• Publications
  • Influence
The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
National Science Foundation [AST-1109178, AST-1616636]; Gemini Observatory; Spanish Ministry of Economy and Competitiveness [AYA-2011-27754]; NASA [NNX12AE17G]; Hungarian Academy of Sciences;Expand
Weakened magnetic braking as the origin of anomalously rapid rotation in old field stars
TLDR
Stellar evolutionary modelling is reported, and the presence of unexpectedly rapid rotation in stars that are more evolved than the Sun is confirmed, suggesting a fundamental change in the nature of ageing stellar dynamos. Expand
Accurate fundamental parameters and detailed abundance patterns from spectroscopy of 93 solar-type Kepler targets
We present a detailed spectroscopic study of 93 solar-type stars that are targets of the NASA/Kepler mission and provide detailed chemical composition of each target. We find that the overallExpand
The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in 2014 July. It pursues three core programs: the Apache Point Observatory Galactic Evolution Experiment 2Expand
Sounding Open Clusters: Asteroseismic Constraints from Kepler on the Properties of NGC 6791 and NGC 6819
We present initial results on some of the properties of open clusters NGC 6791 and NGC 6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating the mass,Expand
The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
This paper documents the sixteenth data release (DR16) from the Sloan Digital Sky Surveys; the fourth and penultimate from the fourth phase (SDSS-IV). This will be the first release of data from theExpand
CoRoT sounds the stars: p-mode parameters of Sun-like oscillations on HD 49933
Context. The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoTExpand
Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
TLDR
Observations of gravity-mode period spacings in red giants that permit a distinction between evolutionary stages to be made, using high-precision photometry obtained by the Kepler spacecraft to measure oscillations in several hundred red giants. Expand
Tracking Solar Gravity Modes: The Dynamics of the Solar Core
TLDR
Using data from the Global Oscillation at Low Frequency instrument, a periodic structure is detected in agreement with the period separation predicted by the theory for gravity dipole modes in the Sun. Expand
Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes
TLDR
An increasing rotation rate from the surface of the star to the stellar core in the interiors of red giants is reported using the rotational frequency splitting of recently detected ‘mixed modes’, which confirms the theoretical prediction of a steep gradient in the rotation profile towards the deep stellar interior. Expand
...
1
2
3
4
5
...