PI: John Lacy, U. of Texas, Austin, email@example.com
Address: Department of Astronomy, 2515 Speedway, C1400, Austin, TX, 78705 USA
CoI: Christopher Sneden, U. of Texas, Austin
CoI: Kevin Luhman, Pennsylvania State U.
CoI: Hwihyun Kim, Gemini Observatory
CoI: Daniel T Jaffe, U. of Texas, Austin
Title: Absorption by H2, CO, and Dust Through Cold Molecular Clouds
Abstract: CO and dust are commonly used as tracers of H2, which must dominate the masses of molecular clouds but is difficult to observe. But the abundances of these tracers relative to H2 have only been measured in the envelopes of a few embedded stars and along four more typical lines of sight through one molecular cloud (Lacy et al. 2017). We propose to observe absorption by H2, CO, and dust along multiple lines of sight through four additional clouds to more accurately determine their relative abundances and their abundance variations within and among clouds. H2 and CO absorption will be measured with IGRINS spectra of stars lying behind the Cha I, Coalsack, Ophiuchus, and Serpens clouds.
Program Type: Standard/Galactic
Run 1 (2018A): GEM-SQ/IGRINS -- 20hrs band 2 (GS-2018A-Q-218 )
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360