Results 1 to 10 of about 463,843 (173)

Rotation of Horizontal Branch Stars in Globular Clusters [PDF]

, 1999
The rotation of horizontal branch stars places important constraints on angular momentum evolution in evolved stars and therefore rotational mixing on the giant branch.
Pinsonneault, M., Sills, A.
core   +5 more sources

Can Planets Influence the Horizontal Branch Morphology? [PDF]

, 1998
As stars which have planetary systems evolve along the red giant branch and expand, they interact with the close planets. The planets deposit angular momentum and energy into the red giant stars' envelopes, both of which are likely to enhance mass loss ...
Balbus A. S., Bondi H., Ferraro F. R., Han Z., Harpaz A., Livio M., Noam Soker, Paczynski B., Walker A. R.   +8 more
core   +2 more sources

Blue Stragglers After the Main Sequence [PDF]

, 2008
We study the post-main sequence evolution of products of collisions between main sequence stars (blue stragglers), with particular interest paid to the horizontal branch and asymptotic giant branch phases.
Alison Sills, Amanda Karakas, Beccari, Charbonnel, Dearborn, Ferraro, Ferraro, Ferraro, Frost, Hansen, Hut, Iben, John Lattanzio, Lombardi, McCarthy, Monkman, Reimers, Sandquist, Schoenberner, Sills, Sills, Sills, Straniero   +22 more
core   +1 more source

Horizontal Branch A- and B-type Stars in Globular Clusters [PDF]

, 2004
Globular clusters offer ideal laboratories to test the predictions of stellar evolution. When doing so with spectroscopic analyses during the 1990s, however, the parameters we derived for hot horizontal branch stars deviated systematically from ...
Moehler, S.
core   +1 more source

Discovery of Blue Hook Stars in the Massive Globular Cluster M54

, 2003
We present BV photometry centered on the globular cluster M54 (NGC 6715). The color-magnitude diagram clearly shows a blue horizontal branch extending anomalously beyond the zero age horizontal branch theoretical models.
Alejandra Recio‐Blanco, Alfred Rosenberg, Bedin L. R., Busso G., Cassisi S., Macarena Garcia‐Marin, Moehler S., Sweigart A. V.   +7 more
core   +1 more source

RR Lyrae variables in Galactic globular clusters: IV. Synthetic HB and RR Lyrae predictions

, 2004
We present theoretical predictions concerning horizontal branch stars in globular clusters, including RR Lyrae variables, as derived from synthetic procedures collating evolutionary and pulsational constraints.
Alexander, Asplund, Benedict, Bono, Bono, Bono, Brocato, Brocato, Buzzoni, Caputo, Caputo, Caputo, Caputo, Caputo, Cassisi, Cassisi, Cassisi, Castellani, Castelli, Catelan, Dall'Ora, Demarque, F. Caputo, Ferraro, Harris, Iben, Iglesias, Kovács, Kraft, Krishna-Swamy, Lee, Longmore, Longmore, M. Castellani, Madore, Marconi, Mateo, Rood, S. Cassisi, Salaris, Sandquist, Straniero, V. Castellani, van den Bergh, Zoccali   +44 more
core   +2 more sources

Effects of tidally enhanced stellar wind on the horizontal branch morphology of globular clusters

, 2012
Metallicity is the first parameter to influence the horizontal branch (HB) morphology of globular clusters (GCs). It has been found, however, that some other parameters may also play an important role in affecting the morphology.
Chen, Xue-Fei, Han, Z., Lei, Zhen-Xin, Zhang, Feng-Hui   +3 more
core   +1 more source

Hot Horizontal Branch Stars: Predictions for Mass Loss [PDF]

, 2002
We predict mass-loss rates for the late evolutionary phases of low-mass stars, with special emphasis on the consequences for the morphology of the Horizontal Branch (HB).
Cassisi, Santi, Vink, Jorick S.
core   +2 more sources

The Stellar Populations of the Carina Dwarf Spheroidal Galaxy: I. a New Color-Magnitude Diagram for the Giant and Horizontal Branches

, 1994
We report on the first in a series of studies of the Carina dwarf spheroidal galaxy, a nearby satellite of our Galaxy. Our two major results are: 1) precise BI photometry ($\sigma_{B-I} \simlt 0.05$ for $V \simlt 22$) for 11,489 stars in the Carina field,
Hesser, J. E., Lehnert, M. D., Smecker-Hane, T. A., Stetson, P. B.   +3 more
core   +1 more source

Evolution of Hard X-Ray Spectra Along the Branches in Cir X-1

, 2003
Using the data from the PCA and HEXTE on board the RXTE satellite, we investigate the evolution of the 3-200 keV spectra of the peculiar low mass X-ray binary (LMXB) Cir X-1 along the branches on its hardness-intensity diagram (HID) from the vertical ...
Asai K., Brandt W. N., G. Q. Ding, Glass I. S., Hasinger G., J. L. Qu, Moneti A., Oosterbroek T., Protassov R. S., T. P. Li, Tennant A. F., Tennant A. F., Whelan J. A. J.   +12 more
core   +2 more sources