Results 301 to 310 of about 126,212 (334)

Cometary Blue Compact Dwarf Galaxies:

Astrophysics and Space Science, 2001
‘Cometary’ Blue Compact Dwarf Galaxies (iI,C BCDs) are characterized by off-center starbursts close to the end of an elongated dwarf irregular (dI)-like host galaxy. This may either represent randomly enhanced star-forming activity of a dI, or may be caused by a set of special properties of such systems or their environment.
K. G. Noeske, N. G. Guseva, K. J. Fricke, Y. I. Izotov, P. Papaderos, T. X. Thuan   +5 more
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Blue-spotted Dwarf-Iguana (Enyalioides praestabilis)

2023
This is the species account about the Blue-spotted Dwarf-Iguana (Enyalioides praestabilis), a chapter in the Reptiles of Ecuador book. This account summarizes novel as well as historical information (recognition, natural history, distribution, conservation, etymology, and relevant literature) about the species and provides maps and images to facilitate
Alejandro Arteaga, Gabriela Aguiar
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Blue-throated Dwarf-Iguana (Enyalioides microlepis)

2023
This is the species account about the Blue-throated Dwarf-Iguana (Enyalioides microlepis), a chapter in the Reptiles of Ecuador book. This account summarizes novel as well as historical information (recognition, natural history, distribution, conservation, etymology, and relevant literature) about the species and provides maps and images to facilitate ...
Alejandro Arteaga, Gabriela Aguiar
openaire   +1 more source

White dwarfs sing the blues

Nature, 1998
A new model predicts that the oldest white dwarf stars should look blue. That could help to identify what makes up the massive halo of our Galaxy, and to pin down the age of the Universe.
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Isolated groups of extremely blue dwarf galaxies

Proceedings of the International Astronomical Union, 2019
AbstractInteractions and mergers between dwarf galaxies are mostly gas-rich and should be marked by an intense star formation activity. But these processes, which are expected to be common at earlier times, are very difficult to observe at low redshifts. To investigate that, we look in the Sloan Digital Sky Survey (SDSS) for compact groups that contain
Vitor Bootz, Marina Trevisan, Trinh Thuan, Yuri Izotov, Angela Krabbe, Oli Dors   +5 more
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Blue Compact Dwarfs: Extreme Dwarf Irregular Galaxies

1987
In Hubble’s classification scheme, dwarf irregular galaxies (dIs) are low luminosity systems (MB≳ -16) which are at the end of the galaxy morphological sequence and which lack both a dominating nucleus and rotational symmetry [1]. We concentrate here on a class of dIs which are so extreme in these properties that they appear almost stellar in ...
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The Blue Compact Dwarf Galaxy IZw18

Memorie della Società Astronomica Italiana. Supplementi, 2012
We present the results obtained for the Blue compact galaxy IZw18 on the basis of ACS HST data obtained from our group. In particular, we discuss the stellar population and the variable stars content of this galaxy to get information about its star formation history and distance.
Musella, I., Marconi, M., Fiorentino, G., Clementini, G., Aloisi, A., Annibali, F., Contreras, R., Saha, A., Tosi, M., van der Marel, R. P.   +9 more
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Globular Clusters, White Dwarfs, and Blue Stragglers

1998
One of the fundamental concepts in astronomy is that the stars of a given cluster formed at about the same time. This can be seen easily in a Hertzsprung-Russell diagram, where the colors of the stars are plotted against their brightnesses. The diagram is not evenly populated but shows several preferred areas; the main sequence, corresponding to the ...
Daniel Fischer, Hilmar Duerbeck
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NGC 1705: The missing link between blue compact dwarf and dwarf elliptical galaxies?

Astrophysics and Space Science, 1989
We report results of a detailed study of the nearby blue compact dwarf galaxy NGC 1705. There are two stellar populations in NGC 1705: an underlying population around a Gyr old or older, and a young population of fairly continuous star formation for the last 250 Myr.
Gerhardt R. Meurer, K. C. Freeman, Michael A. Dopita   +2 more
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On the Metallicity of Blue Compact Dwarfs

2011
Based on the even distribution of metals in Blue Compact Dwarfs (BCDs) spread all over their volume, we show that a large amount of stars (≥108 M⊙) are required to justify such a homogeneous metal abundance. We also show that such a mass would imply a large number of bursts similar to the ones presently energizing the giant nebulae.
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