Results 91 to 100 of about 1,262,170 (343)

Rotating Models for Evolved Low-Mass Stars [PDF]

Symposium - International Astronomical Union, 2004
Low mass stars (< 2-2.5 M⊙) exhibit, at all the stages of their evolution, signatures of processes that require challenging modeling beyond the standard stellar theory. In this paper we focus on their peculiarities while they climb the red giant branch (RGB). We first compare the classical predictions for abundance variations due to the first dredge-
Charbonnel, Corinne, Palacios, Ana
openaire   +2 more sources

The M-dwarfs in Multiples (MinMs) survey – I. Stellar multiplicity among low-mass stars within 15 pc [PDF]

, 2015
We present a large-scale, volume-limited companion survey of 245 late-K to mid-M (K7-M6) dwarfs within 15 pc. Infrared adaptive optics (AO) data were analysed from the Very Large Telescope, Subaru Telescope, Canada-France-Hawaii Telescope, and MMT ...
K. Ward-Duong, J. Patience, R. Rosa, R. Rosa, R. Rosa, J. Bulger, A. Rajan, S. Goodwin, R. Parker, D. Mccarthy, C. Kulesa   +10 more
semanticscholar   +1 more source

In situ molecular organization and heterogeneity of the Legionella Dot/Icm T4SS

FEBS Letters, EarlyView.
We present a nearly complete in situ model of the Legionella Dot/Icm type IV secretion system, revealing its central secretion channel and identifying new components. Using cryo‐electron tomography with AI‐based modeling, our work highlights the structure, variability, and mechanism of this complex nanomachine, advancing understanding of bacterial ...
Przemysław Dutka, Yuxi Liu, Stefano Maggi, Debnath Ghosal, Jue Wang, Prashant P. Damke, Stephen D. Carter, Wei Zhao, Sukhithasri Vijayrajratnam, Joseph P. Vogel, Carrie L. Shaffer, Grant J. Jensen   +11 more
wiley   +1 more source

The UV Legacy Library of Young Stars as Essential Standards (ULLYSES) Large Director’s Discretionary Program with Hubble. I. Goals, Design, and Initial Results

The Astrophysical Journal
Specifically selected to leverage the unique ultraviolet capabilities of the Hubble Space Telescope, the Hubble Ultraviolet Legacy Library of Young Stars as Essential Standards (ULLYSES) is a Director’s Discretionary program of approximately 1000 orbits ...
Julia Roman-Duval, William J. Fischer, Alexander W. Fullerton, Jo Taylor, Rachel Plesha, Charles Proffitt, TalaWanda Monroe, Travis C. Fischer, Alessandra Aloisi, Jean-Claude Bouret, Christopher Britt, Nuria Calvet, Joleen K. Carlberg, Paul A. Crowther, Gisella De Rosa, William V. Dixon, Catherine C. Espaillat, Christopher J. Evans, Andrew J. Fox, Kevin France, Miriam Garcia, Scott W. Fleming, Elaine M. Frazer, Ana I. Gómez de Castro, Gregory J. Herczeg, Svea Hernandez, Alec S. Hirschauer, Bethan L. James, Christopher M. Johns-Krull, Claus Leitherer, Sean Lockwood, Joan Najita, M. S. Oey, Cristina Oliveira, Tyler Pauly, I. Neill Reid, Adric Riedel, David R. Rodriguez, David Sahnow, Ravi Sankrit, Kenneth R. Sembach, Richard Shaw, Linda J. Smith, S. Tony Sohn, Debopam Som, Leonardo Úbeda, Daniel E. Welty   +46 more
doaj   +1 more source

Nucleosynthesis in low-mass stars: Shedding light on the cosmic origin of heavy elements [PDF]

EPJ Web of Conferences
Low-mass, low-metallicity stars while evolving through the asymptotic giant branch (AGB) phase undergo significant nucleosynthesis producing the majority of slow (s-) and intermedite (i-) neutron capture elements.
Goswami Aruna
doaj   +1 more source

Induced formation of primordial low-mass stars [PDF]

New Astronomy, 2004
We show that the explosion of the first supernovae can trigger low-mass star formation via gravitational fragmentation of the supernova-driven gas shell. If the shell mass does not exceed the host galaxy gas mass, all explosions with energies E_SN > 10^{51} erg can lead to shell fragmentation.
Salvaterra, R., FERRARA, ANDREA, Schneider, R.   +2 more
openaire   +2 more sources

Evolutionary tracks and isochrones for low- and intermediate-mass stars: From 0.15 to 7 , and from to 0.03 [PDF]

, 1999
We present a large grid of stellar evolution- ary tracks, which are suitable to modelling star clusters and galaxies by means of population synthesis. The tracks are presented for the initial chemical compositions (Z = 0:0004;Y =0 :23), (Z =0 :001;Y =0 ...
L. Girardi, A. Bressan, G. Bertelli, C. Chiosi   +3 more
semanticscholar   +1 more source

Sequence determinants of RNA G‐quadruplex unfolding by Arg‐rich regions

FEBS Letters, EarlyView.
We show that Arg‐rich peptides selectively unfold RNA G‐quadruplexes, but not RNA stem‐loops or DNA/RNA duplexes. This length‐dependent activity is inhibited by acidic residues and is conserved among SR and SR‐related proteins (SRSF1, SRSF3, SRSF9, U1‐70K, and U2AF1).
Naiduwadura Ivon Upekala De Silva, Puspa Kunwar, Md Ibnul Rifat Rahman, Joanna Koryo Kwao, Nathan Lehman, Zihan Zhang, Trenton Paul, Claire Cheng, Nicholas Truex, Hui‐Ting Lee, Jun Zhang   +10 more
wiley   +1 more source

Discovery of a Proto–White Dwarf with a Massive Unseen Companion

The Astrophysical Journal
We report the discovery of SDSS J022932.28+713002.7, a nascent extremely low-mass (ELM) white dwarf (WD) orbiting a massive (>1 M _⊙ at 2 σ confidence) companion with a period of 36 hr.
Gautham Adamane Pallathadka, Vedant Chandra, Nadia L. Zakamska, Hsiang-Chih Hwang, Yossef Zenati, J. J. Hermes, Kareem El-Badry, Boris T. Gänsicke, Sean Morrison, Nicole R. Crumpler, Stefan Arseneau   +10 more
doaj   +1 more source

EMPIRICAL ISOCHRONES FOR LOW MASS STARS IN NEARBY YOUNG ASSOCIATIONS [PDF]

, 2015
Absolute ages of young stars are important for many issues in pre-main-sequence stellar and circumstellar evolution but long have been recognized as difficult to derive and calibrate.
Gregory J. Herczeg (沈雷歌), L. Hillenbrand   +1 more
semanticscholar   +1 more source