Results 41 to 50 of about 64,475 (321)

SP_Ace: a new code to derive stellar parameters and elemental abundances

, 2015
Aims: We developed a new method of estimating the stellar parameters Teff, log g, [M/H], and elemental abundances. This method was implemented in a new code, SP_Ace (Stellar Parameters And Chemical abundances Estimator).
Boeche, C., Grebel, E. K.
core   +1 more source

THE SENSITIVITY OF CONVECTION ZONE DEPTH TO STELLAR ABUNDANCES: AN ABSOLUTE STELLAR ABUNDANCE SCALE FROM ASTEROSEISMOLOGY [PDF]

The Astrophysical Journal, 2012
37 pages, 12 figures, 2 tables, submitted to ApJ.
van Saders, Jennifer L., Pinsonneault, Marc H.   +1 more
openaire   +2 more sources

THE IMPACT OF STELLAR ABUNDANCE VARIATIONS ON STELLAR HABITABLE ZONE EVOLUTION [PDF]

The Astrophysical Journal, 2012
The high quality spectra required for radial velocity planet searches are well-suited to providing abundances for a wide array of elements in large samples of stars. Abundance ratios of the most common elements relative to Fe are observed to vary by more than a factor of two in planet host candidates. This level of variation has a substantial impact on
Young, Patrick A., Liebst, Kelley, Pagano, Michael   +2 more
openaire   +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

Observable Signatures of Planet Accretion in Red Giant Stars I: Rapid Rotation and Light Element Replenishment

, 2012
The orbital angular momentum of a close-orbiting giant planet can be sufficiently large that, if transferred to the envelope of the host star during the red giant branch (RGB) evolution, it can spin-up the star's rotation to unusually large speeds.
Alexander, Balachandran, Bard, Bard, Bizyaev, Blackwell, Blackwell, Blackwell, Blackwell, Blackwell, Blaise, Boothroyd, Busso, Butler, Böhm-Vitense, Carlberg, Carlberg, Carlberg, Carlberg, Carney, Castelli, Castilho, Chanamé, Charbonnel, Charbonnel, da Silva, Davis, de Medeiros, de Medeiros, Denissenkov, Denissenkov, Drake, Duquennoy, Eggleton, Frink, Fuhr, Fulbright, Ghezzi, Glebocki, Gratton, Griffin, Griffin, Hinkle, Houdashelt, Høg, Joleen K. Carlberg, Katia Cunha, Kumar, Kumar, Kurucz, Kurucz, Kurucz, Kurucz, Kurucz, Lodders, Majewski, Mandell, Massarotti, Mitchell, Mousis, Nordhaus, Palmerini, Paxton, Pilachowski, Piskunov, Raassen, Rabl, Raghavan, Reddy, Reddy, Ruchti, Sackmann, Sato, Schlegel, Shetrone, Smith, Smith, Sneden, Steven R. Majewski, Strassmeier, Uesugi, Verne V. Smith, Vogt, Wasserburg   +83 more
core   +1 more source

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

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

A Systematic NLTE Study of Very Metal-poor Stars with Metallicity down to −4.3 dex. I. Global Stellar Parameters Based on High-resolution Spectra

The Astrophysical Journal
Very metal-poor (VMP) stars provide a record of the chemical composition and dynamics of the early Galaxy. Based on the high-resolution and high signal-to-noise ratio spectra from the Subaru Telescope for 103 VMP stars, in this series of papers we ...
Jianrong Shi, Gang Zhao, Shuai Liu, Zeming Zhou, Haining Li, Hongliang Yan, Sofya Alexeeva, Huawei Zhang, Wako Aoki, Tadafumi Matsuno, Jingkun Zhao, Huiling Chen, Yufu Shen   +12 more
doaj   +1 more source

Chemical consequences of low star formation rates: stochastically sampling the IMF

, 2008
When estimating the abundances which result from a given star formation event, it is customary to treat the IMF as a series of weight factors to be applied to the stellar yields, as a function of mass, implicitly assuming one is dealing with an infinite ...
Anders, Asplund, Carigi, Carigi, Carigi, Carigi, Carigi, Cerviño, Cerviño, Cerviño, Cescutti, Fenner, Geisler, Gilmore, Goodwin, Greggio, Greggio, Hernandez, Hirschi, Ikuta, Kniazev, Koeppen, Kroupa, Kroupa, L. Carigi, Lanfranchi, Lanfranchi, Maeder, Maeder, Maeder, Marcolini, Marigo, Marigo, Massey, Matteucci, McWilliam, Meynet, Pagel, Portinari, Sbordone, Shetrone, Shetrone, Thielemann, Tonry, van Zee, Venn, Weidner, Weidner, Woosley, X. Hernandez   +49 more
core   +1 more source

Applications of Abundance Data and Requirements for Cosmochemical Modeling [PDF]

, 2001
Understanding the evolution of the universe from Big Bang to its present state requires an understanding of the evolution of the abundances of the elements and isotopes in galaxies, stars, the interstellar medium, the Sun and the heliosphere, planets and
Binns, W. R., Busemann, H., Chiappini, C., Gloeckler, G., Hoppe, P., Kirilova, D., Leske, R. A., Manuel, O. K., Mewaldt, R. A., Möbius, E., Wieler, R., Wiens, R. C., Wimmer-Schweingruber, R. F., Yanasak, N. E.   +13 more
core   +2 more sources