NOAO >   Observing Info >   Approved Programs >   2017B-0803

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Program Information for 2017B-0803


PI: David Sanmartin, Gemini Observatory, dsanmartim@gemini.edu
Address: Gemini Observatory, Colina El Pino s/n, La Serena Chile

CoI: Alexandre Roman-Lopez, Universidad de La Serena
CoI: Gabriel Franco, Universidade Federal de Minas Gerais (UFMG)

Title: Opening the treasury box: GMOS-N IFU observations of 100 to 300 solar masses stars in the Andromeda galaxy

Abstract: Very massive stars (VMS) are key actors in the energy balance and chemical evolution of galaxies. One of the most fundamental yet still non-answered question in astrophysics is related to the formation and evolution of VMS, as the basic processes leading to their formation still remain unknown, probably because they evolve much fast, and also are very short lived objects. During a long time the O3 stars were considered as the most massive hydrogen core burning stellar objects known. However this has changed as we now know that some hydrogen-rich nitrogen sequence WR stars are in reality extremely massive and luminous main-sequence stars, which because the proximity to the Eddington limit, present emission-line spectra even at their early beginning on the main-sequence evolutionary phase, making them the most massive early-type stars in the local universe. Only a few VMS still in their hydrogen core burning phase are known, with the majority of them being found in the very young star-burst clusters R136 in the Large Magellanic Cloud, and NGC 3603 in the Galaxy. In this proposal we aim to obtain GMOS-IFU observations of the most massive members of a very young star cluster of the Andromeda Galaxy, that seems to be quite young with the earliest members presenting probable initial masses of 100-300 Msun in excess, a result that if confirmed could represent one of the most massive hydrogen core burning population of the local universe.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017B):  GEM-NQ/GMOSN -- 4.4hrs band 3 (GN-2017B-Q-74)


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NOAO >   Observing Info >   Approved Programs >   2017B-0803

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