ASTEROSEISMOLOGY OF RED GIANTS FROM THE FIRST FOUR MONTHS OF KEPLER DATA: GLOBAL OSCILLATION PARAMETERS FOR 800 STARS

By D. Huber, T. Bedding, D. Stello, B. Mosser, S. Mathur, T. Kallinger, S. Hekker, Y. Elsworth, D. Buzasi, J. Ridder and 12 more. 2010

157 citations recorded by the source corpus.

We have studied solar-like oscillations in ∼800 red giant stars using Kepler long-cadence photometry. The sample includes stars ranging in evolution from the lower part of the red giant branch to the helium main sequence. We investigate the relation between the large frequency separation (Δν) and the frequency of maximum power (νmax) and show that it is different for red giants than for main-sequence stars, which is consistent with evolutionary models and scaling relations. The distributions of νmax and Δν are in qualitative agreement with a simple stellar population model of the Kepler field, including the first evidence for a secondary clump population characterized by M ≳ 2 M☉ and νmax ≃ 40–110 μHz. We measured the small frequency separations δν02 and δν01 in over 400 stars and δν03 in over 40. We present C-D diagrams for l = 1, 2, and 3 and show that the frequency separation ratios δν02/Δν and δν01/Δν have opposite trends as a function of Δν. The data show a narrowing of the l = 1 ridge toward lower νmax, in agreement with models predicting more efficient mode trapping in stars with higher luminosity. We investigate the offset ϵ in the asymptotic relation and find a clear correlation with Δν, demonstrating that it is related to fundamental stellar parameters. Finally, we present the first amplitude–νmax relation for Kepler red giants. We observe a lack of low-amplitude stars for νmax ≳ 110 μHz and find that, for a given νmax between 40 and 110 μHz, stars with lower Δν (and consequently higher mass) tend to show lower amplitudes than stars with higher Δν.

Subfields: Astronomy and Astrophysics, Education, Instrumentation

View Paper: https://www.semanticscholar.org/paper/5c482f0f51929efd85ba132bf8d87e3d7c0b1c5b

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. D. Huber
2. D. Stello
3. W. Chaplin
4. Jo Bovy
5. Hans-Walter Rix
6. B. Mosser
7. T. Bedding
8. A. Miglio

In Education

1. A. Serenelli
2. Martin Asplund
3. C. Allende Prieto
4. Jo Bovy
5. D. Huber
6. J. Holtzman
7. M. Shetrone
8. D. Nidever

