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Todd Hillwig

Planetary nebulae: individual (ESO 330-9)

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Binary Central Stars Of Planetary Nebulae Discovered Through Photometric Variability. V. The Central Stars Of Hatr 7 And Eso 330-9, Todd Hillwig, David J. Frew, Nicole Reindl, Hannah Rotter, Andrew Webb, Steve Margheim Dec 2016

Binary Central Stars Of Planetary Nebulae Discovered Through Photometric Variability. V. The Central Stars Of Hatr 7 And Eso 330-9, Todd Hillwig, David J. Frew, Nicole Reindl, Hannah Rotter, Andrew Webb, Steve Margheim

Todd Hillwig

We find the central stars (CSs) of the planetary nebulae (PNe) HaTr7 and ESO330-9 to be close-binary systems. Both have orbital periods of less than half a day and contain an irradiated cool companion to the hot CS. We provide light curves, spectra, radial velocity curves, orbital periods, and binary modeling results for both systems. The binary modeling leads to system parameters, or ranges of allowed parameters for each system. We find that for the CS of HaTr7 we need to use limb-darkening values for the cool companion …

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