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The Pre-cataclysmic Binary HS 1136+6646 May Have a Companion

James Liebert·Kurtis A. Williams·J. B. Holberg·D. K. Sing
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Abstract

Because of the similarity of the primary star of HS 1136+6646 to the planetary nebula central star BE Ursae Majoris, we did wide field imaging of the former with an H-alpha filter. No nebulosity was detected. On the other hand, the point spread function of the star appeared extended. A partially-resolved red component is detected in the image with the five-band Sloan Digital Sky Survey. Most importantly, a companion is easily resolved in the HST acquisition image for the published STIS observation. A companion to the pre-cataclysmic binary is present at a separation of 1.349'' at position angle 54.4 deg. Evidence indicates that it is likely of K spectral type. We cannot demonstrate conclusively that this component has common proper motion with the close binary. However, the similar apparent z magnitudes and spectral types of HS 1136+6646B and the resolved component make it likely that we have in reality a hierarchial triple system. In any case, the presence of this component needs to be taken into account in future ground-based studies.

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James Liebert, Kurtis A. Williams, J. B. Holberg, D. K. Sing. 2006-09-25. The Pre-cataclysmic Binary HS 1136+6646 May Have a Companion. https://doi.org/10.1086/509664

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