In Instrumentation

1. D. Huber
2. D. Stello
3. W. Chaplin
4. B. Mosser
5. T. Bedding
6. A. Miglio
7. Y. Elsworth
8. Jo Bovy

Citations in the corpus

• Mixed modes in red-giant stars observed with CoRoT (2011, background): “A further consequence of the observation of ℓ = 2 mixed modes is a correction to the asymptotic laws reported for the small separationδν02 by Huber et al. (2010) and Mosser et al. (2011); they are correct, but only indicative of the barycenter of theℓ = 2 modes, if mixed.”
• Measuring the vertical age structure of the Galactic disc using asteroseismology and SAGA (2015, background): “For the sake of asteroseismic studies, entries in the KASC sample of giants (cf. with Section 2.2) are based on a number of heterogeneous criteria (Huber et al. 2010; Pinsonneault et al. 2014).”
• ASTEROSEISMIC CLASSIFICATION OF STELLAR POPULATIONS AMONG 13,000 RED GIANTS OBSERVED BY KEPLER (2013, background): “It was subsequently shown (Bedding et al. 2010; Huber et al. 2010; Mosser et al. 2011b) that the frequency spectra of the p modes in red giants are essentially similar under a simple scaling, which implies that the stars are largely homologous.”
• The connection between stellar granulation and oscillation as seen by the Kepler mission (2014, unknown): “…that show a clear power excess due to pulsation and which have already been used for other studies, such as the investigation of different seismic (Huber et al. 2010, 2011; Mosser et al. 2012a) and granulation (Mathur et al. 2011) observables, the seismic determination of fundamental parameters…”
• Asteroseismology of 16,000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii (2018, methodology): “The attenuation of oscillation amplitude due to the integration of photons for every long-cadence interval (29.4 minutes) has been corrected with a sinc function (Huber et al. 2010; Murphy 2012; Chaplin et al. 2014a).”
• PLATO as it is: a legacy mission for Galactic archaeology (2017, unknown): “…> 14 (as illustrated by Figures 3 and 4), where the detectability is hampered by the increasing noise level (and by the intrinsically low pulsational amplitudes, which decrease with decreasing luminosity—e.g., see Baudin et al. 2011; Huber et al. 2010; Kjeldsen & Bedding 1995; Samadi et al. 2012).”
• Spin down of the core rotation in red giants (2012, background): “Specific features of solar-like oscillations in red giants have been characterized (e.g. Bedding et al. 2010; Mosser et al. 2010; Huber et al. 2010).50 Mixed modes, which correspond to the coupling of gravity waves in the radiative core region and pressure waves in the envelope (Dziembowski et al.…”
• Characterization of the power excess of solar-like oscillations in red giants with Kepler (2011, background): “As already shown by Mosser et al. (2010) and Huber et al. (2010), we find a slightly higher exponent, of about 0.8 (Fig.”
• THE APOKASC CATALOG: AN ASTEROSEISMIC AND SPECTROSCOPIC JOINT SURVEY OF TARGETS IN THE KEPLER FIELDS (2014, result): “Huber et al. (2010) described how the basic seismic parameters were measured; Kallinger et al. (2010) provided the stellar parameters, such as mass and radius; and Hekker et al. (2011b) compared different analysis techniques.”
• CALCULATING ASTEROSEISMIC DIAGRAMS FOR SOLAR-LIKE OSCILLATIONS (2011, methodology): “This behavior of the model tracks is consistent with early results of red giants observed by Kepler (Bedding et al. 2010a; Huber et al. 2010) and the modeling results of Montalbán et al. (2010), for which it was found that δν02 is an almost fixed fraction of ∆ν.”
• FUNDAMENTAL PROPERTIES OF KEPLER PLANET-CANDIDATE HOST STARS USING ASTEROSEISMOLOGY (2013, unknown): “…of Kepler and CoRoT stars and by comparing derived radii and masses to evolutionary tracks and synthetic stellar populations (Hekker et al. 2009; Miglio et al. 2009; Kallinger et al. 2010a; Huber et al. 2010; Mosser et al. 2010; Huber et al. 2011; Silva Aguirre et al. 2011; Miglio et al. 2012b).”
• The universal red-giant oscillation pattern; an automated determination with CoRoT data (2010, methodology): “The new era of the spaceborne missions CoRoT andKepler has dramatically increased the amount and quality of the available asteroseismic data of red giants (Hekker et al. 2009; Bedding et al. 2010a; Mosser et al. 2010; Huber et al. 2010).”
• Asteroseismology of Solar-Type and Red-Giant Stars (2013, background): “…spectra found in evolved solar-like oscillators makes extraction of robust lists of identified modes and first-guess parameters non-trivial, although enough is known already about the pathology of the observed spectra to provide useful guidance (e.g., see Huber et al. 2010, Mosser et al. 2011b).”
• Probing the core structure and evolution of red giants using gravity-dominated mixed modes observed with Kepler (2012, methodology): “The data used are mainly Kepler long-cadence data that have been described in previous papers (e.g. 85 Jenkins et al. 2010; Bedding et al. 2010; Kallinger et al. 2010; Huber et al. 2010; Mathur et al. 2011b; Mosser et al. 2012, and references therein).”
• TESTING SCALING RELATIONS FOR SOLAR-LIKE OSCILLATIONS FROM THE MAIN SEQUENCE TO RED GIANTS USING KEPLER DATA (2011, methodology): “As first noted by Huber et al. (2010) and later confirmed by Mosser et al. (2011a), Mosser et al. (2011c) and Stello et al. (2011), this spread in the amplitudeνmax relation for red giants is related to a spread in mass.”
• A UNIFORM ASTEROSEISMIC ANALYSIS OF 22 SOLAR-TYPE STARS OBSERVED BY KEPLER (2012, result): “These relations have recently been tested for solar-type stars and red giants (Huber et al. 2010) and overall they appear to be in good agreement with the observations.”