Results 71 to 80 of about 563,854 (280)

Spitzer spectroscopy of circumstellar disks in the 5 Myr old upper Scorpius OB association [PDF]

, 2009
We present mid-infrared spectra between 5.2 and 38 μm for 26 disk-bearing members of the ~5 Myr old Upper Scorpius OB association obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. We find clear evidence for changes in the
Carpenter, John M., Dahm, S. E.
core   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

The Atlas of Massive Galactic O-type Spectral Standards (MaGOSS) in the Near-infrared

The Astrophysical Journal Supplement Series
Spectral morphological analysis is crucial for determining the fundamental physical properties of stars, particularly for rare and astrophysically important O-type stars.
F. N. Giudici Michilini, R. Gamen, G. Ferrero, N. Morrell, R. Barbá   +4 more
doaj   +1 more source

The Origin of Star Formation in Early-type Galaxies Inferred from Spatially Resolved Spectroscopy

The Astrophysical Journal, 2023
We investigate the origin of star formation activity in early-type galaxies with current star formation using spatially resolved spectroscopic data from the Mapping Nearby Galaxies at Apache Point Observatory in the Sloan Digital Sky Survey (SDSS).
Yun Hee Lee, Ho Seong Hwang, Narae Hwang, Jong Chul Lee, Ki-Beom Kim   +4 more
doaj   +1 more source

Low-metallicity massive single stars with rotation. II. Predicting spectra and spectral classes of chemically-homogeneously evolving stars

, 2019
Context. Metal-poor massive stars are supposed to be progenitors of certain supernovae, gamma-ray bursts and compact object mergers, potentially contributing to the early epochs of the Universe with their strong ionizing radiation.
Hainich, R., Hamann, W. -R., Kehrig, C., Krtička, J., Kubát, J., Kubátová, B., Sander, A. A. C., Shenar, T., Szécsi, D., Tramper, F.   +9 more
core   +1 more source

Early-type objects in NGC6611 and Eagle Nebula [PDF]

, 2008
An important question about Be stars is whether Be stars are born as Be stars or not. It is necessary to observe young clusters to answer this question. Observations of stars in NGC6611 and the star-formation region of Eagle Nebula have been carried out ...
A. M. Hubert, Alecian, Allen, Baade, Bastien, Belikov, Bertin, C. Martayan, C. Neiner, Castelli, Currie, D. Baade, de Winter, Duchêne, Dufton, Evans, Fabregat, Finkenzeller, Frémat, Herbig, Herbig, Hernández, Hillenbrand, Huang, Hubeny, Iben, Indebetouw, J. Fabregat, M. Floquet, Martayan, Martayan, Martayan, Meynet, Ogura, Palla, Pasquini, Porter, Santos, Schaller, Sicilia-Aguilar, The, Tucholke, Vieira, Walker, Y. Frémat, Zorec   +45 more
core   +5 more sources

Enteropathogenic E. coli shows delayed attachment and host response in human jejunum organoid‐derived monolayers compared to HeLa cells

FEBS Letters, EarlyView.
Enteropathogenic E. coli (EPEC) infects the human intestinal epithelium, resulting in severe illness and diarrhoea. In this study, we compared the infection of cancer‐derived cell lines with human organoid‐derived models of the small intestine. We observed a delayed in attachment, inflammation and cell death on primary cells, indicating that host ...
Mastura Neyazi, Pilar Samperio Ventayol, Natalie Burkard, Nicolas Schlegel, Carmen Aguilar, Sina Bartfeld   +5 more
wiley   +1 more source

A Catalog of Early-type Runaway Stars from LAMOST DR8

The Astrophysical Journal Supplement Series
Runaway stars are OB-type stars ejected from their birthplace with large peculiar velocities. The leading hypothesis addressed in their formation includes the supernova ejection mechanism and the dynamic ejection scenario.
Yanjun Guo, Luqian Wang, Chao Liu, You Wu, ZhanWen Han, XueFei Chen   +5 more
doaj   +1 more source

Stellar Properties of Observed Stars Stripped in Binaries in the Magellanic Clouds

The Astrophysical Journal, 2023
Massive stars (∼8–25 M _⊙ ) stripped of their hydrogen-rich envelopes via binary interaction are thought to be the main progenitors for merging neutron stars and stripped-envelope supernovae.
Y. Götberg, M. R. Drout, A. P. Ji, J. H. Groh, B. A. Ludwig, P. A. Crowther, N. Smith, A. de Koter, S. E. de Mink   +8 more
doaj   +1 more source

Detection of Low Mass-ratio Stellar Binary Systems

, 2012
O- and B-type stars are often found in binary systems, but the low binary mass-ratio regime is relatively unexplored due to observational difficulties.
Dodson-Robinson, Sarah, Gullikson, Kevin
core   +1 more source