Results 61 to 70 of about 508,501 (339)

Observations of Binary Stars with the Differential Speckle Survey Instrument. V. Toward an Empirical Metal-Poor Mass-Luminosity Relation [PDF]

, 2015
In an effort to better understand the details of the stellar structure and evolution of metal poor stars, the Gemini North telescope was used on two occasions to take speckle imaging data of a sample of known spectroscopic binary stars and other nearby ...
Ciardi, David R., Demarque, Pierre, Everett, Mark E., Henry, Todd J., Horch, Elliott P., Howell, Steve B., Teske, Johanna K., van Altena, William F., Winters, Jennifer G.   +8 more
core   +3 more sources

Triple Evolution: An Important Channel in the Formation of Type Ia Supernovae

The Astrophysical Journal, 2023
Type Ia supernovae (SNe Ia) are thought to be the result of thermonuclear explosions in white dwarfs (WDs). Commonly considered formation pathways include two merging WDs (the double-degenerate channel) and a single WD accreting material from a H or He ...
Abinaya Swaruba Rajamuthukumar, Adrian S. Hamers, Patrick Neunteufel, Rüdiger Pakmor, Selma E. de Mink   +4 more
doaj   +1 more source

An Adaptive Management Model for Brown Bears in Hokkaido: Based on Total Population and the Number of Nuisance Bears

Population Ecology, EarlyView.
Bear management changes management actions according to the horizontal axis of the population size and the vertical axis of the number of nuisance bears. Aiming for the target population size of Ntar, Actions I and II protect the bears, and Action IV reduces the population.
Hiroyuki Matsuda, Akira Maki, Tsutomu Mano, Hifumi Tsuruga, Hino Takafumi, Shinichi Horino   +5 more
wiley   +1 more source

Spiral arm crossings inferred from ridges in Gaia stellar velocity distributions

, 2018
The solar neighborhood contains disc stars that have recently crossed spiral arms in the Galaxy. We propose that boundaries in local velocity distributions separate stars that have recently crossed or been perturbed by a particular arm from those that ...
Anders, Friedrich, Carrillo, Ismael, Chiappini, Cristina, Hilmi, Tariq, Khalatyan, Arman, McMillan, Paul, Minchev, Ivan, Monari, Giacomo, Quillen, Alice C., Steinmetz, Matthias   +9 more
core   +1 more source

Massive stars in the giant molecular cloud G23.3−0.3 and W41 [PDF]

, 2014
Context. Young massive stars and stellar clusters continuously form in the Galactic disk, generating new Hii regions within their natal giant molecular clouds and subsequently enriching the interstellar medium via their winds and supernovae.Aims. Massive
Aharonian, Albert, Alvarez, Alves, Apellániz, Ben Davies, Bibby, Bica, Blommaert, Blum, Blum, Borissova, Brand, Brogan, Bronfman, Brunthaler, Carpenter, Carter, Christine Trombley, Churchwell, Clark, Clark, Clark, Clark, Clark, Crowther, Crowther, Dame, Dame, Davies, Davies, Davies, Davies, de Wit, Donald F. Figer, Drimmel, Egan, Ekström, Elias, Epchtein, Fariña, Figer, Figer, Figer, Figer, Figer, Garcia-Lario, Gogus, Grebel, Green, Groh, Gvaramadze, Göğüş, Habing, Hanson, Hanson, Helfand, Humphreys, Humphreys, Indebetouw, J. Simon Clark, John W. MacKenty, Johnson, Kargaltsev, Karl M. Menten, Kleinmann, Koornneef, Kuchar, Lada, Leahy, Lejeune, Levesque, Lucas, Maria Messineo, Martins, Martins, Martins, Mauerhan, Mercer, Messineo, Messineo, Messineo, Messineo, Messineo, Misanovic, Mori, Morris, Mukherjee, Muno, Nakashima, Nishiyama, Oliva, Price, R. Michael Rich, Rayner, Reid, Reunanen, Rieke, Rolf-Peter Kudritzki, Roman-Lopes, Roman-Lopes, Roman-Lopes, Rousselot, Salpeter, Shara, Skiff, Smith, Soto, Stead, Storey, Sylvester, Thackeray, Tian, Valentin D. Ivanov, Vollmann, Walborn, Walborn, Wegner, White, Whitney, Wright, Zacharias   +121 more
core   +2 more sources

Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210

The Astrophysical Journal, 2023
Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters ...
Chengyuan Li, Xin Ji, Long Wang, Yue Wang, Baitian Tang, Antonino P. Milone, Yujiao Yang, Holger Baumgardt, Dengkai Jiang   +8 more
doaj   +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

Multipopulation aftereffects on the color-magnitude diagram and Cepheid variables of young stellar systems

, 2013
Context: The evidence of a multipopulation scenario in Galactic globular clusters raises several questions about the formation and evolution of the two (or more) generations of stars.
Brocato, E., Carini, R., Marconi, M., Raimondo, G.   +3 more
core   +1 more source

FoxO1 signaling in B cell malignancies and its therapeutic targeting

FEBS Letters, EarlyView.
FoxO1 has context‐specific tumor suppressor or oncogenic character in myeloid and B cell malignancies. This includes tumor‐promoting properties such as stemness maintenance and DNA damage tolerance in acute leukemias, or regulation of cell proliferation and survival, or migration in mature B cell malignancies.
Krystof Hlavac, Petra Pavelkova, Laura Ondrisova, Marek Mraz   +3 more
wiley   +1 more source

Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars [PDF]

, 2016
We investigate anew the distribution of absolute carbon abundance, $A$(C) $= \log\,\epsilon $(C), for carbon-enhanced metal-poor (CEMP) stars in the halo of the Milky Way, based on high-resolution spectroscopic data for a total sample of 305 CEMP stars ...
Beers, Timothy C., Carollo, Daniela, Hansen, Terese T., He, Siyu, Placco, Vinicius M., Rasmussen, Kaitlin C., Roederer, Ian U., Yoon, Jinmi, Zeanah, Jeff   +8 more
core   +2 more sources