Results 121 to 130 of about 47,514 (302)

Parallaxes, Proper Motions, and Near-infrared Photometry for 173 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program

The Astrophysical Journal
We present near-infrared parallax and proper motion astrometry for 74 L dwarfs and 99 T dwarfs, as single objects or in binary systems, obtained with the ASTROCAM astrometric imager on the USNO, Flagstaff Station 1.55 m telescope over two observing ...
Frederick J. Vrba, Adam C. Schneider, Jeffrey A. Munn, Arne A. Henden, Christain B. Luginbuhl, Conard C. Dahn, Harry H. Guetter, Blaise J. Canzian, Trudy M. Tilleman, Scott E. Dahm, Stephen J. Williams, Justice E. Bruursema, J. Davy Kirkpatrick, Adam J. Burgasser   +13 more
doaj   +1 more source

The MUCHFUSS photometric campaign

, 2018
Hot subdwarfs (sdO/Bs) are the helium-burning cores of red giants, which lost almost all of their hydrogen envelopes. This mass loss is often triggered by common envelope interactions with close stellar or even substellar companions. Cool companions like
Cordes, O., Geier, S., Gerber, R., Heber, U., Schaffenroth, V., Schneider, D., Ziegerer, E.   +6 more
core   +1 more source

Sustainable Development Goals' Discourse in the Accounting and Business Literature: A Rhetorical Lens

Business Strategy and the Environment, EarlyView.
ABSTRACT The role of academia in shaping the Sustainable Development Goals (SDGs) remains insufficiently understood. This study examines how SDG discourse is constructed within accounting and business research by integrating bibliometric analysis with a systematic review of 731 peer‐reviewed articles published between 2020 and 2024.
Silvia Panfilo, Ewelina Zarzycka, Chiara Mio   +2 more
wiley   +1 more source

Stellar Flare Study of nearby Young Moving Group Members with TESS Data

The Astrophysical Journal
We analyze TESS data to explore stellar flares and rotational characteristics in members of nearby young moving groups (NYMGs). Our study focuses on 417 members of NYMGs aged 10–150 Myr.
Andrew Tran, Inseok Song
doaj   +1 more source

Spectroscopy of Brown Dwarf Candidates in the rho Ophiuchi Molecular Core

, 1998
We present an analysis of low resolution infrared spectra for 20 brown dwarf candidates in the core of the $\rho$ Ophiuchi molecular cloud. Fifteen of the sources display absorption-line spectra characteristic of late-type stars.
Briceno C., Bruce A. Wilking, Calvet N., Casoli M., Comeron F., D'Antona F., Dent W. R. F., Hartmann L., Jones H. R. A., Kenyon S. J., Lynden-Bell D., Michael R. Meyer, Perrin G., Schiavon R. P., Thomas P. Greene   +14 more
core   +2 more sources

Market and Nonmarket Strategies in Focus: How Entrepreneurs Tackling the Grand Challenge of Waste Management Navigate Institutional and Market Adversity in Ghana

Business Strategy and the Environment, EarlyView.
ABSTRACT Waste management remains a critical grand challenge in African countries. While entrepreneurship has been a viable strategy for addressing this challenge, it is fraught with constraints. This study investigates the strategies orchestrated by entrepreneurs to navigate adversity in Waste management and ensure the social and economic viability of
Tahiru Azaaviele Liedong, Abiodun Samuel Adegbile, Augustine Awuah Peprah, Bede Akorige Atarah   +3 more
wiley   +1 more source

Metal Pipe: A Broadly Applicable Stellar Abundance Pipeline Using Isochronal Parameters

The Astrophysical Journal
Characterizing exoplanet host stars at the population level requires a method of homogeneously characterizing stellar properties across all spectral types.
Jared R. Kolecki, Lauren M. Weiss
doaj   +1 more source

CARMENES input catalogue of M dwarfs IV. New rotation periods from photometric time series

, 2018
Aims. The main goal of this work is to measure rotation periods of the M-type dwarf stars being observed by the CARMENES exoplanet survey to help distinguish radial-velocity signals produced by magnetic activity from those produced by exoplanets ...
Alonso, E. Diez, Amado, P. J., Bejar, V. J. S., Caballero, J. A., Cortes-Contreras, M., Dreizler, S., Dubois, F., Herrero, E., Hidalgo, D., Jeffers, S. V., Juez, F. J. de Cos, Kurster, M., Lalitha, S., Logie, L., Montes, D., Naves, R., Quirrenbach, A., Rau, S., Reiners, A., Ribas, I., Schofer, P., Seifert, W., Tal-Or, L., Vanaverbeke, S.   +23 more
core   +1 more source

Formalising Sustainability Management as a Core Process Group in Project Management

Business Strategy and the Environment, EarlyView.
ABSTRACT Sustainability has become a strategic imperative for organisations, yet widely used project management standards such as the PMBoK sixth and seventh editions still do not formalise how sustainability should be embedded across project work. This gap matters because PMBoK‐based processes shape governance, roles, documentation and performance ...
Cinzia Dessi, Vincenzo Basile, Federica Caboni, Flavio De Trane   +3 more
wiley   +1 more source

Chemical Fingerprints of M Dwarfs: High-resolution Spectroscopy on 31 M Dwarfs with SPIRou

The Astrophysical Journal
We extend the methodology introduced by F. Jahandar et al. to determine the effective temperature and chemical abundances of 31 slowly rotating solar neighborhood M dwarfs (M1–M5) using high-resolution spectra from CFHT/SPIRou.
Farbod Jahandar, René Doyon, Étienne Artigau, Neil J. Cook, Charles Cadieux, Jean-François Donati, Nicolas B. Cowan, Ryan Cloutier, Stefan Pelletier, Alan Alves-Brito, Jorge H. C. Martins, Hsien Shang, Andrés Carmona   +12 more
doaj   +1 more source