NOAO >   Observing Info >   Approved Programs >   2017B-0358

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Program Information for 2017B-0358


PI: Chien-Hsiu Lee, Subaru Telescope, leech@naoj.org
Address: 2800 Woodlawn Dr. USA

CoI: Eugene Magnier, U. of Hawaii

Title: RR Lyrae in M33

Abstract: We propose to use the superb etendue delivered by LBC/LBT for a census of RR Lyrae and other short-period variables in M33. A 15-minute integration will yield 5σ sensitivity in the outer halo of 26.95,26.45 mag in Sloan g, r, one magnitude below the mean magnitude of RR Lyrae given the distance of M33 (870kpc). A four half-night campaign (20 hours) with Sloan g and r filters will provide robust determination of periods, amplitude, and sub-type classifications. Our main scientific driver is to use the RR Lyrae to study the giant stream and to identify uncharted tidal debris across the disk of M33. Furthermore, RR Lyrae can serve as probes of the old stellar population (>10 Gyr) and the metallicity, and can shed light on the initial assembly (t > 10 Gyr) of M33’s disk. Beyond RR Lyrae, combining with published CFHT and WIYN data will help to constrain the Cepheid period-luminosity relation at short periods, thereby providing insight into the broken period-luminosity relation and star-formation epochs in M33.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017B):  LBT-SVC/LBC -- 20hrs


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NOAO >   Observing Info >   Approved Programs >   2017B-0358

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