Table 1
Hα, Li I 6708 Å and Na I (8170–8200 Å) equivalent widths of 28 nearby late-M dwarfs.
| DENIS-P name | Other name | SpT | Distance | UT observing | EW Hα | EW Li | EW Na I | References |
| (pc) | date | (Å) | (Å) | (Å) | ||||
|
|
||||||||
| J0041353−562112a | M7.5 | 17.0±2.4 | 2008-03-29 | −16.1±0.4 | <0.2 | 3.3±0.6 | (1) | |
| J0103119−535143 | M5.5 | 24.3±3.7 | 2008-03-29 | −8.9±0.1 | <0.1 | 5.0±0.1 | (1) | |
| J0144318−460432 | M5.5 | 23.3±3.4 | 2005-07-29 | −12.1±0.2 | 0.4±0.1 | 3.5±0.6 | (1) | |
| J0253444−795913 | M5.5 | 17.2±2.4 | 2005-07-29 | −6.5±0.1 | <0.2 | 5.7±0.6 | (1) | |
| J0334113−495333 | M9.0 | 8.2±0.8 | 2005-11-09 | >−0.1 | <0.1 | 6.7±0.1 | (2) | |
| J0351000−005244 | LHS 1604 | M7.0 | 12.8±1.8 | 2006-01-10 | −5.9±0.4 | 1.2±0.2 | 7.6±0.5 | (3) |
| J0410480−125142 | LP 714-37b | M5.5 | 18.1±2.2 | 2008-03-28 | −0.3±0.1 | <0.1 | 7.7±0.4 | (4) |
| J0440231−053009 | LP 655-48 | M7.5 | 8.9±1.3 | 2008-03-28 | −35.2±0.2 | <0.1 | 8.5±0.5 | (3) |
| J0517377−334903 | M8.0 | 12.1±1.8 | 2008-03-28 | −3.9±1.2 | <0.3 | 5.9±0.6 | (1) | |
| J0518113−310153 | M6.5 | 19.5±2.9 | 2008-03-28 | −8.4±0.3 | 0.6±0.3e | 5.8±0.1 | (3) | |
| J0740193−172445 | LHS 234 | M6.5 | 9.1±1.3 | 2008-03-29 | >−0.1 | <0.1 | this paper | |
| J0838022−585558 | SCR J0838−5855 | M6.0 | 11.3±1.6 | 2008-03-29 | −3.2±0.1 | <0.1 | this paper | |
| J1236153−310646 | LP 909-55 | M5.5 | 19.4±2.7 | 2008-03-28 | −8.3±0.2 | <0.1 | 6.2±0.5 | (1) |
| J1357149−143852 | M7.5 | 24.7±3.6 | 2008-03-28 | −5.9±0.9 | <0.1 | 6.2±0.8 | (1) | |
| J1411599−413221 | WT 460c | M5.5 | 10.1±1.3 | 2008-03-28 | −6.2±0.1 | <0.1 | 7.6±0.3 | this paper |
| J1538317−103850 | M5.0 | 31.7±7.0 | 2008-03-28 | −13.1±0.1 | <0.1 | 4.3±0.9 | (3) | |
| J1553571−231152 | LP 860-46 | M5.0 | 21.5±2.9 | 2008-03-28 | −5.5±0.1 | <0.2 | 7.2±0.5 | (3) |
| J1610584−063132 | LP 684-33 | M5.5 | 17.7±2.5 | 2008-03-28 | −3.5±0.1 | <0.1 | 8.3±0.1 | (3) |
| J1809068−761324 | SIPS J1809−7613 | M5.0 | 10.4±1.4 | 2008-03-28 | −4.7±0.1 | 0.5±0.1 | 4.4±0.2 | this paper |
| J1845049−635747 | SCR J1845−6357d | M8.0 | 3.2±0.4 | 2008-03-28 | −2.1±0.1 | <0.1 | 9.0±0.5 | this paper |
| J1855480−691415 | SCR J1855−6914 | M6.0 | 11.0±1.6 | 2008-03-28 | −3.5±0.1 | <0.1 | 7.6±0.3 | this paper |
| J1917045−301920 | LP 924-17 | M5.5 | 22.1±3.1 | 2008-03-28 | −8.5±0.2 | <0.1 | 8.3±0.2 | (3) |
| J2002134−542555 | M6.0 | 17.5±2.5 | 2005-07-29 | −3.4±0.1 | <0.1 | 5.6±0.1 | (1) | |
| J2022480−564556 | M5.5 | 22.9±3.3 | 2008-03-28 | −5.3±0.2 | 0.4±0.1 | 5.0±0.8 | (3) | |
| J2049527−171608 | LP 816-10 | M6.0 | 19.4±5.7 | 2008-03-28 | −5.3±0.2 | <0.1 | 8.6±0.6 | (3) |
| J2132297−051158 | LP 698-2 | M5.5 | 18.5±2.6 | 2005-07-29 | >−0.1 | <0.2 | 5.5±0.2 | (1) |
| J2151270−012713 | LP 638-50 | M5.0 | 18.7±3.1 | 2005-07-29 | −2.8±0.1 | <0.1 | 5.0±0.1 | (1) |
| J2241593−750034 | LEHPM 5031 | M5.5 | 12.5±1.8 | 2008-03-28 | −1.9±0.1 | <0.1 | 8.5±0.8 | this paper |
Notes. The Hα and Li I EWs measured from the medium-resolution spectra, and the NaI EWs measured from low-resolution spectra published in Crifo et al. (2005) and Phan-Bao & Bessell (2006) (see Sect. 4.2).
A young binary of M6.5+M9.0 (Reiners et al. 2010);
a triple system of M5.5+M8.0+M8.5 (Phan-Bao et al. 2005, 2006b);
a binary with photometric spectral types of M6.0+L1 estimated in Montagnier et al. (2006);
a binary of M8.5+T5.5 (Henry et al. 2004; Biller et al. 2006);
Reference. References for spectral type and distance: (1) Phan-Bao & Bessell (2006); (2) Phan-Bao et al. (2006a); (3) Crifo et al. (2005); (4) Phan-Bao et al. (2005).
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