Modeling Binary Central Stars of Planetary Nebulae II: a Study of Hatr 4 and SP 1

Details Modeling Binary Central Stars of Planetary Nebulae II: a Study of Hatr 4 and SP 1 Modeling Binary Central Stars of Planetary Nebulae II: a Study of Hatr 4 and SP 1

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jsara...5...19b&link_type=abstract

Journal of the Southeastern Association for Research in Astronomy, vol. 5, p. 19-24

Astronomy and Astrophysics

Astronomy

Binaries: Close, Planetary Nebula: Bipolar, Planetary Nebula: Individual: Sp 1, Hatr 4

Scientific paper

We have modeled the binary central star systems of the planetary nebulae HaTr 4 and Sp 1. The models are based on light curves from data taken over several years. A large parameter space has been explored to find constraints on the systems' characteristics. Some limitations have been made on the parameter space from values found in literature. The focus of the limitations is on the mass, radius, and temperature of the central star, the type of companion star, and the inclination of the system since these are the most important physical properties of the system. The temperature and radius of both stars and the inclination also affect the shape of the light curve. The binary hypothesis is based on the premise that binary star systems cause the non-spherical shape of planetary nebulae. The hypothesis predicts a correlation between the system's inclination and the nebula's inclination. We constrained the inclination of Sp 1 between 15° and 25°. For HaTr 4, we constrained the inclination between 50° and 85° but found most of the best fits between 55° and 75°. The published values for the HaTr 4 nebular inclination fall within our calculated ranges for the binary inclination. For Sp 1, the published nebular inclination values fall just outside our modeled binary inclination range.

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