SIMBAD references

2011A&A...536A..31R - Astronomy and Astrophysics, volume 536A, 31-31 (2011/12-1)

A multi-epoch XMM-Newton campaign on the core of the massive Cygnus OB2 association.


Abstract (from CDS):

CygOB2 is one of the most massive associations of O-type stars in our Galaxy. Despite the large interstellar reddening towards Cyg OB2, many studies, spanning a wide range of wavelengths, have been conducted to more clearly understand this association. X-ray observations provide a powerful tool to overcome the effect of interstellar absorption and study the most energetic processes associated with the stars in Cyg OB2. We analyse XMM-Newton data to investigate the X-ray and UV properties of massive O-type stars as well as low-mass pre-main sequence stars in Cyg OB2. We obtained six XMM-Newton observations of the core of Cyg OB2. In our analysis, we pay particular attention to the variability of the X-ray bright OB stars, especially the luminous blue variable candidate Cyg OB2 #12. We find that X-ray variability is quite common among the stars in Cyg OB2. Whilst short-term variations are restricted mostly to low-mass pre-main sequence stars, one third of the OB stars display long-term variations. The X-ray flux of Cyg OB2 #12 varies by 37%, over timescales from days to years, whilst its mean log(LX)/(Lbol) amounts to -6.10.These properties suggest that Cyg OB2 #12 is either an interacting-wind system or displays a magnetically confined wind. Two other X-ray bright O-type stars (MT91516 and CPR2002A11) display variations that suggest they are interacting wind binary systems.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Cyg OB2 - stars: early-type - stars: pre-main sequence - stars: individual: CygOB2 #12 - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/536/A31): table2.dat table4.dat>

Nomenclature: Table 2: [R2011] IDX NNN (Nos 1-199). Table 4: [R2011] IDOM NNN (Nos 1-254).

Simbad objects: 430

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2011A&A...536A..31R and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact