J/MNRAS/463/1297 Asteroseismology of 1523 misclassified red giants (Yu+, 2016)
Asteroseismology of 1523 misclassified red giants using Kepler data.
Yu J., Huber D., Bedding T.R., Stello D., Murphy S.J., Xiang M., Bi S.,
Li T.
<Mon. Not. R. Astron. Soc., 463, 1297-1306 (2016)>
=2016MNRAS.463.1297Y 2016MNRAS.463.1297Y (SIMBAD/NED BibCode)
ADC_Keywords: Asteroseismology ; Stars, giant
Keywords: techniques: photometric - stars: oscillations
Abstract:
We analysed solar-like oscillations in 1523 Kepler red giants which
have previously been misclassified as subgiants, with predicted
νmax values [based on the Kepler Input Catalogue (KIC)] between
280 and 700µHz. We report the discovery of 626 new oscillating red
giants in our sample, in addition to 897 oscillators that were
previously characterized by Hekker et al. from one quarter of Kepler
data. Our sample increases the known number of oscillating
low-luminosity red giants by 26 per cent (up to ≥1900 stars). About
three quarters of our sample are classified as ascending red giant
branch stars, while the remainder are red-clump stars. A novel scheme
was applied to determine Δν for 108 stars with νmax
close to the Nyquist frequency (387µHz>νmax>387µHz).
Additionally, we identified 47 stars oscillating in the super-Nyquist
frequency regime, up to 387 µHz, using long-cadence light curves.
We show that the misclassifications are most likely due to large
uncertainties in KIC surface gravities, and do not result from the
absence of broad-band colours or from different physical properties
such as reddening, spatial distribution, mass or metallicity. The
sample will be valuable to study oscillations in low-luminosity red
giants and to characterize planet candidates around those stars.
Description:
We selected 4758 stars with KIC predicted νmax ranging from close
to the Nyquist frequency (280uHz) to 700uHz. Based on the SYD pipeline
applied to the long-cadence light curves observed by Kepler , we
detected unambiguous oscillations in 1523 red giants and reported
the discovery of 626 new oscillating red giants.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 1523 Global oscillation parameters: νmax,
Δν and amplitude
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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3- 10 I8 --- KIC KIC number
14- 18 F5.1 uHz numax ?=- Maximum frequency
23- 26 F4.1 uHz e_numax ?=- rms uncertainty on numax
30- 34 F5.2 uHz dnu ?=- Mean large frequency separation
39- 42 F4.2 uHz e_dnu ?=- rms uncertainty on dnu
46- 50 F5.1 ppm Amp ?=- Amplitude per radial mode
55- 58 F4.1 ppm e_Amp ?=- rms uncertainty on Amp
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-May-2018