Sleuthing X-ray Emission in Very Low Mass Dwarfs: Spectroscopy of VB 10

Details Sleuthing X-ray Emission in Very Low Mass Dwarfs: Spectroscopy of VB 10 Sleuthing X-ray Emission in Very Low Mass Dwarfs: Spectroscopy of VB 10

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..153o&link_type=abstract

XMM-Newton Proposal ID #05040101

Physics

Stars, White Dwarfs, Solar System, Vb 10, Xmm-Newton Proposal 05040101

Scientific paper

The bulk of very low mass stars with X-ray detections in quiescence show a marked decline in chromospheric and coronal activity past a spectral type of M7, some objects display these emissions, suggesting a decrease in chromospheric and coronal heating efficiencies. Previous X-ray investigations have focussed mostly on detections, revealing evidence for low coronal temperatures. Yet, among active and inactive earlier spectral type M dwarfs, X-ray spectra show the presence of hot coronal plasma, thought to be related to the unknown coronal heating mechanism. We propose an observation with XMM-Newton to investigate the spectral distribution of coronal plasma in the M8 dwarf VB 10 as a way to constrain the coronal heating processes taking place in very low mass dwarfs.

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