Results 81 to 90 of about 876,778 (355)

The extent of mixing in stellar interiors: the open clusters Collinder 261 and Melotte 66 [PDF]

, 2016
Context: Determining carbon and nitrogen abundances in red giants provides useful diagnostics to test mixing processes in stellar atmospheres. Aims: Our main aim is to determine carbon-to-nitrogen and carbon isotope ratios for evolved giants in the open ...
Bragaglia, Angela, Drazdauskas, Arnas, Janulis, Rimvydas, Mikolaitis, Šarūnas, Randich, Sofia, Tautvaišienė, Gražina   +5 more
core   +2 more sources

occumb: An R package for site occupancy modeling of eDNA metabarcoding data

Population Ecology, EarlyView.
This study introduces a new R package, occumb, for the convenient application of site occupancy modeling using environmental DNA (eDNA) metabarcoding data. We outline a data analysis workflow, including data setup, model fitting, model assessment, and comparison of potential study settings based on model predictions, all of which can be performed using
Keiichi Fukaya, Yuta Hasebe
wiley   +1 more source

The Stellar Abundances for Galactic Archaeology (SAGA) data base - II. Implications for mixing and nucleosynthesis in extremely metal-poor stars and chemical enrichment of the Galaxy [PDF]

, 2010
We discuss the characteristics of known extremely metal-poor (EMP) stars in the Galaxy using the Stellar Abundances for Galactic Archaeology (SAGA) database (Suda et al. 2008, PASJ, 60, 1159).
T. Suda, S. Yamada, Y. Katsuta, Y. Komiya, C. Ishizuka, W. Aoki, M. Fujimoto   +6 more
semanticscholar   +1 more source

SAGA: Stellar Abundances for Galatic Archeology [PDF]

Proceedings of XII International Symposium on Nuclei in the Cosmos — PoS(NIC XII), 2013
A tutorial for the Stellar Abundances for Galactic Archaeology (SAGA) database is presented. This paper describes the outline of the database, reports the current status of the data compilation and known problems, and presents plans for future updates and extensions.
openaire   +3 more sources

Stellar Mixing and the Primordial Lithium Abundance [PDF]

The Astrophysical Journal, 2002
We compare the properties of recent samples of the lithium abundances in halo stars to one another and to the predictions of theoretical models including rotational mixing, and we examine the data for trends with metal abundance. We find from a KS test that in the absence of any correction for chemical evolution, the Ryan, Norris, & Beers (1999 ...
Terry P. Walker, Marc H. Pinsonneault, Vijay K. Narayanan, Vijay K. Narayanan, Gary Steigman   +4 more
openaire   +3 more sources

Between Droughts and Floods: The Seasonal Response of Freshwater Snails in Artificial Reservoirs in the Brazilian Semiarid Region

Population Ecology, EarlyView.
We investigate the seasonal dynamics of two freshwater snails, Biomphalaria straminea and Melanoides tuberculata, in artificial reservoirs of the Brazilian semiarid region. Despite regulated hydrology, B. straminea exhibited strong seasonal fluctuations associated with dry periods, while M. tuberculata maintained stable populations throughout the year,
Lucas Henrique Sousa da Silva, João Hemerson de Sousa, Adriana Josefa da Rocha, Manuella Feitosa Leal, Lucas Ariel de Sousa Aguiar, Tamaris Gimenez Pinheiro, Edson Lourenço da Silva   +6 more
wiley   +1 more source

The GAPS Programme with HARPS-N at TNG. X. Differential abundances in the XO-2 planet hosting binary [PDF]

, 2015
Binary stars hosting exoplanets are a unique laboratory where chemical tagging can be performed to measure with high accuracy the elemental abundances of both stellar components, with the aim to investigate the formation of planets and their subsequent ...
Affer, L., Biazzo, K., Boccato, C., Bonomo, A. S., Borsa, F., Claudi, R., Cosentino, R., Covino, E., Damasso, M., Desidera, S., Gandolfi, D., Gratton, R., Knapic, C., Lanza, A. F., Lucatello, S., Maldonado, J., Marzari, F., Micela, G., Molaro, P., Pagano, I., Pedani, M., Pillitteri, I., Piotto, G., Poretti, E., Rainer, M., Sanchez, R. Zanmar, Santos, N. C., Scandariato, G., Sozzetti, A.   +28 more
core   +2 more sources

Barium Abundances of Common Stars in the Gaia-ESO Survey and the LAMOST Medium-resolution Survey

The Astrophysical Journal
Barium (Ba) abundance has been used as a crucial tracer of both slow and rapid neutron-capture processes to constrain the evolutionary models of the Galaxy.
Tian-Yi Chen, Jian-Rong Shi, Hong-Liang Yan, Shuai Liu, Chun-Qian Li, Xiao-Jin Xie, Ze-Ming Zhou, Yao-Jia Tang, Ming-Yi Ding   +8 more
doaj   +1 more source

Forming super-Mercuries: Role of stellar abundances

Astronomy & Astrophysics, 2023
Rocky exoplanets with bulk iron mass fraction of more than 60%, known as super-Mercuries, appear to be preferentially hosted by stars with higher iron mass fraction than that of the Sun. It is unclear whether these iron-rich planets can form in the disc or whether giant impacts are necessary for their formation.
Mah, Jingyi, Bitsch, Bertram
openaire   +2 more sources

Moving in the Dark: Enlightening the Spatial Population Ecology of European Cave Salamanders

Population Ecology, EarlyView.
We assessed individual interactions, movement ecology and activity patterns of a subterranean population of Speleomantes strinatii, applying spatial capture–recapture modeling to a photographic dataset of 104 individuals. ABSTRACT Space use and movement are fundamental aspects of organisms' ecology, mirroring individual fitness, behavior, and life ...
Giacomo Rosa, Andrea Costa, Sebastiano Salvidio   +2 more
wiley   +1 more source