Results 51 to 60 of about 485,760 (336)

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

Network topology drives population temporal variability in experimental habitat networks

Population Ecology, EarlyView.
Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu, J. Angus Webb, William D. Bovill, Elise L. King   +3 more
wiley   +1 more source

Horizontal Branch Evolution and Atomic Diffusion

The Astrophysical Journal, 2007
Stellar evolution models of a 0.8 Msolar star (Y=0.2352, Z=0.0001, ?=0.3) have been calculated in detail from the zero-age main sequence to the horizontal branch, both with and without atomic diffusion. We analyze the effects of atomic diffusion on the horizontal branch models themselves, as well as on the properties of giant-branch tip stars that ...
Jacques Richer, Georges Michaud, Georges Michaud, Olivier Richard   +3 more
openaire   +3 more sources

Horizontal branch morphology: A new photometric parametrization [PDF]

Astronomy & Astrophysics, 2019
Context. Theory and observations indicate that the distribution of stars along the horizontal branch of Galactic globular clusters mainly depends on the metal content. However, the existence of globular clusters with similar metal content and absolute age but different horizontal branch morphologies, suggests the presence of another parameter affecting
Marianna Torelli, Marianna Torelli, Massimo Dall'Ora, Adriano Pietrinferni, Matteo Monelli, Matteo Monelli, Marco Castellani, I. Ferraro, Peter B. Stetson, Giuseppe Bono, Giuseppe Bono, G. Iannicola, Adriano Fontana, Maurizio Salaris   +13 more
openaire   +5 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

Infection Models for Pine Wilt Disease on the Basis of Vector Behaviors

Population Ecology, EarlyView.
Infection models for pine wilt disease without vector density were built to estimate the transmission coefficient of the pathogenic nematode. The models successfully simulated the annual change in the density of infected trees for four pine stands. ABSTRACT Pine wilt disease is caused by the pinewood nematode (Bursaphelenchus xylophilus Steiner et ...
Katsumi Togashi
wiley   +1 more source

Probing the Stellar Populations and Star Formation History of Early-type Galaxies at 0 < z < 1.1 in the Rest-frame Ultraviolet

The Astrophysical Journal
We measure the evolution of the rest-frame near-ultraviolet (NUV)− V colors for early-type galaxies in clusters at 0 < z < 1.1 using data from the Hyper Suprime-Cam Subaru Strategic Program, CFHT Large Area U -band Deep Survey, and local Sloan Digital ...
Sadman S. Ali, Roberto De Propris, Chul Chung, Steven Phillipps, Malcolm N. Bremer, Masato Onodera, Marcin Sawicki, Guillaume Desprez, Stephen Gwyn   +8 more
doaj   +1 more source

Metallicity of Globular Cluster M13 from VI CCD Photometry [PDF]

Journal of Astronomy and Space Sciences, 2000
From the VI images of M13, obtained by using 2K CCD camera and the BOAO 1.8m telescope, we derive the (V-I)-V CMD of M13. From the shapes of red giant branch, the magnitude of horizontal branch, and the giant branch bump on the constructed CMD, we ...
Young-Jong Sohn
doaj  

Hot subdwarf stars in close-up view - II. Rotational properties of single and wide binary subdwarf B stars

, 2012
Subluminous B stars (sdBs) form the extremely hot end of the horizontal branch and are therefore related to the blue horizontal branch (BHB) stars. While the rotational properties of BHB stars have been investigated extensively, studies of sdB stars have
Bear, Behr, Behr, Behr, Behr, Berger, Billères, Billères, Blanchette, Brown, Caloi, Carney, Carney, Charpinet, Charpinet, Charpinet, Charpinet, Charpinet, Copperwheat, de Marchi, Deca, Dorman, D’Cruz, Edelmann, Edelmann, Eisenstein, Fabbian, Fontaine, For, Geier, Geier, Geier, Geier, Geier, Geier, Geier, Gourgouliatos, Green, Green, Green, Grundahl, Han, Han, Han, Han, Heber, Heber, Heber, Heber, Hirsch, Iben, Jeffery, Kawaler, Kilkenny, Kilkenny, Kinman, Koen, Lemke, Lisker, Marietta, Maxted, Maxted, Mengel, Michaud, Michaud, Morales-Rueda, Napiwotzki, Napiwotzki, Napiwotzki, Napiwotzki, Napiwotzki, O’Donoghue, Pace, Peterson, Peterson, Peterson, Peterson, Politano, Przybilla, Quievy, Randall, Recio-Blanco, Recio-Blanco, S. Geier, Saffer, Sills, Silvotti, Soker, Ströer, Sweigart, Telting, U. Heber, Unglaub, van Grootel, van Grootel, Vink, Webbink, Østensen, Østensen   +98 more
core   +1 more source

Speciation Through the Lens of Population Dynamics: A Theoretical Primer on How Small and Large Populations Diverge

Population Ecology, EarlyView.
Population size and dynamics fundamentally shape speciation by influencing genetic drift, founder events, and adaptive potential. Small populations may speciate rapidly due to stronger drift, whereas large populations harbor more genetic diversity, which can alter divergence trajectories. We highlight theoretical models that incorporate population size
Ryo Yamaguchi, Hidaka Kubo, Tokuya Ogawa, Hayate Omura   +3 more
wiley   +1 more source