On the nature of early-type emission line objects in NGC6611
Christophe Martayan (GEPI), Michele Floquet (GEPI), Anne-Marie Hubert, (GEPI), Juan Fabregat, Yves Fremat, Dietrich Baade (ESO), Coralie Neiner, (GEPI)
TL;DR
This study clarifies the true nature and number of emission line stars in NGC6611, identifying mainly Herbig Be stars through advanced spectroscopic observations that disentangle circumstellar and nebular emissions.
Contribution
The paper employs high-resolution spectroscopic techniques to accurately distinguish true emission line stars from nebular contamination in NGC6611, refining their classification.
Findings
Confirmed a small number of true emission line stars
Identified most as Herbig Be stars
Disentangled circumstellar from nebular emissions
Abstract
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.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomical Observations and Instrumentation · Astronomy and Astrophysical Research