Results 71 to 80 of about 134,869 (325)

Massive open star clusters using the VVV survey - II. Discovery of six clusters with Wolf-Rayet stars [PDF]

, 2012
Context. The ESO Public Survey “VISTA Variables in the Via Lactea” (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk.
A. Chen'e, J. Borissova, C. Bonatto, D. Majaess, G. Baume, J. Clarke, R. Kurtev, O. Schnurr, J. Bouret, M. Catelán, J. Emerson, C. Feinstein, D. Geisler, R. Grijs, A. Herv'e, V. Ivanov, M. Kumar, P. Lucas, L. Mahy, F. Martins, F. Mauro, D. Minniti, C. M. Bidin   +22 more
semanticscholar   +1 more source

A Photometric Method to Search for Be Stars in Open Clusters [PDF]

The Astrophysical Journal, 2005
We describe a technique to identify Be stars in open clusters using Stromgren b, y, and narrow-band Halpha photometry. We first identify the B-type stars of the cluster using a theoretical isochrone fit to the (b-y, y) color-magnitude diagram. The strongest Be stars are easily identified in a (b-y, y-Halpha) color-color diagram, but those with weaker ...
Douglas R. Gies, M. Virginia McSwain, M. Virginia McSwain   +2 more
openaire   +4 more sources

Social context prevents heat hormetic effects against mutagens during fish development

FEBS Letters, EarlyView.
This study shows that sublethal heat stress protects fish embryos against ultraviolet radiation, a concept known as ‘hormesis’. However, chemical stress transmission between fish embryos negates this protective effect. By providing evidence for the mechanistic molecular basis of heat stress hormesis and interindividual stress communication, this study ...
Lauric Feugere, Claudio Silva De Freitas, Adam Bates, Kenneth B. Storey, Pedro Beltran‐Alvarez, Katharina C. Wollenberg Valero   +5 more
wiley   +1 more source

Interaction vesicles as emerging mediators of host‐pathogen molecular crosstalk and their implications for infection dynamics

FEBS Letters, EarlyView.
Interaction extracellular vesicles (iEVs) are hybrid vesicles formed through host‐pathogen communication. They facilitate immune evasion, transfer pathogens' molecules, increase host cell uptake, and enhance virulence. This Perspective article illustrates the multifunctional roles of iEVs and highlights their emerging relevance in infection dynamics ...
Bruna Sabatke, Izadora Volpato Rossi, Marcel I. Ramirez   +2 more
wiley   +1 more source

Decoding the dual role of autophagy in cancer through transcriptional and epigenetic regulation

FEBS Letters, EarlyView.
Transcriptional and epigenetic regulation controls autophagy, which exerts context‐dependent effects on cancer: Autophagy suppresses tumorigenesis by maintaining cellular homeostasis or promotes tumor progression by supporting survival under stress. In this “In a Nutshell” article, we explore the intricate mechanisms of the dual function of autophagy ...
Young Suk Yu, Ik Soo Kim, Sung Hee Baek
wiley   +1 more source

An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21

The Astronomical Journal
Utilizing Gaia data from the literature, we report a new young (∼8.9 Myr) cluster pair, ASCC 19 and ASCC 21, located near the Orion star-forming complex. The clusters are separated by a 3D distance of 27.00 ± 7.51 pc.
Qingshun Hu, Yuting Li, Mingfeng Qin, Chenglong Lv, Yang Pan, Yangping Luo, Shuo Ma   +6 more
doaj   +1 more source

The occurrence of abnormal stars in open clusters [PDF]

The Astrophysical Journal, 1979
AbstractMorgan, Keenan, and others have found that low dispersions (80-130 Å mm-1) are ideal for obtaining spectral types and luminosity classes, especially for early-type stars. This is because at those dispersions certain blends are unresolved and remain useful, the hydrogen line wings are seen most clearly, and differences in rotational velocities ...
openaire   +3 more sources

Solar-like oscillations in open cluster stars [PDF]

Communications in Asteroseismology, 2007
Asteroseismology of stellar clusters is potentially a powerful tool. The assumption of a common age, distance, and chemical composition provides constraints on each cluster member, which significantly improves the asteroseismic output. Driven by this great potential, we carried out multi-site observations aimed at detecting solar-like oscillations in ...
Stello, Dennis, Bruntt, Hans, Arentoft, Torben, Gilliland, R.L., Nuspl, J., Kim, S.-L., Kang, Y.B., Koo, J.-R., Lee, J.-A., Lee, C.-U., Sterken, C., Jacob, A.P., Frandsen, Søren, Dind, Z.E., Jensen, H.R., Szabó, R., Csubry, Z., Kiss, L.L., Bouzid, M.Y., Dall, T.H., Bedding, T.R., Kjeldsen, Hans   +21 more
openaire   +4 more sources

A stepwise emergence of evolution in the RNA world

FEBS Letters, EarlyView.
How did biological evolution emerge from chemical reactions? This perspective proposes a gradual scenario of self‐organization among RNA molecules, where catalytic feedback on random mixtures plays the central role. Short oligomers cross‐ligate, and self‐assembly enables heritable variations. An event of template‐externalization marks the transition to
Philippe Nghe
wiley   +1 more source

A Systematic Analysis of Star Cluster Disruption by Tidal Shocks. II. Predicting Star Cluster Dissolution Rates from a Time-series Analysis of Their Tidal Histories

The Astrophysical Journal
Most of the dynamical mass loss from star clusters is thought to be caused by the time variability of the tidal field (“tidal shocks”). Systematic studies of tidal shocks have been hampered by the fact that each tidal history is unique, implying both a ...
Jeremy J. Webb, Marta Reina-Campos, J. M. Diederik Kruijssen   +2 more
doaj   +1 more source