NOAO >   Observing Info >   Approved Programs >   2018A-0166

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Program Information for 2018A-0166


PI: Greg Sloan, STScI, sloan@astro.cornell.edu
Address: 3700 San Martin Drive, Baltimore, MD 21218 USA

CoI: Kathleen E Kraemer, Boston College
CoI: Bart H Dunlap, U. of North Carolina
CoI: Joshua Reding, U. of North Carolina

Title: Resolving Reflection Nebulae around Post-AGB Objects in the LMC

Abstract: We request 2 half-nights with the SOAR Adaptive Optics Module (SAM) to investigate carbon-rich post-Asymptotic Giant Branch (AGB) objects in the Large Magellanic Cloud (LMC). Our eight objects were identified as ``Extremely Red Objects" (EROs) from their {it Spitzer} photometry, and their IRS spectra show them to be deeply embedded carbon-rich objects. They are members of a small set of sources dominating the LMC dust production, and their multi-epoch infrared photometry suggests they are transitioning from the AGB into early stages of planetary nebulae. Carbon-rich post-AGB objects in the Galaxy can show striking bipolar extended emission, especially in reflected light (e.g., the Cygnus Egg and the Westbrook Nebula). Excess blue emission in the EROs suggests that scattered light is escaping these systems, probably because the circumstellar dust is evolving away from spherical symmetry as it is pushed away from the central star. The unique combination of high angular resolution and sensitivity of SAM will enable us to disentangle their morphology, better determine their evolutionary stage, and improve their derived mass-loss rates and luminosities.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018A):  SOAR/SAMI -- 1n on Feb 04 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-0166

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