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Table 2

Normalized Lyα and X-ray fluxes of M dwarfs.

Star Sp. T. log RLyα log RX(*) σLX (dex) N X

Lyα from HST
Proxima Cen M6v −3.88 −3.58 0.31 10
AD Leo M4.5v −3.50 −3.12 0.12 6
EV Lac M3.5v −3.77 −2.70 0.41 8
AU Mic M1v −3.51 −2.97 0.15 3
GJ 436 M2.5v −4.60 −4.87 0.77§ 3

Lyα from IUE
AX Mic M0v −4.22 −5.29 0.14 3
DT Vir M2v −3.27 −3.15 0.41, 5
GJ 887 M2v −4.05 −5.13 0.15 2
GJ 411 M2v −4.44 −5.05 0.35 4
AD Leo M4.5v −3.58 −3.12 0.12 6
EV Lac M3.5v −2.74 −2.70 0.41 8
YZ CMi M4.5v −3.21 −3.06 0.03, 2
V1216 Sgr M3v −3.34 −4.13 1.10, 3
V998 Ori M3.5v −2.95 −3.08 0.18 2
Proxima Cen M6v −3.58 −3.58 0.31 10

Notes.

(*)

Normalized X luminosities are Rosat values extracted from the Nexxus 2 data base. The dispersion σLX is the standard deviation in the NX measurements found in the Nexxus 2 database. These measurements are derived using (†) Rosat,

(‡)

XMM-Newton, or (†,‡) both.

(§)

The dispersion in the case of GJ 436 is obtained as the standard deviation in the three LX values listed in the text.

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