Stellar and molecular radial velocities for six young open clusters

1988 ◽  
Vol 95 ◽  
pp. 1122 ◽  
Author(s):  
Tianxing Liu ◽  
Kenneth A. Janes ◽  
T. M. Bania ◽  
Randy L. Phelps
Keyword(s):  
Open Clusters ◽  
Radial Velocities

scholarly journals A Determination of Secular Parallaxes of Reference Stars from Relative Proper Motions of Open Clusters

1970 ◽  
Vol 7 ◽  
pp. 74-76
Author(s):  
A. N. Deutsch
Keyword(s):  
Systematic Errors ◽  
Open Clusters ◽  
Radial Velocities ◽  
Proper Motions ◽  
The Mean

The determination of secular parallaxes of stars is usually based on meridian observations of proper motions of bright stars, this introducing known systematic errors. The mean parallaxes of stars can be obtained by means of radial velocities which are known for the bright stars. The more perspective method, the reference of stars to galaxies, is not applicable at low galactic latitudes.

scholarly journals Stellar Spins in the Pleiades, Praesepe, and M35 Open Clusters

2021 ◽  
Vol 923 (1) ◽  
pp. 23
Author(s):  
Brian F. Healy ◽  
P. R. McCullough ◽  
Kevin C. Schlaufman
Keyword(s):  
Systematic Error ◽  
Open Clusters ◽  
Photometric Data ◽  
Radial Velocities ◽  
Proper Motions ◽  
Kinematics Analysis ◽  
Mean Velocity ◽  
Clockwise Direction ◽  
Single Cluster

Abstract We analyze spectroscopic and photometric data to determine the projected inclinations of stars in three open clusters: the Pleiades, Praesepe, and M35. We determine the sin i values of 42, 35, and 67 stars in each cluster, respectively, and from their distributions we find that isotropic spins and moderate alignment are both consistent with the Pleiades and Praesepe data. While it is difficult to distinguish between these scenarios for a single cluster, an ensemble of such distributions may facilitate a distinction. The M35 inclination distribution is most consistent with a superposition of isotropic and anisotropic spins, the source of which could be systematic error or a physical grouping of aligned stars. We also study internal cluster kinematics using radial velocities and proper motions. Our kinematics analysis reveals significant plane-of-sky rotation in Praesepe, with a mean velocity of 0.132 ± 0.022 km s−1 in a clockwise direction.

scholarly journals The OCCASO survey: presentation and radial velocities of 12 Milky Way open clusters

2016 ◽  
Vol 458 (3) ◽  
pp. 3150-3167 ◽  
Author(s):  
L. Casamiquela ◽  
R. Carrera ◽  
C. Jordi ◽  
L. Balaguer-Núñez ◽  
E. Pancino ◽  
...  
Keyword(s):  
Milky Way ◽  
Open Clusters ◽  
Radial Velocities

scholarly journals Commission 33. (Stellar Statistics.)

1936 ◽  
Vol 5 ◽  
pp. 343-344
Author(s):  
B. Lindblad ◽  
C. Schalén
Keyword(s):  
Open Clusters ◽  
Radial Velocities ◽  
General Assembly ◽  
Proper Motions ◽  
The Future ◽  
The Subject

A recommendation to the Union concerning the construction of certain tables was accepted.A discussion was opened on the subject of collaboration in the study of open clusters. An application to the General Assembly was passed for a recommendation as follows: “That the Union call attention to the important problems connected with the open clusters and determinations of proper motions, radial velocities, magnitudes and spectra along the lines already inaugurated at several observatories.”It was agreed that Dr Mineur should approach the observatories of the Carte du Ciel on the subject of photographing the open clusters for the future determinations of proper motions.

Radial Velocities Without Spectroscopy

1999 ◽  
Vol 170 ◽  
pp. 77-81 ◽  
Author(s):  
Søren Madsen ◽  
Lennart Lindegren ◽  
Dainis Dravins
Keyword(s):  
Radial Velocity ◽  
Proper Motion ◽  
Open Clusters ◽  
Radial Velocities ◽  
Motion Data ◽  
Hipparcos Parallax

AbstractWe discuss non-spectroscopic (astrometric) ways to determine radial velocities and their potentials in future astrometric missions. Radial-velocity accuracies are presented, based on Hipparcos parallax and proper motion data for several open clusters.

scholarly journals Spectroscopic Radial Velocities: Photospheric Lineshifts Calibrated By Hipparcos

1998 ◽  
Vol 11 (1) ◽  
pp. 564-564
Author(s):  
D. Gullberg ◽  
D. Dravins
Keyword(s):  
Radial Velocity ◽  
High Precision ◽  
Open Clusters ◽  
Radial Velocities ◽  
Radial Motion ◽  
Spectral Lines ◽  
Gravitational Redshift ◽  
The Sun

Wavelengths of stellar spectral lines depend not only on the star’s motion. Until recently, accurate studies of shifts not caused by radial motion were feasible only for the Sun. Solar lineshifts are interpreted as gravitational redshift (636 m/s) and convective blueshifts (~ 400 m/s; caused by velocity-brightness correlations). In other stars, such effects may be greater (Dravins & Nordlund 1990). Accurate astrometric radial velocities are now available from Hipparcos (Dravins et al. 1997a; 1997b), permitting studies of such shifts also in some other stars. For such stars in the open clusters of Hyades, Ursa Major and Coma Berenices, a spectroscopic program is in progress, analyzing wavelength shifts in groups of lines with different strengths, excitation potentials, etc., using the ELODIE high-precision radial-velocity instrument (Baranne et al. 1996) at Haute-Provence Observatory.

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