Results 41 to 50 of about 4,605,994 (345)
Chlorine and Sulfur in Nearby Planetary Nebulae and H II Regions [PDF]
, 2011 We derive the chlorine abundances in a sample of nearby planetary nebulae (PNe) and H II regions that have some of the best available spectra. We use a nearly homogeneous procedure to derive the abundance in each object and find that the Cl/H abundance ...
Gloria Delgado-Inglada +4 more
core +1 more source
Structure and expansion law of H ii regions in structured molecular clouds [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We present radiation-magnetohydrodynamic simulations aimed at studying evolutionary properties of H ii regions in turbulent, magnetized, and collapsing molecular clouds formed by converging flows in the warm neutral medium.
Manuel Zamora-Avil'es +8 more
semanticscholar +1 more source
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
THE WISE CATALOG OF GALACTIC H ii REGIONS [PDF]
, 2013 Using data from the all-sky Wide-Field Infrared Survey Explorer (WISE) satellite, we made a catalog of over 8000 Galactic H ii regions and H ii region candidates by searching for their characteristic mid-infrared (MIR) morphology.
L. Anderson +8 more
semanticscholar +1 more source
Carbon and oxygen in H II regions of the Magellanic Clouds: abundance discrepancy and chemical evolution [PDF]
, 2017 We present C and O abundances in the Magellanic Clouds derived from deep spectra of HII regions. The data have been taken with the Ultraviolet-Visual Echelle Spectrograph at the 8.2-m VLT. The sample comprises 5 HII regions in the Large Magellanic Cloud (
L. Cipriano +15 more
semanticscholar +1 more source
CHAOS I. DIRECT CHEMICAL ABUNDANCES FOR H II ?> REGIONS IN NGC 628 [PDF]
, 2015 The CHemical Abundances of Spirals (CHAOS) project leverages the combined power of the Large Binocular Telescope (LBT) with the broad spectral range and sensitivity of the Multi Object Double Spectrograph (MODS) to measure “direct” abundances (based on ...
D. Berg +5 more
semanticscholar +1 more source
Expansive components in H II regions
, 2004 We study the presence of low intensity high velocity components, which we have termed wing features in the integrated Halpha emission line profiles of the HII region populations of the spiral barred galaxies NGC 1530, NGC 3359 and NGC 6951.
Arsenault +19 more
core +1 more source
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
Ionization Profiles of Galactic H ii Regions [PDF]
Astrophysical Journal Supplement Series, 2018 Using Green Bank Telescope radio recombination line (RRL) data, we analyze the role of leaking radiation from H ii regions in maintaining the ionization of the interstellar medium (ISM).
M. Luisi +4 more
semanticscholar +1 more source
MMT observations of new extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey
, 2007 We present 6.5-meter MMT spectrophotometry of 20 H II regions in 13 extremely metal-poor emission-line galaxies selected from the Data Release 5 of the Sloan Digital Sky Survey to have [O III] 4959/Hbeta < 1 and [N II] 6583/Hbeta < 0.05.
Stasinska G. +2 more
core +1 more source