Results 61 to 70 of about 47,444 (303)

Star formation histories of late-type dwarfs outside the Local Group

, 2001
We describe the star formation histories of three late-type dwarfs located outside the Local Group: IZw18, NGC1569 and NGC1705. The results are based on the application of the method of synthetic colour-magnitude diagrams to deep HST photometric data. All the examined galaxies were already forming stars at the reached lookback time and show no evidence
Tosi, M., Greggio, L., Annibali, F., Aloisi, A.   +3 more
openaire   +2 more sources

Contributions of late-type dwarf stars to the soft X-ray diffuse background

The Astrophysical Journal, 1990
Comprehensive calculations of the contribution of late-type dwarf stars to the soft X-ray diffuse background are presented. The mean X-ray luminosity as derived from optically and X-ray selected samples is examined, using the Bahcall-Soneira Galaxy model to describe the spatial distribution of stars and recent results on the X-ray spectra.
J. H. M. M. Schmitt, S. L. Snowden
openaire   +1 more source

Disentangling the Planet from the Star in Late-Type M Dwarfs: A Case Study of TRAPPIST-1g [PDF]

The Astronomical Journal, 2018
Abstract The atmospheres of late M stars represent a significant challenge in the characterization of any transiting exoplanets because of the presence of strong molecular features in the stellar atmosphere. TRAPPIST-1 is an ultracool dwarf, host to seven transiting planets, and contains its own molecular signatures that can potentially ...
H. R. Wakeford, N. K. Lewis, J. Fowler, G. Bruno, T. J. Wilson, S. E. Moran, J. Valenti, N. E. Batalha, J. Filippazzo, V. Bourrier, S. M. Hörst, S. M. Lederer, J. de Wit   +12 more
openaire   +3 more sources

Optical Studies of Twenty Longer-Period Cataclysmic Binaries

, 2010
We obtained time-series radial velocity spectroscopy of twenty cataclysmic variable stars, with the aim of determining orbital periods P_orb. All of the stars reported here prove to have P_orb > 3.5 h.
Peters, Christopher S., Skinner, Julie N., Thorstensen, John R.   +2 more
core   +1 more source

TOGR3, a Proteasome β4 Subunit, Orchestrates Sugar Homeostasis to Trade Off Growth and Thermotolerance in Rice

Advanced Science, EarlyView.
This study identifies a novel thermoregulatory mechanism in rice: TOGR3 partners with 26S proteasome subunits, including TT1, to drive thermoresponsive ubiquitin–proteasome activity, maintaining sugar homeostasis in stomatal regulation to balance growth and stress resistance.
Biyao Zhang, Xiaoyan Wu, Ting Xu, Feifei Guo, Xiaolu Shen, Cuiping Meng, Yanan Wang, Xue Han, Hong Zhao, Yongbiao Xue   +9 more
wiley   +1 more source

Studies of late-type dwarfs. V - Theoretical models for lower main-sequence stars

The Astrophysical Journal, 1983
New theoretical stellar models for the lower end of the main sequence have been computed for a wide range in metallicity. These models are based on new low-temperature opacities, which include the contributions from the most important molecules, as well as published model atmospheres, which guided the choice of surface boundary conditions.
D. A. Vandenberg, F. D. A. Hartwick, P. Dawson, D. R. Alexander   +3 more
openaire   +1 more source

Evidence of Rocky Planetesimals Orbiting Two Hyades Stars

, 2013
The Hyades is the nearest open cluster, relatively young and containing numerous A-type stars; its known age, distance, and metallicity make it an ideal site to study planetary systems around 2-3 Msun stars at an epoch similar to the late heavy ...
Farihi, J., Gänsicke, B. T., Koester, D.   +2 more
core   +1 more source

Swift/UVOT Photometry of the Planetary Nebula WeBo 1: Unmasking A Faint Hot Companion Star [PDF]

, 2012
We present an analysis of over 150 ks of data on the planetary nebula WeBo 1 (PN G135.6+01.0) obtained with the Swift Ultraviolet Optical Telescope (UVOT). The central object of this nebula has previously been described as a late-type K giant barium star
Bond, Howard E., Breeveld, Alice A., Hoversten, Erik, Siegel, Michael H., Stark, Michele   +4 more
core   +2 more sources

Biomimetic Cell Membrane‐Coated MOFs System for Targeted Cancer Therapy

Advanced Science, EarlyView.
Biomimetic MOF‐based drug delivery nanoplatforms synthesized using liposomes or cell membranes as camouflage for multiple cancer therapeutics. ABSTRACT The integration of metal‐organic frameworks (MOFs) with cell membrane coatings has emerged as a revolutionary strategy to enhance the therapeutic efficacy of cancer nanomedicine.
Qilu Wu, Jia Song Deon Chon, Yuxiao Feng, Kang Liang, Shiming Li, Can Yang Zhang, Jun Ge   +6 more
wiley   +1 more source

Slowing Down Zinc Electrodeposition Kinetics Can Maximize and Compromise Anode Stability: How Slow Is Too Slow?

Angewandte Chemie, EarlyView.
Zinc anode performance is maximized within an optimal deposition‐kinetic window. Additives that tune the deposition exchange current density (i0,Dep) suppress HER at intermediate values, but overly fast kinetics promote dendrites and overly slow kinetics accelerate corrosion/HER.
Md. Arif Faisal, Taizhe Liu, Ashutosh Rana, James H. Nguyen, Saptarshi Paul, Ashutosh Bhadouria, Brian M. Tackett, Jeffrey E. Dick   +7 more
wiley   +2 more sources