Search Results - "Pinsonneault, Marc H."
-
1
Confirmation of the Gaia DR2 Parallax Zero-point Offset Using Asteroseismology and Spectroscopy in the Kepler Field
Published in The Astrophysical journal (20-06-2019)“…We present an independent confirmation of the zero-point offset of Gaia Data Release 2 parallaxes using asteroseismic data of evolved stars in the Kepler…”
Get full text
Journal Article -
2
The SPOTS Models: A Grid of Theoretical Stellar Evolution Tracks and Isochrones for Testing the Effects of Starspots on Structure and Colors
Published in The Astrophysical journal (01-03-2020)“…One-dimensional stellar evolution models have been successful at representing the structure and evolution of stars in diverse astrophysical contexts, but…”
Get full text
Journal Article -
3
OLDER AND COLDER: THE IMPACT OF STARSPOTS ON PRE-MAIN-SEQUENCE STELLAR EVOLUTION
Published in The Astrophysical journal (10-07-2015)“…ABSTRACT We assess the impact of starspots on the evolution of late-type stars during the pre-main sequence (pre-MS) using a modified stellar evolution code…”
Get full text
Journal Article -
4
Rotation, inflation, and lithium in the Pleiades
Published in Monthly notices of the Royal Astronomical Society (01-06-2015)“…The rapidly rotating cool dwarfs of the Pleiades are rich in lithium relative to their slowly rotating counterparts. Motivated by observations of inflated…”
Get full text
Journal Article -
5
Forward Modeling of the Kepler Stellar Rotation Period Distribution: Interpreting Periods from Mixed and Biased Stellar Populations
Published in The Astrophysical journal (20-02-2019)“…Stellar surface rotation carries information about stellar parameters-particularly ages-and thus the large rotational data sets extracted from Kepler time…”
Get full text
Journal Article -
6
A TALE OF TWO ANOMALIES: DEPLETION, DISPERSION, AND THE CONNECTION BETWEEN THE STELLAR LITHIUM SPREAD AND INFLATED RADII ON THE PRE-MAIN SEQUENCE
Published in The Astrophysical journal (20-07-2014)“…We investigate lithium depletion in standard stellar models (SSMs) and main sequence (MS) open clusters, and explore the origin of the Li dispersion in young,…”
Get full text
Journal Article -
7
HOW GOOD A CLOCK IS ROTATION? THE STELLAR ROTATION-MASS-AGE RELATIONSHIP FOR OLD FIELD STARS
Published in The Astrophysical journal (10-01-2014)“…The rotation-mass-age relationship offers a promising avenue for measuring the ages of field stars, assuming the attendant uncertainties to this technique can…”
Get full text
Journal Article -
8
SPECTROSCOPIC DETERMINATION OF MASSES (AND IMPLIED AGES) FOR RED GIANTS
Published in The Astrophysical journal (01-06-2016)“…ABSTRACT The mass of a star is arguably its most fundamental parameter. For red giant stars, tracers luminous enough to be observed across the Galaxy, mass…”
Get full text
Journal Article -
9
Weakened magnetic braking as the origin of anomalously rapid rotation in old field stars
Published in Nature (London) (14-01-2016)“…The age of a young to middle-aged star can be determined from how quickly or slowly it rotates, but the relationship breaks down for old stars; models now show…”
Get full text
Journal Article -
10
ON LITHIUM-RICH RED GIANTS. I. ENGULFMENT OF SUBSTELLAR COMPANIONS
Published in The Astrophysical journal (01-10-2016)“…ABSTRACT A small fraction of red giants are known to be lithium (Li) rich, in contradiction with expectations from stellar evolutionary theory. A possible…”
Get full text
Journal Article -
11
Testing Angular Momentum Transport and Wind Loss in Intermediate-mass Core-helium Burning Stars
Published in The Astrophysical journal (01-12-2018)“…Stars between 2 and 3 M☉ rotate rapidly on the main sequence, and their rotation rates in the core-helium burning (secondary-clump) phase can therefore be used…”
Get full text
Journal Article -
12
Core-envelope Decoupling Drives Radial Shear Dynamos in Cool Stars
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract Differential rotation is thought to be responsible for the dynamo process in stars like our Sun, driving magnetic activity and starspots. We report…”
Get full text
Journal Article -
13
TESS Stellar Rotation up to 80 Days in the Southern Continuous Viewing Zone
Published in The Astrophysical journal (01-02-2024)“…Abstract The Transiting Exoplanet Survey Satellite (TESS) mission delivers time-series photometry for millions of stars across the sky, offering a probe into…”
Get full text
Journal Article -
14
Constraining Metallicity-dependent Mixing and Extra Mixing Using [C/N] in Alpha-rich Field Giants
Published in The Astrophysical journal (20-02-2019)“…Internal mixing on the giant branch is an important process which affects the evolution of stars and the chemical evolution of the galaxy. While several…”
Get full text
Journal Article -
15
The Origin of Weakened Magnetic Braking in Old Solar Analogs
Published in Astrophysical journal. Letters (01-07-2022)“…Abstract The rotation rates of main-sequence stars slow over time as they gradually lose angular momentum to their magnetized stellar winds. The rate of…”
Get full text
Journal Article -
16
Bayesian distances and extinctions for giants observed by Kepler and APOGEE
Published in Monthly notices of the Royal Astronomical Society (11-12-2014)“…We present a first determination of distances and extinctions for individual stars in the first release of the APOKASC catalogue, built from the joint efforts…”
Get full text
Journal Article -
17
Stellar Models are Reliable at Low Metallicity: An Asteroseismic Age for the Ancient Very Metal-poor Star KIC 8144907
Published in The Astrophysical journal (01-11-2024)“…Abstract Very-metal-poor stars ([Fe/H] < −2) are important laboratories for testing stellar models and reconstructing the formation history of our galaxy…”
Get full text
Journal Article -
18
The APO-K2 Catalog. II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way
Published in The Astronomical journal (01-05-2024)“…Abstract We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology…”
Get full text
Journal Article -
19
Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis
Published in The Astronomical journal (01-10-2023)“…Abstract The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M ⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean…”
Get full text
Journal Article -
20
Galactic Globular and Open Clusters in the Sloan Digital Sky Survey. II. Test of Theoretical Stellar Isochrones
Published in The Astrophysical journal (20-07-2009)“…We perform an extensive test of theoretical stellar models for main-sequence (MS) stars in ugriz, using cluster fiducial sequences obtained in the previous…”
Get full text
Journal Article