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Table 2

Spectral indices, distances and spectral types estimated for ten very nearby late-M dwarfs and the VB 8 reference observed at MSSSO-2.3 m.

Name I J K UT observing VOa TiO5 PC3 Distance SpTc Ref.
date (pc)
LHS 234 12.37 10.21 9.31 2008-03-29 0.15±0.03a 9.1±1.3b M6.5 1
SCR J0838−5855 12.77 10.34 9.20 2008-03-29 0.20±0.02a 11.3±1.6b M6.0 2
WT 460 11.77 9.64 8.59 2007-08-04 2.06±0.14 0.20±0.02a 1.22±0.09 10.1±1.3 M5.5 3
PM J14223−7023 11.97 10.15 9.43 2008-03-27 2.02±0.07 0.36±0.08 1.38±0.05 10.0±1.4 M5.0 4
SCR J1546−5534 12.96 10.22 9.14 2008-03-27 2.22±0.15 0.29±0.03 2.05±0.10 5.4±0.7 M8.0 5
PM J17189−4131 12.95 10.55 9.60 2008-03-27 2.10±0.09 0.52d 1.52±0.05 10.5±1.5 M6.0 4
SIPS J1809−7613 11.69 9.87 8.96 2007-08-04 2.02±0.12 0.26±0.03a 1.25±0.06 10.4±1.4 M5.0 6
SCR J1845−6357 12.51 9.52 8.48 2007-08-04 2.21±0.20 0.28±0.03a 2.42±0.18 3.2±0.4 M8.0 7
SCR J1855−6914 12.67 10.46 9.50 2007-08-04 2.10±0.16 0.22±0.02a 1.43±0.09 11.0±1.6 M6.0 8
LEHPM 5031 12.54 10.39 9.54 2007-08-04 2.04±0.11 0.24±0.03a 1.32±0.11 12.5±1.8 M5.5 9
VB 8 12.24 9.74 8.82 2007-08-04 2.15±0.18 0.18±0.01 1.74±0.11 5.8±0.8 M7.0

Notes. The VOa, TiO5 and PC3 indices measured from the low-resolution spectra, except TiO5 for some cases as noted (see Sect. 4.1).

(a)

The TiO5 index measured from medium-resolution spectra.

(b)

Distances estimated from the spectral type versus magnitude relation in Filippazzo et al. (2015).

(c)

An uncertainty of 0.5 subtypes of estimated spectral types.

(d)

An unreliable value, not being used to estimate spectral type.

Reference. References for the source name: (1) Luyten (1979); (2) Finch et al. (2007); (3) Wroblewski & Torres (1991); (4) Lépine (2008); (5) Boyd et al. (2011); (6) Deacon & Hambly (2007); (7) Hambly et al. (2004); (8) Subasavage et al. (2005); (9) Pokorny et al. (2003).

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