Table 2
Measured emission lines from LTT 1445A with HST/COS.
| Grating | Total exposure time | Line | Line centers(a) | log10(Surface flux)(b) | log10(T )(a) | ||
|---|---|---|---|---|---|---|---|
| (s) | (Å) | (erg cm−2 s−1) | |||||
| FUV | G130M | 7657 | C III (*) | 1174.933, 1175.263, 1175.711, 1175.987, 1176.37 | 2.99 ± 0.12 | 4.9 | |
| Si III (*) | 1206.555 | 2.85 ± 0.07 | 4.8 | ||||
| N V (*) | 1238.821, 1242.804 | 2.99 ± 0.06 | 5.3 | ||||
| Si II (*) | 1264.738 | 1.99 ± 0.29 | 4.5 | ||||
| C II (*) | 1334.532, 1335.707 | 3.10 ± 0.06 | 4.6 | ||||
| G160M | 6830 | O V | 1371.296 | 1.73 ± 0.66 | 5.4 | ||
| Si IV (*) | 1393.755, 1402.772 | 2.95 ± 0.14 | 4.9 | ||||
| O IV | 1401.163 | 1.84 ± 0.64 | 5.1 | ||||
| C IV (*) | 1548.187, 1550.775 | 3.61 ± 0.09 | 5.1 | ||||
| He II | 1640.474 | 3.20 ± 0.19 | 4.9 | ||||
| Al II | 1670.788 | 2.89 ± 0.34 | 4.5 | ||||
| NUV | |||||||
| G230L | 540 | Mg II (*) | 2796.350, 2803.531 | 4.79 ± 0.08 | 4.2 | ||
Notes. Lines marked with an asterisk(*) are used to compute the DEM function (see Sect. 4.4 and Fig. 11). (a)Values from CHIANTI database v10.1 (Dere et al. 2023) (b)Surface fluxes (erg cm−2 s−1) were calculated by scaling the observed flux by the distance d and stellar radius Rs of LTT 1445A: Fsurf = Fobs × (d/Rs)2. For multiple lines, we report the combined surface flux.
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