tokens: We gratefully acknowledge the contributions of the large team of HPOL and WUPPE observers from the University of Wisconsin who helped to acquire and reduce these data. The relocation and refurbishment of HPOL was supported in part by a Small Research Grant from the American Astronomical Society and by funding from the Dunham Fund for Astrophysical Research. Observations with HPOL at Ritter Observatory have been supported by NSF grant no. AST-1412135 (KSB/JEB), the Helen Luedtke Brooks Endowed Professorship (KSB), and the Scott Smith Fund for Research at Ritter Observatory. We thank the Ritter observing team for help with acquiring observations. We also thank G. Peters and A.M. Magalhães for helpful discussions in the early stages of this project. ACC acknowledges support from CNPq (grant no. 307594/2015-7) and FAPESP (grant no. 2015/17967-7). This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract no. NAS5-26555. Support for MAST for non- HST data is provided by the NASA Office of Space Science via grant no. NNX09AF08G and by other grants and contracts.
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