XMM-Newton survey of two Upper Scorpius regions

Details XMM-Newton survey of two Upper Scorpius regions XMM-Newton survey of two Upper Scorpius regions

2006-07-13

arxiv.org/abs/astro-ph/0607298v1

Astronomy and Astrophysics

Astrophysics

27 pages, 15 postscript figures, accepted for publication in Astronomy and Astrophysics. A complete version of the paper, cont

Scientific paper

10.1051/0004-6361:20065674

We study X-ray emission from young stars by analyzing deep XMM-Newton observations of two regions of the Upper Scorpius association, having an age of 5 Myr. Based on near infrared and optical photometry we identify 22 Upper Scorpius photometric members among the 224 detected X-ray sources. We derive coronal properties of Upper Scorpius stars by performing X-ray spectral and timing analysis. The study of four strong and isolated stellar flares allows us to derive the length of the flaring loops. Among the 22 Upper Scorpius stars, 13 are identified as Upper Scorpius photometric members for the first time. The sample includes 7 weak-line T Tauri stars and 1 classical T Tauri star, while the nature of the remaining sources is unknown. Except for the intermediate mass star HD 142578, all the detected USco sources are low mass stars of spectral type ranging from G to late M. The X-ray emission spectrum of the most intense Upper Scorpius sources indicates metal depleted plasma with temperature of ~10 MK, resembling the typical coronal emission of active main sequence stars. At least 59% of the detected members of the association have variable X-ray emission, and the flaring coronal structures appear shorter than or comparable to the stellar radii already at the Upper Scorpius age. We also find indication of increasing plasma metallicity (up to a factor 20) during strong flares. We identify a new galaxy cluster among the 224 X-ray source detected: the X-ray spectrum of its intra cluster medium indicates a redshift of 0.41+/-0.02.

Affiliated with

Also associated with

No associations

Rating

XMM-Newton survey of two Upper Scorpius regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with XMM-Newton survey of two Upper Scorpius regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and XMM-Newton survey of two Upper Scorpius regions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-481492