144 citations · 901 across the 34 of their papers we have counts for
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Variability in Proto-Planetary Nebulae: I. Light Curve Studies of 12 Carbon-Rich Objects
Bruce J. Hrivnak, Wenxian Lu, Richard E. Maupin +1
We have carried out long-term (14 years) V and R photometric monitoring of 12 carbon-rich proto-planetary nebulae. The light and color curves display variability in all of them. Th…
Spitzer IRS Spectra of Luminous 8 micron Sources in the Large Magellanic Cloud: Testing color-based classifications
Catherine L. Buchanan, Joel H. Kastner, Bruce J. Hrivnak +1
We present archival Spitzer IRS spectra of 19 luminous 8 micron selected sources in the Large Magellanic Cloud (LMC). The object classes derived from these spectra and from an addi…
A Spitzer Study of 21 and 30 Micron Emission in Several Galactic Carbon-rich Proto-Planetary Nebulae
Bruce J. Hrivnak, Kevin Volk, Sun Kwok
We have carried out mid-infrared spectroscopy of seven Galactic proto-planetary nebulae (PPNs) using the Spitzer Space Telescope. They were observed from 10-36 microns at relativel…