NOAO >   Observing Info >   Approved Programs >   2019B-0498

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Program Information for 2019B-0498


PI: Constantine Deliyannis, Indiana U., con@astro.indiana.edu
Address: Astronomy Department, 319 Swain West, 727 E 3rd St., Bloomington, IN 47405-7105 US

CoI: Qinghui Sun, Indiana U.
CoI: Barbara Anthony-Twarog, U. of Kansas
CoI: Bruce A Twarog, U. of Kansas
CoI: Dianne Harmer, KPNO
CoI: Aaron Steinhauer, State University of New York Geneseo

Title: Stellar Physics via Li in M67, NGC 2158, and M41

Abstract: We propose to continue our WIYN/Hydra survey of open cluster Li abundances (A(Li), using the Li I line at 6708) as a probe of physical mechanisms occurring inside stars. These studies are not only fundamental for stellar interiors, but also address the (arguably) even more fundamental question of how normal (or abnormal) our Sun might be. During 2019B we propose to: a) continue (and with good weather complete) data acquisition of solar-mass dwarfs in M67 ; b) continue (and with good weather complete) a determination of gravity (used as a mass proxy) of a new class of Li-rich stars we discovered in NGC 2158, to try to discern the Li-production mechanism; c) if time permits, begin a survey of dwarfs in the rich, low-reddening, nearby, 300-400Myr-old OC M41. This cluster, together with the similarly-aged M48 (which we have observed previously) is expected to yield insights on all aspects of dwarf Li depletion (the formation of the hot side, center, and cool side of the Li dip; the halo-like Li plateau; and G dwarf Li depletion, to list a few). Note that we began the M67 and NGC 2158 projects during time during 2018B and 2019A. But because the time was poorly scheduled (due to when Hydra was available) and the weather was less than optimal, additional time is required. Most of these projects will comprise an integral part of Qinghui's thesis.

Program Type: ITAC

Scheduled Nights:
Run 1 (2019B):  WIYN/HYDR -- 7n on Sep 07 - Sep 08 2019, Jan 16 - Jan 18 2020, Jan 21 - Jan 23 2020


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 >   2019B-0498

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