NOAO >   Observing Info >   Approved Programs >   2018A-0438

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Program Information for 2018A-0438


PI: Danny Milisavljevic, Purdue U., dmilisav@purdue.edu
Address: Physics Department, 525 Northwestern Avenue, West Lafayette, IN 47907 USA

CoI: Kyle Crabtree, UC Davis
CoI: Sommer Johansen, UC Davis
CoI: Charles Law, Harvard-Smithsonian Center for Astrophysics
CoI: Brody Conner, Purdue U.

Title: WIYN Survey of Variable Diffuse Interstellar Bands

Abstract: Identification of the carriers of the diffuse interstellar bands (DIBs) is one of the biggest current challenges in astronomical spectroscopy. DIBs are recognized as a major reservoir of organic material in the Galaxy, yet---enigmatically---continue to represent some 500 absorption lines with central wavelengths that do not correspond with the spectral lines of any known ion or molecule despite nearly a century of observational, theoretical and laboratory work. We recently discovered evidence of short-timescale ($approx$days) variations in DIBs observed in a spectroscopic survey of massive stars conducted with the 1.5m Tillinghast telescope and TRES instrument. These changes are potentially consistent with interactions between stellar winds and DIB carriers in close proximity, and can be modeled to probe the poorly understood physical characteristics of DIB carriers. We request WIYN+Hydra to obtain moderate resolution ($R>5000$), high signal-to- noise ($> 100$) spectra of $approx 100$ stars in an OB association over multiple epochs to further investigate this finding and test a specific prediction that variability may be observed in the DIB 4428 feature.

Program Type: Purdue

Scheduled Nights:
Run 1 (2018A):  WIYN/HYDR -- 1n on May 14 - May 15 2018
Run 2 (2018A):  WIYN/HYDR -- 0.5n on May 16 2018


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2018A-0438

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