 22 21.5480809056 -00 15 08.508393504   6.906 5.811     K1III 58 0
16 BD+41 3338 * 19 24 11.1933479232 +42 03 09.726975180   9.97 9.19     G8IV-V 63 0
17 HD 183298 PM* 19 26 22.0906256352 +50 59 14.334181836   8.71 8.16     G0.5IV 89 0
18 TYC 3551-149-1 PM* 19 27 20.4900952416 +48 57 12.010523580   10.59 9.85     G5IV 48 0
19 BD+44 3197 PM* 19 37 54.5252033200 +44 59 04.630621506       9.3   G0IV 66 0
20 HD 185834 * 19 39 00.6724153968 +46 54 06.984718740   9.26 8.78     F6IV 38 0
21 HD 187160 SB* 19 46 41.3411982432 +44 20 54.601189476   7.650 7.083     F9IV-V 88 0
22 BD+43 3368 * 19 48 14.2913289840 +43 44 48.961091040   9.63 9.17     F8V 41 0

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2022.07.06-19:34:18

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