ASTEROSEISMIC CLASSIFICATION OF STELLAR POPULATIONS AMONG 13,000 RED GIANTS OBSERVED BY KEPLER

By D. Stello, D. Huber, T. Bedding, O. Benomar, L. Bildsten, Y. Elsworth, R. Gilliland, B. Mosser, B. Paxton, T. White. 2013

175 citations recorded by the source corpus.

Of the more than 150,000 targets followed by the Kepler Mission, about 10% were selected as red giants. Due to their high scientific value, in particular for Galaxy population studies and stellar structure and evolution, their Kepler light curves were made public in late 2011. More than 13,000 (over 85%) of these stars show intrinsic flux variability caused by solar-like oscillations making them ideal for large-scale asteroseismic investigations. We automatically extracted individual frequencies and measured the period spacings of the dipole modes in nearly every red giant. These measurements naturally classify the stars into various populations, such as the red giant branch, the low-mass (M/M☉ ≲ 1.8) helium-core-burning red clump, and the higher-mass (M/M☉ ≳ 1.8) secondary clump. The period spacings also reveal that a large fraction of the stars show rotationally induced frequency splittings. This sample of stars will undoubtedly provide an extremely valuable source for studying the stellar population in the direction of the Kepler field, in particular when combined with complementary spectroscopic surveys.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/10292b25a8144fa245f2c321cb5ad8d0fae59280

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. Hans-Walter Rix
3. Jo Bovy
4. D. Stello
5. W. Chaplin
6. Timothy C. Beers
7. I. Minchev
8. E. Gaidos

In Instrumentation

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

Citations in the corpus

• Measuring the vertical age structure of the Galactic disc using asteroseismology and SAGA (2015, methodology): “The SAGA asteroseismic catalogue consists of 989 stars identified by cross-matching our Strömgren observations with the dwarf sample of Chaplin et al. (2014) and the 15 000 giants from the Kepler Asteroseismic Science Consortium (KASC; Stello et al. 2013; Huber et al. 2014).”
• Rotation and magnetism of Kepler pulsating solar-like stars : Towards asteroseismically calibrated age-rotation relations (2014, background): “With the advent of the detection of mixed modes in subgiant and giant stars (e.g. Beck et al. 2011; Bedding et al. 2011; Mosser et al. 2011; Stello et al. 2013; Benomar et al. 2013, 2014) – including some belonging to a few clusters (Stello et al. 2011; Basu et al. 2011) – it is now possible to…”
• THE APOGEE RED-CLUMP CATALOG: PRECISE DISTANCES, VELOCITIES, AND HIGH-RESOLUTION ELEMENTAL ABUNDANCES OVER A LARGE AREA OF THE MILKY WAY'S DISK (2014, methodology): “We can estimate the contamination by applying the selection to those stars in the APOKASC catalog for which the evolutionary state was obtained by Stello et al. (2013) (which therefore provides the ground truth of whether a star is in the RC or not).”
• GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme (2013, background): “As demonstrated by Bedding et al. (2011) this separation can be achieved on the basis of measured period separations, which are now becoming available for large numbers of stars (Stello et al. 2013).”
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity (2014, background): “…not a concern since they have much shorter timescales, confirmed recently for red giants in large numbers via asteroseismology performed with Kepler data, such as in Bedding et al. (2010), Kallinger et al. (2012), or Stello et al. (2013); they manifest themselves as stellar jitter in our RV curves.”
• Red Clump Stars from LAMOST II: the outer disc of the Milky Way (2017, methodology): “In order to verify the separation line, Paper II overlaid the cross-matched RC stars from Stello et al. (2013), who used seismic period and frequency to accurately classify primary and secondary RC stars, and RGB stars.”
• Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2 (2018, background): “…presented here will thus aid in increasing cool dwarf samples for studies of stellar rotation and activity (e.g. McQuillan et al. 2014; Angus et al. 2016; Davenport 2016) and red giants for asteroseismology (e.g. Hekker et al. 2011; Mosser et al. 2012; Stello et al. 2013; Yu et al. 2018).”
• Mixed modes in red giants: a window on stellar evolution (2014, methodology): “This behavior is expected from stellar modeling, which however often fails at reproducing the mass corresponding to minimum ΔΠ1 values (e.g., Stello et al. 2013).”
• REVISED STELLAR PROPERTIES OF KEPLER TARGETS FOR THE QUARTER 1–16 TRANSIT DETECTION RUN (2013, background): “The new detections presented here raise the number of oscillating giant stars detected by Kepler by ∼ 20% over previous detections (Hekker et al. 2011; Stello et al. 2013) to a total of ∼ 15500 stars.”
• Red giant masses and ages derived from carbon and nitrogen abundances (2015, unknown): “…et al. 2010), and now K2 space missions, solar-like oscillations have been detected in thousands of red giants (e.g. De Ridder et al. 2009; Hekker et al. 2009, 2011; Bedding et al. 2010; Mosser et al. 2010; Stello et al. 2013, 2015), for stars up to 8 kpc from the Sun (Miglio et al. 2013a).”
• Asteroseismology of 16,000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii (2018, methodology): “For this we used the results from Bedding et al. (2011), Stello et al. (2013), Mosser et al. (2014), Vrard et al. (2016), Elsworth et al. (2017), and Hon et al. (2017).”
• THE APOKASC CATALOG: AN ASTEROSEISMIC AND SPECTROSCOPIC JOINT SURVEY OF TARGETS IN THE KEPLER FIELDS (2014, methodology): “Our automated methodology for evolutionary state classification is described in Stello et al. (2013) and summarized here.”
• THE IMPACT OF STELLAR MULTIPLICITY ON PLANETARY SYSTEMS. I. THE RUINOUS INFLUENCE OF CLOSE BINARY COMPANIONS (2016, background): “Input values and uncertainties for T g, logeff ( ), and [Fe/H] were taken from the Kepler stellar properties catalog except for 13 M dwarfs for which we adopted new temperatures and metallicities based on medium resolution spectra obtained with the SNIFS spectrograph following the method given in Ma”
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes (2017, methodology): “To separate RGB and red clump stars, we used classifications based on mixed mode period spacings by Stello et al. (2013) and Vrard et al. (2016).”
• They are small worlds after all: revised properties of Kepler M dwarf stars and their planets (2015, methodology): “To this we added 195 K and M giants that were selected as Kepler targets based on variability; Kepler observations of all of these stars confirmed the presence of giant-like radial and non-radial pulsations (Stello et al. 2013).”