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H II regions with He II emission [PDF]
Publications of the Astronomical Society of the Pacific, 1991 H II regions which exhibit surprisingly strong nebular He II λ4686 emission, with I(λ4686)/I (Hβ) as high as 0.3 in some cases. The He II emission in-these objects is associated with a rather diverse set of stars, with WO stars, very early WN stars, and luminous X-ray binaries involved, and in one case what appears to be a normal O-type star. Extension
Donald R. Garnett +3 more
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Searching for Galactic H ii Regions from the LAMOST Database Based on the Multihead WDCNN Model
The Astrophysical Journal Supplement Series, 2023 A H ii region is a kind of emission nebula, and more definite samples of H ii regions can help study the formation and evolution of galaxies. Hence, a systematic search for H ii regions is necessary.
Mengxin Wang +3 more
doaj +1 more source
Properties of H II region populations in galaxies. II - The H II region luminosity function
The Astrophysical Journal, 1989 H-alpha emission-line fluxes have been measured for all of the detected H II regions in 30 nearby spiral and irregular galaxies, and these data are used to study the behavior of the H II region luminosity functions (LFs). In most galaxies, the LF is well represented by a power law function.
Robert C., Jr. Kennicutt +2 more
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Astronomy & Astrophysics, 2018 Aims. We aim to identify bipolar Galactic H II regions and to understand their parental cloud structures, morphologies, evolution, and impact on the formation of new generations of stars. Methods. We use the Spitzer-GLIMPSE, Spitzer-MIPSGAL, and Herschel-Hi-GAL surveys to identify bipolar H II regions and to examine their morphologies.
Samal, M. +5 more
openaire +2 more sources
A VLT study of metal-rich extragalactic H II regions. I. Observations and empirical abundances [PDF]
, 2005 We have obtained spectroscopic observations from 3600 Angstrom to 9200 Angstrom with FORS at the Very Large Telescope for approximately 70 H II regions located in the spiral galaxies NGC 1232, NGC 1365, NGC 2903, NGC 2997 and NGC 5236.
Bresolin, Fabio +3 more
core +3 more sources
The Stellar Content of Obscured Galactic Giant H II Regions: II. W42 [PDF]
, 2000 We present near infrared J, H, and K images and K-band spectroscopy in the giant HII region W42. A massive star cluster is revealed; the color-color plot and K-band spectroscopic morphology of two of the brighter objects suggest the presence of young ...
Blum, R. D., Conti, P. S., Damineli, A.
core +3 more sources
Ultraviolet through far-infrared spatially resolved analysis of the recent star formation in M81 (NGC 3031) [PDF]
, 2006 The recent star formation (SF) in the early-type spiral galaxy M81 is characterized using imaging observations from the far-ultraviolet to the far-infrared. We compare these data with models of the stellar, gas, and dust emission for subgalactic regions.
Bendo, George J. +15 more
core +2 more sources
Ionized gas kinematics in bipolar H ii regions [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 14 pages and 9 figures.
Hannah S Dalgleish +5 more
openaire +6 more sources
Massive Star Formation in the Ultraviolet Observed with the Hubble Space Telescope
Galaxies, 2020 Spectroscopic observations of a massive star formation in the ultraviolet and their interpretation are reviewed. After a brief historical retrospective, two well-studied resolved star clusters and the surrounding H II regions are introduced: NGC 2070 in ...
Claus Leitherer
doaj +1 more source
The Astrophysical Journal, 2023 The paper presents an analysis of multiwavelength data of a nearby star-forming site, the IC 5146 dark streamer ( d ∼ 600 pc), which has been treated as a single and long filament, fl .
L. K. Dewangan +7 more
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