Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003adspr..32.1081b&link_type=abstract
Advances in Space Research, Volume 32, Issue 6, p. 1081-1085.
Physics
1
Scientific paper
We have used a 40-ks XMM-Newton observation to examine the X-ray emission of 33 proposed M-type members in. the core of the Pleiades. We reach a limiting X-ray luminosity of LX ~ × 1027 erg s-1 in the field centre and detect 17 of 19 members with MIc < 10.5 (where MIc is absolute magnitude in the Cousins I band, which is centered on 790 nm), and 2 of 14 fainter members. A further possible detection of the brown dwarf candidate Roque 9, with log LX ~ 27.8 and X-ray-to-bolometric luminosity ratio of log(LX/Lbol) ~ -2.5, may be due to a chance alignment with a background source. Although the X-ray luminosity decreases sharply with increasing MIc (later-types, lower-masses), all but 3 members show LX consistent with near-saturated emission and we do not see convincing evidence for a decrease in activity level indicative of a decrease in dynamo efficiency at the spectral type at which stellar structure is expected to become fully-convective.
Briggs Kevin R.
Pye John P.
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