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194 papers · 1 filter
Star Formation in the Nuclei of Spiral Galaxies
T. Boeker
Recent observations with the Hubble Space Telescope (HST) have revealed that a large fraction of late-type (Sc and later) spiral galaxies harbor a bright, compact stellar cluster i…
A Second Luminous Blue Variable in the Quintuplet Cluster
T. R. Geballe, F. Najarro, D. F. Figer
H and K band moderate resolution and 4 m high resolution spectra have been obtained for FMM#362, a bright star in the Quintuplet Cluster near the Galactic Center. The spectral f…
Infrared Spectroscopy of a Massive Obscured Star Cluster in the Antennae Galaxies (NGC 4038/4039) with NIRSPEC
A. M. Gilbert, J. R. Graham, I. S. McLean +6
We present infrared spectroscopy of the Antennae Galaxies (NGC 4038/4039) with NIRSPEC at the W. M. Keck Observatory. We imaged the star clusters in the vicinity of the southern nu…
Calibration of Nebular Emission-Line Diagnostics: I. Stellar Effective Temperatures
M. S. Oey, M. A. Dopita, J. C. Shields +1
We present a detailed comparison of optical H II region spectra to photoionization models based on modern stellar atmosphere models. We examine both spatially resolved and integrat…
HST and VLA Observations of the H2O Gigamaser Galaxy TXS2226-184
Heino Falcke, Andrew S. Wilson, Christian Henkel +2
We present HST/WFPC2 images in Halpha+[NII]6548,6583 lines and continuum radiation and a VLA map at 8 GHz of the H2O gigamaser galaxy TXS2226-184. This galaxy has the most luminous…
Planetary Nebulae as Probes of Stellar Evolution and Populations
Letizia Stanghellini
Planetary Nebulae (PNe) have been used satisfactory to test the effects of stellar evolution on the Galactic chemical environment. Moreover, a link exists between nebular morpholog…