NOAO >   Observing Info >   Approved Programs >   2017A-0271

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Program Information for 2017A-0271


PI: John P Blakeslee, Herzberg Institute of Astrophysics, jpblakeslee@gmail.com
Address: National Research Council of Canada, 5071 West Saanich Road, RR. 5, Victoria, British Columbia, V9E 2E7 Canada

CoI: Michele Cantiello, INAF Osservatorio Astronomico di Teramo
CoI: Charlie Conroy, Harvard U.
CoI: Patrick Cote, Herzberg Institute of Astrophysics
CoI: Laura Ferrarese, Herzberg Institute of Astrophysics
CoI: Joseph Jensen, UVU
CoI: Mischa Schirmer, Gemini Observatory
CoI: Pieter Van Dokkum, Yale U.

Title: Stellar Population GeMology: Long Period Variables at High Metallicity in the Nearest Elliptical Galaxy

Abstract: Stellar evolution during the asymptotic giant branch phase, especially the thermally pulsing asymptotic giant branch (TP-AGB), remains one of the outstanding uncertainties in stellar population synthesis modeling, especially at high metallicities. We have discovered that that the GeMS/GSAOI imaging system can resolve the metal-rich stellar population in the center of the nearby giant elliptical NGC 5128 (Cen A), and have identified an ideal field for GeMS AO observations. Models imply that the field should contain ~3000 TP-AGB stars in the form of Long Period Variables; we propose a multi-epoch short-observation monitoring program to constrain the TP-AGB lifetimes at high metallicities.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017A):  GEM-SQ/GSAOI -- 5hrs band 1 (GS-2017A-Q-29)


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NOAO >   Observing Info >   Approved Programs >   2017A-0271

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