Results 91 to 100 of about 7,252,313 (352)

The Open Cluster NGC 2437 (Messier 46)

, 2013
The stellar content of the open cluster NGC 2437 (Messier 46) is investigated using moderately deep u*,g', and r' MegaCam images. When compared with solar metallicity isochrones, the (g', u'-g') and (r', g'-r') CMDs are consistent with an age log(t_yr) =
Davidge, T. J.
core   +1 more source

NGC 4337: an over-looked old cluster in the inner disc of the Milky Way [PDF]

, 2014
Galactic open clusters do not survive long in the high density regions of the inner Galactic disc. Inside the solar ring only 11 open clusters are known with ages older than one Gyr.
Carraro, Giovanni, Costa, Edgardo, Giorgi, Edgard, Vazquez, Ruben A.   +3 more
core   +3 more sources

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

Red Clump stars in Kepler open cluster NGC 6819

EPJ Web of Conferences, 2015
We measure the large frequency separation, Δν, and the frequency of maximum amplitude, νmax, for 10 Red Clump (RC) single member (SM) stars in the Kepler open cluster NGC 6819. We derive luminosities and masses for each individual RC star.
Abedigamba O.P., Balona L.A., Medupe T.R.   +2 more
doaj   +1 more source

In Search of Possible Associations between Planetary Nebulae and Open Clusters

, 2007
We consider the possibility of cluster membership for 13 planetary nebulae that are located in close proximity to open clusters lying in their lines of sight.
Akhundova G. V., Andrews A. D., Barkhatova K. A., Bertelli G., Burki G., Cahn J. H., Cazetta J. O., Cuisinier F., Cutri R. M., Dambis A. K., Daniel J. Majaess, David G. Turner, David J. Lane, Glushkova E. V., Glushkova E. V., Hasegawa T., Jennens P. A., Kholopov P. N., Koester D., Kwok S., Mal'kov Y. F., Mallik D. C. V., Mermilliod J.-C., Mermilliod J.-C., Meynet G., Moffat A. F. J., Moitinho A., Neckel Th., Osterbrock D. E., Pena M., Peton-Jonas D., Svolopoulos S. N., Tifft W. G., Turner D. G., Tylenda R., Walker A. R., Weidemann V., Zijlstra A. A., Ziznovsky J.   +38 more
core   +1 more source

The anticenter old open cluster NGC 1883: radial velocity and metallicity [PDF]

, 2007
Having already reported on the first photometric study of the intermediate-age open cluster NGC 1883 (Carraro et al. 2003), we present in this paper the first spectroscopic multi-epoch investigation of a sample of evolved stars in the same cluster.
Baume, Gustavo, Carraro, Giovanni, Villanova, Sandro   +2 more
core   +3 more sources

Spectroscopic Study of the Open Cluster NGC 6811 [PDF]

, 2014
The NASA space telescope Kepler has provided unprecedented time-series observations which have revolutionised the field of asteroseismology, i.e. the use of stellar oscillations to probe the interior of stars.
J. Molenda–Żakowicz, K. Brogaard, E. Niemczura, M. Bergemann, A. Frasca, T. Arentoft, F. Grundahl   +6 more
semanticscholar   +1 more source

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

The age of the oldest Open Clusters

, 2003
We determine ages of 71 old Open Clusters by a two-step method: we use main-squence fitting to 10 selected clusters, in order to obtain their distances, and derive their ages from comparison with our own isochrones used before for Globular Clusters.
Percival, Susan M., Salaris, Maurizio, Weiss, Achim   +2 more
core   +1 more source

WIYN OPEN CLUSTER STUDY. LIX. RADIAL VELOCITY MEMBERSHIP OF THE EVOLVED POPULATION OF THE OLD OPEN CLUSTER NGC 6791 [PDF]

, 2014
The open cluster NGC 6791 has been the focus of much recent study due to its intriguing combination of old age and high metallicity (∼8 Gyr, [Fe/H] = +0.30), as well as its location within the Kepler field.
B. Tofflemire, N. Gosnell, R. Mathieu, I. Platais   +3 more
semanticscholar   +1 more source