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Todd Hillwig
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Professor of Physics and Astronomy
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About Todd Hillwig
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Associate Professor of Physics and Astronomy,
Valparaiso University
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Featured Works
Featured Works
(13)
Article
Surveying Planetary Nebulae Central Stars for Close Binaries: Constraining Evolution ...
Galaxies (2018)
Todd Hillwig
The increase in discovered close binary central stars of planetary nebulae is leading to a sufficiently large sample to begin ...
Link
Article
The Remote Observatories of the Southeastern Association for Research in ...
Publications of the Astronomical Society of the Pacific (2017)
William C. Keel, Terry D. Oswalt, Peter Mack, Gary Henson, et al.
We describe the remote facilities operated by the Southeastern Association for Research in Astronomy (SARA) , a consortium of colleges ...
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Article
BINARY CENTRAL STARS OF PLANETARY NEBULAE DISCOVERED THROUGH PHOTOMETRIC VARIABILITY ...
The Astronomical Journal (2017)
Todd Hillwig, David J Frew, Nicole Reindl, Hannah Rotter, et al.
We find the central stars (CSs) of the planetary nebulae (PNe) HaTr7 and ESO330-9 to be close-binary systems. Both have ...
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Article
Observational Confirmation of a Link between Common Envelope Binary Interaction ...
The Astrophysical Journal (2016)
Todd Hillwig, David Jones, Orsola De Marco, Howard E Bond, et al.
A current issue in the study of planetary nebulae with close binary central stars (CSs) is the extent to which ...
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Article
Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability ...
The Astronomical Journal (2016)
Todd C Hillwig, Howard E Bond, David J Frew, S C Schaub, et al.
We explore the photometrically variable central stars of the planetary nebulae HaTr 4 and Hf 2-2. Both have been classified ...
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Article
Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability ...
Physics and Astronomy Faculty Publications (2015)
Todd Hillwig, David J Frew, Melissa Louie, Orsola De Marco, et al.
A growing number of close binary stars are being discovered among central stars of planetary nebulae. Recent and ongoing surveys ...
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Article
Identifying close binary central stars of PN with Kepler
Physics and Astronomy Faculty Publications (2015)
Orsola De Marco, J Long, George H Jacoby and Todd Hillwig
Six planetary nebulae (PN) are known in the Kepler space telescope field of view, three of which are newly identified. ...
Link
Article
The Binary Fraction Of Planetary Nebula Central Stars - II. A ...
Physics and Astronomy Faculty Publications (2015)
Dimitri Douchin, Orsola De Marco, D J Frew, G H Jacoby, et al.
There is no conclusive explanation of why ∼80 per cent of planetary nebulae (PNe) are non-spherical. In the Binary Hypothesis, ...
Link
Article
Multiwavelength Observations of the SS 433 Jets
The Astrophysical Journal (2013)
Herman L Marshall, Claude R Canizares, Todd Hillwig, Amy Mioduszewski, et al.
We present observations of the SS 433 jets using the Chandra High Energy Transmission Grating Spectrometer with contemporaneous optical and ...
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Article
Radial Velocities of Galactic O-type Sars. II. Single-Lined Spectroscopic Binaries
The Astronomical Journal (2012)
S. J. Williams, D. R. Gies, Todd Hillwig, M. V. McSwain, et al.
We report on new radial velocity measurements of massive stars that are either suspected binaries or lacking prior observations. This ...
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Article
IC 4663: the first unambiguous [WN] Wolf–Rayet central star ...
Monthly Notices of the Royal Astronomical Society (2012)
B. Miszalski, P. A. Crowther, O. De Marco, J. Koppen, et al.
We report on the serendipitous discovery of the first central star of a planetary nebula (PN) that mimics the helium- ...
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Article
Radial Velocities of Galactic O-type Stars. I. Short-Term Constant Velocity ...
The A (2011)
S. J. Williams, D. R. Gies, Todd Hillwig, M. V. McSwain, et al.
We present radial velocities for 18 Galactic O-type stars. These stars display small radial velocity scatter over timescales of one ...
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Article
NSV 11154 Is a New R Coronae Borealis Star
Publications of the Astronomical Society of the Pacific (2011)
Nustinee Kijbunchoo, Geoffrey C. Clayton, Timothy C. Vieux, N. Dickerman, et al.
NSV 11154 has been confirmed as a new member of the rare hydrogen-deficient R Coronae Borealis (RCB) stars based on ...
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