Science Meeting: Yes

User Meeting: No

NGO Staff Meeting: No

Presentation: Yes

Format: Poster

Title: Young stellar groups in the CMa R1 star forming cloud

Co-author: J. Gregorio-Hetem(1), G. Rojas (1), T. Montmerle (2), N. Grosso (2)

Co-authors' Institutions: (1) IAG/USP (2) Observatoire de Grenoble

Abstract:

This project is related with the study of the nature of X-ray sources associated to the Canis Majoris (CMa R1) star forming region. Most of the ROSAT sources show properties of low- and intermediate-mass pre-main sequence stars: point-like sources are T Tauri and Herbig Ae/Be stars, while extended emission could be due to unresolved young stellar clusters. In order to verify if extend features were possibly truly diffuse emission, associated with an old supernova remnant, we obtained XMM observations of CMa R1. The data revealed 61 X-ray sources, spatially distributed in stellar groups previously unresolved by ROSAT. The correlation of near-IR counterparts with these X-ray sources indicates that they are probably young stars. Aiming to confirm the nature of these objects, multi-object spectroscopy was performed in 4 fields covering most of the clusters. Using GMOS South, spectra were obtained for 83 stars, most of them identified with X-ray sources. The R600 grating was used! to provide the adequate spectral resolution and to cover two spectral ranges containing the Halpha (656.2nm) and Li (670.8nm), which confirms the young nature of the objects.