Results 91 to 100 of about 176,382 (265)

The Early Chemical Evolution of Dwarf Irregular Galaxies [PDF]

Highlights of Astronomy, 2005
AbstractInvestigations have been performed to understand the age of dwarf irregular galaxies from the point of view of their presently low chemical abundances and the enhanced star-formation rate. While for a few objects, like e.g. I Zw 18, their assumed relative youth can be verified by models taking a double-starburst behavior into account, those ...
Andreas Rieschick, Joachim Köppen, Simone Recchi, Gerhard Hensler   +3 more
openaire   +3 more sources

Leaf Anatomy and Photochemical Behaviour of Solanum lycopersicum L. Plants from Seeds Irradiated with Low‐LET Ionising Radiation

The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014
Plants can be exposed to ionising radiation not only in Space but also on Earth, due to specific technological applications or after nuclear disasters. The response of plants to ionising radiation depends on radiation quality/quantity and/or plant characteristics. In this paper, we analyse some growth traits, leaf anatomy, and ecophysiological features
V. De Micco, R. Paradiso, G. Aronne, S. De Pascale, M. Quarto, C. Arena, Charles Hocart   +6 more
wiley   +1 more source

First Stellar Abundances in the Dwarf Irregular Galaxy Sextans A [PDF]

The Astronomical Journal, 2004
We present the abundance analyses of three isolated A-type supergiant stars in the dwarf irregular galaxy Sextans A from high-resolution spectra the UVES spectrograph at the VLT. Detailed model atmosphere analyses have been used to determine the stellar atmospheric parameters and the elemental abundances of the stars.
Christophe Pinte, Eline Tolstoy, Rolf-Peter Kudritzki, Andreas Kaufer, Kim A. Venn   +4 more
openaire   +4 more sources

Chemodynamical Simulations of Dwarf Galaxy Evolution

Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014
In this review I give a summary of the state of the art for what concerns the chemo‐dynamical numerical modelling of galaxies in general and of dwarf galaxies in particular. In particular, I focus my attention on (i) initial conditions, (ii) the equations to solve; (iii) the star formation process in galaxies, (iv) the initial mass function, (v) the ...
Simone Recchi, José Manuel Vílchez Medina   +1 more
wiley   +1 more source

Identification of dusty massive stars in star-forming dwarf irregular galaxies in the Local Group with mid-IR photometry [PDF]

, 2015
Increasing the statistics of spectroscopically confirmed evolved massive stars in the Local Group enables the investigation of the mass loss phenomena that occur in these stars in the late stages of their evolution.
N. Britavskiy, A. Bonanos, A. Mehner, M. Boyer, K. McQuinn   +4 more
semanticscholar   +1 more source

Evidence for Mass-dependent Evolution of Transitional Dwarf Galaxies in the Virgo Cluster

The Astrophysical Journal
The presence of transitional dwarf galaxies in cluster environments supports the hypothesis that infalling star-forming galaxies are transformed into quiescent early-type dwarf galaxies (ETdGs) through environmental effects.
Suk Kim, Soo-Chang Rey, Youngdae Lee
doaj   +1 more source

Commodity risk assessment of Betula pendula and Betula pubescens plants from the UK

EFSA Journal, Volume 22, Issue 11, November 2024.
Abstract The European Commission requested the EFSA Panel on Plant Health to prepare and deliver risk assessments for commodities listed in Commission Implementing Regulation (EU) 2018/2019 as ‘High risk plants, plant products and other objects’. This Scientific Opinion covers plant health risks posed by plants of Betula pendula and B.
EFSA Panel on Plant Health (PLH), Antonio Vicent Civera, Paula Baptista, Anna Berlin, Elisavet Chatzivassiliou, Jaime Cubero, Nik Cunniffe, Eduardo de la Peña, Nicolas Desneux, Francesco Di Serio, Anna Filipiak, Beata Hasiów‐Jaroszewska, Hervé Jactel, Blanca B. Landa, Lara Maistrello, David Makowski, Panagiotis Milonas, Nikos T. Papadopulos, Roel Potting, Hanna Susi, Dirk Jan Van Der Gaag, Andrea Battisti, Claude Bragard, Christer Sven Magnusson, Hugo Mas, Daniel Rigling, Massimo Faccoli, Alžběta Mikulová, Fabio Stergulc, Eugen Christoph, Olaf Mosbach‐Schulz, Franz Streissl, Paolo Gonthier   +32 more
wiley   +1 more source

Astronomical Signatures of Dark Matter

Advances in High Energy Physics, Volume 2014, Issue 1, 2014., 2014
Several independent astronomical observations in different wavelength bands reveal the existence of much larger quantities of matter than what we would deduce from assuming a solar mass to light ratio. They are very high velocities of individual galaxies within clusters of galaxies, higher than expected rotation rates of stars in the outer regions of ...
Paul Gorenstein, Wallace Tucker, Anselmo Meregaglia   +2 more
wiley   +1 more source

The relation between atomic gas and star formation rate densities in faint dwarf irregular galaxies [PDF]

, 2014
We use data for faint (M_B > -14.5) dwarf irregular galaxies drawn from the FIGGS survey to study the correlation between the atomic gas density (Sigma_gas,atomic) and star formation rate (Sigma_SFR) in the galaxies.
S. Roychowdhury, J. Chengalur, S. Kaisin, I. Karachentsev   +3 more
semanticscholar   +1 more source

Spectral Energy Distributions for 258 Local Volume Galaxies

The Astronomical Journal, 2023
We present model spectral energy distribution (SED) fits to ultraviolet/optical/infrared observations for the 258 nearby galaxies in the Local Volume Legacy survey, a sample dominated by lower-luminosity dwarf irregular systems.
Daniel A. Dale, Médéric Boquien, Jordan A. Turner, Daniela Calzetti, Robert C. Kennicutt Jr., Janice C. Lee   +5 more
doaj   +1 more source