Multicolor photometry of the ZET Scl open cluster.

1978 ◽  
Vol 90 ◽  
pp. 81 ◽  
Author(s):  
C. L. Perry ◽  
D. K. Walter ◽  
D. L. Crawford
Keyword(s):  
Open Cluster ◽  
Multicolor Photometry

Multicolor photometry of the open cluster NGC 4755.

1976 ◽  
Vol 81 ◽  
pp. 632 ◽  
Author(s):  
C. L. Perry ◽  
C. B. Franklin ◽  
A. U. Landolt ◽  
D. L. Crawford
Keyword(s):  
Open Cluster ◽  
Multicolor Photometry

Open Cluster IC 1369 and Its Vicinity: Multicolor Photometry and Gaia DR2 Astrometry

2020 ◽  
Vol 159 (3) ◽  
pp. 95
Author(s):  
V. Straižys ◽  
R. P. Boyle ◽  
S. Raudeliūnas ◽  
J. Zdanavičius ◽  
R. Janusz ◽  
...  
Keyword(s):  
Open Cluster ◽  
Gaia Dr2 ◽  
Multicolor Photometry

Radial Velocities, Binarity, and Kinematic Membership in the Open Cluster NGC 2516

2000 ◽  
Vol 119 (5) ◽  
pp. 2296-2302 ◽  
Author(s):  
Jorge Federico González ◽  
Emilio Lapasset
Keyword(s):  
Open Cluster ◽  
Radial Velocities

scholarly journals Formation rate of LB-1-like systems through dynamical interactions

2020 ◽  
Vol 72 (3) ◽  
Author(s):  
Ataru Tanikawa ◽  
Tomoya Kinugawa ◽  
Jun Kumamoto ◽  
Michiko S Fujii
Keyword(s):  
Open Cluster ◽  
Formation Rate ◽  
Open Clusters ◽  
Type Star ◽  
Dynamical Mechanism ◽  
Milky Way Galaxy ◽  
Triple Systems ◽  
Stellar Collisions ◽  
Solar Metallicity ◽  
Helium Star

Abstract We estimate formation rates of LB-1-like systems through dynamical interactions in the framework of the theory of stellar evolution before the discovery of the LB-1 system. The LB-1 system contains a ∼70 ${M_{\odot}}$ black hole (BH), a so-called pair instability (PI) gap BH, and a B-type star with solar metallicity, and has nearly zero eccentricity. The most efficient formation mechanism is as follows. In an open cluster, a naked helium star (with ∼20 ${M_{\odot}}$) collides with a heavy main sequence star (with ∼50 ${M_{\odot}}$) which has a B-type companion. The collision results in a binary consisting of the collision product and the B-type star with a high eccentricity. The binary can be circularized through the dynamical tide with radiative damping of the collision product envelope. Finally, the collision product collapses to a PI-gap BH, avoiding pulsational pair instability and pair instability supernovae because its He core is as massive as the pre-colliding naked He star. We find that the number of LB-1-like systems in the Milky Way galaxy is ∼0.01(ρoc/104 ${M_{\odot}}$ pc−3), where ρoc is the initial mass densities of open clusters. If we take into account LB-1-like systems with O-type companion stars, the number increases to ∼0.03(ρoc/104 ${M_{\odot}}$ pc−3). This mechanism can form LB-1-like systems at least ten times more efficiently than the other mechanisms: captures of B-type stars by PI-gap BHs, stellar collisions between other types of stars, and stellar mergers in hierarchical triple systems. We conclude that no dynamical mechanism can explain the presence of the LB-1 system.

scholarly journals UOCS. IV. Discovery of diverse hot companions to blue stragglers in the old open cluster King 2

2021 ◽  
Vol 42 (2) ◽  
Author(s):  
Vikrant V. Jadhav ◽  
Sindhu Pandey ◽  
Annapurni Subramaniam ◽  
Ram Sagar
Keyword(s):  
Open Cluster ◽  
Blue Stragglers

scholarly journals Tidal Circularization Among the Close Binaries in M67

1992 ◽  
Vol 151 ◽  
pp. 471-472
Author(s):  
David W. Latham ◽  
Robert D. Mathieu ◽  
Alejandra A. E. Milone ◽  
Robert J. Davis
Keyword(s):  
Main Sequence ◽  
Open Cluster ◽  
Radial Velocities ◽  
Spectroscopic Binaries ◽  
Close Binaries ◽  
To Come ◽  
Mirror Telescope

In 1971 Roger Griffin and Jim Gunn began monitoring the radial velocities of most of the members brighter than the main-sequence turnoff in the old open cluster M67, primarily using the 200-inch Hale Telescope. In 1982 the torch was passed to Dave Latham and Bob Mathieu, who began monitoring many of the same stars with the 1.5-meter Tillinghast Reflector and the Multiple-Mirror Telescope on Mt. Hopkins. We have successively combined these two sets of data, plus some additional CORAVEL velocities kindly provided by Michel Mayor, to obtain 20 years of time coverage (e.g. Mathieu et al. 1986). Among the stars brighter than magnitude V = 12.7 we have already published orbits for 22 spectroscopic binaries (Mathieu et al. 1990). At Mt. Hopkins an extension of this survey to many of the cluster members down to magnitude V = 15.5 has already yielded thirteen additional orbital solutions, with the promise of many more to come.

scholarly journals WIYN Open Cluster Study. XVII. Astrometry and Membership toV=21 in NGC 188

2003 ◽  
Vol 126 (6) ◽  
pp. 2922-2935 ◽  
Author(s):  
Imants Platais ◽  
Vera Kozhurina-Platais ◽  
Robert D. Mathieu ◽  
Terrence M. Girard ◽  
William F. van Altena
Keyword(s):  
Open Cluster

scholarly journals Element abundances of unevolved stars in the open cluster M 67

2006 ◽  
Vol 450 (2) ◽  
pp. 557-567 ◽  
Author(s):  
S. Randich ◽  
P. Sestito ◽  
F. Primas ◽  
R. Pallavicini ◽  
L. Pasquini
Keyword(s):  
Open Cluster ◽  
Element Abundances

Studies on the open cluster M67

1993 ◽  
Vol 17 (2) ◽  
pp. 195-204 ◽  
Author(s):  
Tian Kai-ping ◽  
Zhao Jun-liang ◽  
Pan Rong-shi ◽  
He Yan-ping
Keyword(s):  
Open Cluster
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