Results 141 to 150 of about 694,028 (301)
Lithium abundance in a volume limited sample of nearby main sequence G and K stars
, 2007 . We present observations of the Li I 6707.8 A line in a volume limited sample of main sequence stars of spectral types ranging from late F down to M0, selected from the Gliese catalog of nearby stars, discussing the behavior of lithium abundance along ...
S. Sciortino +3 more
core
Finding the unusual red giant remnants of cataclysmic variable mergers
The Open Journal of AstrophysicsMergers between helium white dwarfs and main-sequence stars are likely common, producing red giant-like remnants making up roughly a few percent of all low-mass ($\lesssim2M_\odot$) red giants.
Nicholas Z. Rui, Jim Fuller
doaj +1 more source
The chemical fingerprint of the Gaia BH3 system
Astronomy & AstrophysicsContext. The Gaia BH3 system hosts the most massive known stellar-origin black hole and a low-mass metal-poor companion whose chemical composition may help us constrain early explosive nucleosynthesis processes. Aims.
Vanden Broeck Grégory +7 more
doaj +1 more source
Synthesis of Bulk Superconducting LiNbO2 Crystals Through CaH2 Reduction
Advanced Materials, EarlyView.CaH2 reduction reconstructively transforms insulating LiNbO3 single crystals into superconducting bulk LiNbO2 with a critical temperature of Tc = 14.4 K. Scanning electron microscopy reveals large‐volume, high‐yield phase conversion. Magnetization measurements demonstrate a robust ∼ 77% Meissner shielding fraction, establishing bulk superconductivity ...
Ryan Paxson +19 more
wiley +1 more source
Emergence of a Lithium Dip in ∼35 Myr “Snake” Open Clusters
The Astrophysical Journal LettersWe report the discovery of a lithium dip (Li dip) in the stellar “Snake” (age = 35 ± 5 Myr), challenging the classical view that Li dips emerge only at ages ≳150 Myr.
Yun-Yi Zhang +4 more
doaj +1 more source
NGC 1647: A young open cluster with a broad main sequence observed with LAMOST
Astronomy & AstrophysicsAims. In this work we present the results of our analysis of medium-resolution LAMOST spectra of candidate members of the cluster NGC 1647 with the aim of determining the stellar parameters, activity level, lithium abundance, and to study the cluster ...
Frasca A. +6 more
doaj +1 more source
Advances in Bio‐Integrated Edge Computing Systems for Smart and Connected Health
Advanced Materials, EarlyView.This review explores advances in bio‐integrated edge computing for healthcare, focusing on co‐designing computing, sensing, and energy strategies to overcome integration and power challenges for optimized, decentralized operation. ABSTRACT Recent advances in bio‐integrated healthcare technologies have enabled continuous, high‐resolution monitoring and ...
Gyuwon Kim +4 more
wiley +1 more source
The Astronomical JournalWe measured lithium (Li) abundance and instantaneous chromospheric Ca ii HK activity in Hamilton Echelle Spectrograph observations of 211 solar analog field stars, with one objective being potential identification of grand minimum candidates for ongoing ...
Dan Lubin +4 more
doaj +1 more source
Dual Single Atoms Boosting Photocatalytic Upcycling of Raw Polyvinylidene Fluoride Plastic
Advanced Materials, EarlyView.To resolve the catastrophic disaster of plastic contamination, the Cu‐Fe dual‐single‐atom‐loaded In2P3S9 NSs photocatalyst was prepared for direct conversion of raw polyvinylidene fluoride plastic into valuable chemicals. The dual‐single‐atom catalyst exhibits exceptional performance, with a total acetic/formic acid production of ∼1351.8 µmol g−1 ...
Amin Talebian‐Kiakalaieh +6 more
wiley +1 more source
C3PO. V. Comoving Pairs Indicate Rotational Spin-down Drives the Main-sequence Li-Dip
The Astrophysical JournalThe lithium-dip observed in mid-F dwarfs remains a long-standing challenge for stellar evolution models. We present high-precision stellar parameters and A (Li) for 22 new comoving pairs, primarily located on the hotter side of the Li-Dip.
Qinghui Sun +5 more
doaj +1 more source