On the nature of early-type emission line objects in NGC6611

Christophe Martayan (1, 2) , Michele Floquet (2) , Anne-Marie Hubert (2) , Juan Fabregat (3) , Yves Fremat (1) , Dietrich Baade (4) , Coralie Neiner (2)

1 ROB - Royal Observatory of Belgium = Observatoire Royal de Belgique
2 GEPI - Galaxies, Etoiles, Physique, Instrumentation
3 Observatorio Astronomico de la Universidad de Valencia
4 ESO - European Southern Observatory

The number and the nature of emission line stars in the young open cluster NGC6611 is still the object of debates. Due to the presence of a strong and variable nebulosity in the cluster, the number of emission line stars is highly depending on the technique and the resolution used for the observations. Thanks to observations with the ESO-WFI, in slitless spectroscopic mode, and with the VLT-GIRAFFE we have been able to disentangle the circumstellar and nebular emissions. We confirm the small number of true emission line objects and we precise their nature: mainly Herbig Be stars.

Mots clés: Emission line stars: Be; Herbig Ae/Be; early type stars; M16; NGC6611

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

Christophe Martayan, Michele Floquet, Anne-Marie Hubert, Juan Fabregat, Yves Fremat, et al.. On the nature of early-type emission line objects in NGC6611. 2007. ⟨hal-00172968v3⟩