Results 41 to 50 of about 63,862 (294)

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

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

Elemental Abundances in M31: Alpha and Iron Element Abundances from Low-Resolution Resolved Stellar Spectroscopy in the Stellar Halo [PDF]

, 2019
Measurements of [Fe/H] and [$\alpha$/Fe] can probe the minor merging history of a galaxy, providing a direct way to test the hierarchical assembly paradigm.
Cunningham, Emily C., Escala, Ivanna, Gilbert, Karoline M., Kirby, Evan N., Wojno, Jennifer   +4 more
core   +3 more sources

Detailed Chemical Abundance Analysis of the Brightest Stars in the Turranburra and Willka Yaku Stellar Streams

The Astrophysical Journal
We present a detailed chemical abundance analysis of the three brightest known stars from each of the Turranburra and Willka Yaku stellar streams using high-resolution Magellan/Magellan Inamori Kyocera Echelle spectra. Abundances for 27 elements, ranging
K. B. Webber, T. T. Hansen, J. L. Marshall, Alexander P. Ji, Ting S. Li, Gary S. Da Costa, Lara R. Cullinane, Denis Erkal, Sergey E. Koposov, Kyler Kuehn, Geraint F. Lewis, Dougal Mackey, Sarah L. Martell, Andrew B. Pace, Nora Shipp, Jeffrey D. Simpson, Zhen Wan, Daniel B. Zucker, Victor A. Alvarado, Joss Bland-Hawthorn, Guilherme Limberg, Gustavo E. Medina, Sam A. Usman   +22 more
doaj   +1 more source

Abundance trend with condensation temperature for stars with different Galactic birth places

, 2016
During the past decade, several studies reported a correlation between chemical abundances of stars and condensation temperature (also known as Tc trend). However, the real astrophysical nature of this correlation is still debated.
Adibekyan, V., Delgado-Mena, E., Faria, J. P., Figueira, P., Hakobyan, A. A., Harutyunyan, G., Hernandez, J. I. Gonzalez, Israelian, G., Minchev, I., Santos, N. C., Sousa, S. G., Suarez-Andres, L.   +11 more
core   +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

Intravitreal GD2‐Specific Chimeric Antigen Receptor T‐Cell Therapy for Refractory Retinoblastoma

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Effective treatments for advanced, treatment‐resistant retinoblastoma (RB) remain limited. GD2‐specific chimeric antigen receptor (CAR) T cells show potent antitumor activity with minimal toxicity but have not previously been evaluated in RB.
Subongkoch Subhadhirasakul, Jatuporn Sujjitjoon, Pa‐thai Yenchitsomanus, Kridtin Jarutatsanangkoon, Ng Wei Loon, Kleebsabai Sanpakit, Jassada Buaboonnam, Chayamon Takpradit, Pornpimon Yuti, Nunghathai Sawasdee, Piriya Luangwattananun, Siripakorn Sangkitporn, Arnan Limmahachai, La‐ongsri Atchaneeyasakul   +13 more
wiley   +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

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +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