Results 51 to 60 of about 5,726,855 (364)

Astrometric and photometric study of the open cluster NGC 2323 [PDF]

Serbian Astronomical Journal, 2017
We present a study of the open cluster NGC 2323 using astrometric and photometric data. In our study we used two methods that are able to separate open cluster’s stars from those that belong to the stellar background. Our results of calculations
Amin M.Y., Elsanhoury W.H.
doaj   +1 more source

STELLAR RADIAL VELOCITIES IN THE OLD OPEN CLUSTER M67 (NGC 2682). I. MEMBERSHIPS, BINARIES, AND KINEMATICS [PDF]

, 2015
We present results from 13776 radial-velocity (RV) measurements of 1278 candidate members of the old (4 Gyr) open cluster M67 (NGC 2682). The measurements are the results of a long-term survey that includes data from seven telescopes with observations ...
A. Geller, D. Latham, R. Mathieu
semanticscholar   +1 more source

The Dynamics of Open Clusters [PDF]

Symposium - International Astronomical Union, 1987
Many of the “observations” of dark matter involve the application of the virial theorem or more sophisticated dynamical models to bound gravitational systems. Such studies often adopt a certain mass function and assume that the system is in a state near equipartition.
openaire   +1 more source

Hofstede`s model in the context of e-government and open government in EU countries: countries clustering based on similarities and differences

Smart Cities and Regional Development Journal, 2019
This research tries to answer the question “How does the Hofstede`s Model of societal cultural differences relate to the development of EU countries e-government and open government?”. This question of interest in the research comes from the growing
Hari Stankov NIKOLOV, Milena Yordanova KRUMOVA   +1 more
doaj   +1 more source

WIYN OPEN CLUSTER STUDY. XXXII. STELLAR RADIAL VELOCITIES IN THE OLD OPEN CLUSTER NGC 188 [PDF]

, 2015
We present the results of our ongoing radial-velocity (RV) survey of the old (7 Gyr) open cluster NGC 188. Our WIYN 3.5 m data set spans a time baseline of 11 years, a magnitude range of 12 ⩽ V ⩽ 16.5 (1.18–0.94 M☉), and a 1° diameter region on the sky ...
A. Geller, R. Mathieu, H. Harris, R. Mcclure   +3 more
semanticscholar   +1 more source

Seismic constraints on open clusters [PDF]

Astronomy & Astrophysics, 2005
We derive knowledge on the global and structural parameters of low-mass stars using asteroseismology and taking advantage of the stellar collective behavior within open clusters. We build stellar models and compute the seismic signal expected from main sequence objects in the 0.8-1.6 Msun range.
Piau, Laurent, Ballot, Jérôme, Turck-Chièze, Sylvaine   +2 more
openaire   +3 more sources

POLARIS (α UMi),- MULTISTELLAR SYSTEM IN THE OPEN CLUSTER

Odessa Astronomical Publications, 2007
We present the results of our analysis of high-resolution spectroscopic observations of Cepheid α UMi (Polaris A) and main-sequence type stars Polaris B and HD 5914, - optical companion and a member of Polaris open cluster. The last ones are objects with
I. A. Usenko, A. S. Miroshnichenko, V. G. Klochkova, V. E. Panchuk   +3 more
doaj   +1 more source

WIYN OPEN CLUSTER STUDY. XXXVI. SPECTROSCOPIC BINARY ORBITS IN NGC 188 [PDF]

, 2015
We present 98 spectroscopic binary orbits resulting from our ongoing radial velocity survey of the old (7 Gyr) open cluster NGC 188. All but 13 are high-probability cluster members based on both radial velocity and proper motion membership analyses ...
A. Geller, R. Mathieu, H. Harris, R. Mcclure   +3 more
semanticscholar   +1 more source

SPECTROSCOPIC ABUNDANCES IN THE OPEN CLUSTER NGC 6819 [PDF]

, 2015
High-dispersion spectra of 333 stars in the open cluster NGC 6819, obtained using the HYDRA spectrograph on the WIYN 3.5 m telescope, have been analyzed to determine the abundances of iron and other metals from lines in the 400 Å region surrounding the ...
Donald B. Lee-Brown, B. Anthony-Twarog, C. Deliyannis, Evan A. Rich, B. Twarog   +4 more
semanticscholar   +1 more source

Making tau amyloid models in vitro: a crucial and underestimated challenge

FEBS Letters, EarlyView.
This review highlights the challenges of producing in vitro amyloid assemblies of the tau protein. We review how accurately the existing protocols mimic tau deposits found in the brain of patients affected with tauopathies. We discuss the important properties that should be considered when forming amyloids and the benchmarks that should be used to ...
Julien Broc, Clara Piersson, Yann Fichou
wiley   +1 more source