Results 261 to 270 of about 693,331 (292)

Scalable Approach to Consumer Wearable Postmarket Surveillance: Development and Validation Study.

JMIR Med Inform
Yoo RM, Viggiano BT, Pundi KN, Fries JA, Zahedivash A, Podchiyska T, Din N, Shah NH.   +7 more
europepmc   +1 more source

The dramatic transition of the extreme Red Supergiant WOH G64 to a Yellow Hypergiant

Munoz-Sanchez G, Kalitsounaki M, de Wit S, Antoniadis K, Bonanos A, Zapartas E, Boutsia K, Christodoulou E, Maravelias G, Soszyński I, Udalski A.   +10 more
europepmc   +1 more source

Starbursts in Ring and Irregular Galaxies

Publications of the Astronomical Society of Australia, 1991
AbstractThis paper presents the current status of a Ph.D. project undertaken to search for extended-scale bursts of star formation (> 1 kpc) in irregular and collisionally produced ring galaxies, principally in the southern half of the sky. Results of recent 8.4 GHz radio continuum observations and UBVRI CCD imaging of some of the program galaxies ...
V. J. McIntyre, W. J. Zealey
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Star Formation in Irregular Galaxies

Science, 1989
Irregular galaxies can be viewed as laboratories for studying the processes of star formation. This class of galaxy, unlike the more familiar spiral galaxies, forms stars without spiral arms and does so from a chemically less-evolved interstellar medium.
Deidre A. Hunter, John S. Gallagher
openaire   +3 more sources

Carbon monoxide in clouds at low metallicity in the dwarf irregular galaxy WLM

Nature, 2013
Carbon monoxide (CO) is the primary tracer for interstellar clouds where stars form, but it has never been detected in galaxies in which the oxygen abundance relative to hydrogen is less than 20 per cent of that of the Sun, even though such ‘low ...
B. Elmegreen, M. Rubio, D. Hunter, C. Verdugo, E. Brinks, A. Schruba   +5 more
semanticscholar   +1 more source

Structure and Evolution of Irregular Galaxies

Annual Review of Astronomy and Astrophysics, 1984
Proprietes fondamentales: lumiere, masses et cinematique, abondances, populations stellaires. Proprietes de la formation stellaire: taux de formation stellaire, distribution des regions de formation stellaire, les complexes de formation stellaire et le milieu interstellaire, la fonction de masse initiale, le gaz utilisable.
John S. Gallagher, Deidre A. Hunter
openaire   +2 more sources

Dwarf Irregular Galaxies

2004
Dwarf irregular galaxies at optical wavelengths are small, faint and appear to be unstructured and irregular in shape. They are typically gas-rich, metal-poor systems, with varying levels of STAR FORMATION occurring in a haphazard manner across the ...
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Clumpy Irregular Galaxies

1983
Our planet Earth revolves around the Sun, 150 million kilometers away. Our Sun is just one of the 100 billions or so stars which swarm across our Galaxy, a vast system with diameter around 100 000 light-years.* Our Galaxy is one of the billion other galaxies which our most powerful telescopes are able to detect in the depths of space, at distances up ...
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Abundances in dwarf irregular galaxies

Publications of the Astronomical Society of the Pacific, 1986
The results of abundance studies of dwarf irregular galaxies and similar objects are reviewed with special attention to variations in the CNO element group. Observations of the forbidden N II and semiforbidden C III lines in the most metal-poor galaxy known, IZw 18, are presented for the first time and CNO abundances are derived via a photoionization ...
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Optical and H I studies of the gas-rich dwarf irregular galaxy DDO 154

, 1989
A study of the luminous and dark components of the dwarf irregular galaxy DDO 154 is presented. A scale length of 0.5 kpc and a central surface brightness B(0)v = 23.17 are derived for the stellar disk with mean colors typical of Im galaxies.
C. Carignan, S. Beaulieu
semanticscholar   +1 more source