ner_tags: O O O B-Person I-Person O B-Person I-Person O O O B-Wavelength O O O O O O O O O B-Person I-Person O O O B-Wavelength O O O B-Person O O O O B-Organization B-Grant I-Grant I-Grant I-Grant O O O B-Person O B-Grant
tokens: The authors thank Catherine Espaillat and Lynne Hillenbrand for providing the optical spectra and physical parameters of a few objects, and John Kwan for providing the mid-IR hydrogen line ratios. E.R. is supported by the NASA's Astrophysics Data Analysis Program research grant to I.P. (ID: NNX11AG60G).