NOAO >   Observing Info >   Approved Programs >   2019A-0374

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Program Information for 2019A-0374


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

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{AA}) 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. This past winter we completed data acquisition on solar analogs in NGC 188 and on BAFGK dwarfs in M48. During 2019A 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 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 have (poorly scheduled!) time during 2018B to begin these projects. With ideal weather we might expect to complete M67, but more than likely we will need to continue during 2019A. Most of these projects will comprise an integral part of Qinghui's thesis.

Program Type: ITAC

Scheduled Nights:
Run 1 (2019A):  WIYN/HYDR -- 5n on Mar 07 - Mar 09 2019, Mar 27 - Mar 28 2019


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 >   2019A-0374

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