Todd C. Hillwig

Modeling the SS 433 Jet Bends (2008)

Marshall, Herman L., Canizares, Claude R., Schulz, Norbert S., Heinz, Sebastian, Hillwig, Todd C., Mioduszewski, Amy J.

We fit Chandra HETGS data obtained for the unusual X-ray binary SS 433. While line strengths and continuum levels hardly change, the jet Doppler shifts show aperiodic variations that probably result...

Binary central stars of PN discovered through photometric variability. I. What we know and what we would like to find out (2008)

De Marco, Orsola, Hillwig, Todd C., Smith, A. J.

Shaping axi-symmetric planetary nebulae is easier if a companion interacts with a primary at the top of the asymptotic giant branch. To determine the impact of binarity on planetary nebula formation...

Spectroscopic Observations of the Mass Donor Star in SS 433 (2007)

Hillwig, Todd C., Gies, Douglas R.

The microquasar SS 433 is an interacting massive binary consisting of an evolved mass donor and a compact companion that ejects relativistic jets. The mass donor was previously identified through...

Binary and Multiple O-Type Stars in the Cas OB6 Association (2005)

Hillwig, Todd C., Gies, Douglas R., Bagnuolo, William G., Jr., Huang, Wenjin, McSwain, M. Virginia, ...

We present the results of time-resolved spectroscopy of 13 O-type stars in the Cas OB6 stellar association. We conducted a survey for radial velocity variability in search of binary systems, which...

Two New Close Binary Central Stars of Planetary Nebulae from a Critically Selected Southern Hemisphere Sample (2003)

Hillwig, Todd C.

I present the results of time-resolved photometry of a selection of central stars of planetary nebulae. The study reveals periodic variability in two of the eight central stars observed, those of NGC...

Analysis of the radial profile emissivity of accretion disks in cataclysmic variables /--by Todd C. Hillwig. (1995)

Hillwig, Todd C.

Thesis (M.S.)--Ball State University, 1995.