Results 41 to 50 of about 94,786 (300)

The M dwarf problem: Fe and Ti abundances in a volume-limited sample of M dwarf stars [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT We report iron and titanium abundance measurements from high-resolution spectra in a volume-limited sample of 106 M0 and M0.5 dwarf stars. The sample includes stars north of the celestial equator and closer than 29 parsecs. The results imply that there is an M dwarf problem similar to the previously known G dwarf problem, in ...
Vincent M Woolf, George Wallerstein
openaire   +2 more sources

M dwarf stars in the light of (future) exoplanet searches

, 2012
We present a brief overview of a splinter session on M dwarf stars as planet hosts that was organized as part of the Cool Stars 17 conference. The session was devoted to reviewing our current knowledge of M dwarf stars and exoplanets in order to prepare ...
Bonfils, X., Gaidos, E., Helling, Ch., Henry, T. J., Hilton, E. J., Lépine, S., Mann, A. W., Rogers, L. A., Rojas-Ayala, B., von Braun, K., Youdin, A.   +10 more
core   +3 more sources

Detection of Young Massive White Dwarfs in Core-collapsed Globular Cluster NGC 362

The Astrophysical Journal Letters
Core-collapsed globular clusters are ideal targets to explore the presence of stellar collision products. Here, we have studied 17 far-UV bright white dwarf (WD) members in the globular cluster NGC 362 using data obtained from the Ultra Violet Imaging ...
R. K. S. Yadav, Arvind K. Dattatrey, Annapurni Subramaniam, Geeta Rangwal, Ravi S. Singh   +4 more
doaj   +1 more source

Stellar Characterization and Radius Inflation of Hyades M-dwarf Stars from the APOGEE Survey

The Astrophysical Journal, 2023
We present a spectroscopic analysis of a sample of 48 M-dwarf stars (0.2 M _⊙ < M < 0.6 M _⊙ ) from the Hyades open cluster using high-resolution H -band spectra from the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment ...
Fábio Wanderley, Katia Cunha, Diogo Souto, Verne V. Smith, Lyra Cao, Marc Pinsonneault, C. Allende Prieto, Kevin Covey, Thomas Masseron, Ilaria Pascucci, Keivan G. Stassun, Ryan Terrien, Galen J. Bergsten, Dmitry Bizyaev, José G. Fernández-Trincado, Henrik Jönsson, Sten Hasselquist, Jon A. Holtzman, Richard R. Lane, Suvrath Mahadevan, Steven R. Majewski, Dante Minniti, Kaike Pan, Javier Serna, Jennifer Sobeck, Guy S. Stringfellow   +25 more
doaj   +1 more source

The Carnegie Astrometric Planet Search Program

, 2009
We are undertaking an astrometric search for gas giant planets and brown dwarfs orbiting nearby low mass dwarf stars with the 2.5-m du Pont telescope at the Las Campanas Observatory in Chile.
Anglada-Escude, Guillem, Birk, Christoph, Boss, Alan P., Burley, Gregory, Gatewood, George D., Majewski, Steven R., Patterson, Richard J., Pravdo, Steven H., Shaklan, Stuart B., Thompson, Ian B., Weinberger, Alycia J.   +10 more
core   +1 more source

Why human connection is the true metric of research success

FEBS Open Bio, EarlyView.
Human‐centred mentorship can be shaped by mentor attributes, actions, intrinsic drive and career ambition. Drawing on reflections across Singapore and France, as well as workshop insights from FEBS‐IUBMB ENABLE 2024, this article shows that human‐centred mentorship creates the conditions for sustainable growth, well‐being and retention in research ...
Timothy Lin Yun Tan, Mattias Wei Ren Kon, Xavier Coumoul, Fun Man Fung   +3 more
wiley   +1 more source

Physical Parameters and Magnetic Activity of M-type Stars Based on the LAMOST DR9, SDSS, and TESS Surveys

The Astrophysical Journal Supplement Series
We analyze a catalog comprising 781,232 spectra from 641,095 M dwarf stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-resolution spectroscopic data release 9.
Wenjie Li, Li-yun Zhang, Tianhao Su, Xianming L. Han, Prabhakar Misra, Qingfeng Pi   +5 more
doaj   +1 more source

The California Planet Survey II. A Saturn-Mass Planet Orbiting the M Dwarf Gl649 [PDF]

, 2009
We report precise Doppler measurements of the nearby (d = 10.34 pc) M dwarf Gl649 that reveal the presence of a planet with a minimum mass Msini = 0.328 Mjup in an eccentric (e = 0.30), 598.3 day orbit.
Apps, Kevin, Bowler, Brendan P., Fischer, Debra A., Henry, Gregory W., Howard, Andrew W., Isaacson, Howard, Johnson, John Asher, Marcy, Geoffrey W., Wright, Jason T.   +8 more
core   +4 more sources

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

Overestimated Pressure Broadening Misleads Model Spectra in Cool M Dwarf Stars

The Astrophysical Journal Letters
Available one-dimensional stellar models fail to reproduce the observed spectrum of the ultracool M dwarf TRAPPIST-1. In particular, current models predict strong iron hydride (FeH) absorption due to the Wing–Ford bands at 0.99 μ m, yet this spectral ...
Ana Glidden, Veronika Witzke, Alexander I. Shapiro, Sara Seager   +3 more
doaj   +1 more source