scholarly journals The RR Lyrae variables in the globular cluster M68

1993 ◽  
Vol 412 ◽  
pp. 183 ◽  
Author(s):  
Christine M. Clement ◽  
Stephen Ferance ◽  
Norman R. Simon
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

On the mixed-mode RR lyrae variables in the globular cluster Ic 4499

1987 ◽  
pp. 230-232 ◽  
Author(s):  
Christine M Clement ◽  
James M Nemec ◽  
R J Dickens ◽  
Elizabeth A Bingham
Keyword(s):  
Globular Cluster ◽  
Mixed Mode ◽  
Rr Lyrae

scholarly journals A Century in Period Changes of the Variables in M15

1995 ◽  
Vol 155 ◽  
pp. 387-388
Author(s):  
Katalin Barlai ◽  
B. Szeidl
Keyword(s):  
Globular Cluster ◽  
Period Change ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars ◽  
Linear Period

AbstractPeriod behaviour of 62 RR Lyrae stars in the M15 globular cluster has been investigated. About one half of the sample (30 stars) exhibited linear period change. The remaining 32 variables can be characterized by abrupt or erratic changes in their periods.

scholarly journals CCD Observations of Variable Stars in Globular Clusters

1989 ◽  
Vol 111 ◽  
pp. 285-285
Author(s):  
H.A. Smith ◽  
J.R. Kuhn ◽  
J. Curtis
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
Variable Stars ◽  
Michigan State University ◽  
State University ◽  
Ccd Photometry ◽  
Rr Lyrae ◽  
Short Period ◽  
Ccd Observations ◽  
Period Variable

AbstractBVR observations of the relatively metal-rich globular cluster NGC 6388 have been obtained with a CCD on the CTIO 0.9 m telescope. Eighteen possible short period variable stars have been discovered in or near the cluster. At least 10 of these are probable RR Lyrae members of NGC 6388. We confirm the finding of Hazen and Hesser that this cluster is one of the most metal-rich to contain a significant number of RR Lyraes. A program of CCD photometry of field and cluster variable stars has been initiated on the 0.6m telescope of the Michigan State University Observatory.

M75, A Globular Cluster with a Trimodal Horizontal Branch. II.BVPhotometry of the RR Lyrae Variables

2003 ◽  
Vol 125 (5) ◽  
pp. 2543-2558 ◽  
Author(s):  
T. M. Corwin ◽  
M. Catelan ◽  
H. A. Smith ◽  
J. Borissova ◽  
F. R. Ferraro ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Horizontal Branch ◽  
Rr Lyrae

Double-Mode RR Lyrae Stars in the Globular Cluster M15

1995 ◽  
Vol 110 ◽  
pp. 1712 ◽  
Author(s):  
Patricia Purdue ◽  
N. A. Silbermann ◽  
Pamela Gay ◽  
Horace A. Smith
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars

The RR Lyrae stars in and around the LMC globular cluster NGC 2257

1985 ◽  
Vol 57 ◽  
pp. 287 ◽  
Author(s):  
J. M. Nemec ◽  
J. E. Hesser ◽  
P. P. Ugarte
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Lyrae Stars

scholarly journals The Influence of Rotation on Horizontal Branch Stars and on RR Lyrae Pulsational Properties

1981 ◽  
Vol 93 ◽  
pp. 275-275
Author(s):  
V. Castellani
Keyword(s):  
Globular Cluster ◽  
Main Sequence ◽  
Horizontal Branch ◽  
Structural Variations ◽  
Rr Lyrae ◽  
Horizontal Branch Stars ◽  
Mass Size ◽  
Red Giant

The occurrence of rotation in Globular Cluster stars has been suggested (see e.g. Renzini 1977) as a mechanism producing the observed colour spread in actual Horizontal Branches. If this is the case, canonical results on evolutionary properties of HB stars have to be revisited in order to account for rotation-driven structural variations: faster Main Sequence rotators delay the He flash increasing the mass-size Mc of the He core at the flash and loosing a greater amount of mass during the Red Giant stage.

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