Table 2
Basic stellar parameters, silicon abundance, and 28Si/29Si and 28Si/30Si ratios of the K–M giants and optically bright red supergiants in our sample.
| Name | T eff | log 1 | L ⋆ | M ⋆ | MARCS model | |||
| (K) | (cm s-2) | (L⊙) | (M⊙) | Teff /log 1 /M⋆ /νmicro /[Fe/H] | log ASi | 28Si/29Si | 28Si/30Si | |
|
|
||||||||
| K–M giants | ||||||||
| α Boo | 4275 ± 50a | + 1.7 ± 0.1a | 198 ± 3b | 1.1 ± 0.2a | 4250/1.5/1.0/2.0/− 0.5 | 7.5 ± 0.1 | 15 ± 5 | 25 ± 10 |
| γ Cru | 3630 ± 90 | + 0.9 ± 0.1 | 820 ± 80 | 1.5 ± 0.3 | 3600/1.0/1.0/2.0/+0.0 | 7.5 ± 0.2 | 15 ± 5 | 25 ± 10 |
| σ Lib | 3596 ± 100c | +0.7 ± 0.1d |
 c
|
2.2 ± 0.5c | 3600/0.5/1.0/2.0/+0.0 | 7.5 ± 0.2 | 30 ± 10 | 50 ± 20 |
| V806 Cen | 3360 ± 190 | + 0.4 ± 0.2 | 780 ± 80 | 0.8 ± 0.3 | 3400/0.5/1.0/2.0/+0.0 | 7.5 ± 0.3 | 15 ± 5 | 25 ± 10 |
| ε Mus | 3390 ± 190 | + 0.6 ± 0.1 | 1840 ± 190 | 1.5 ± 0.5 | 3400/0.5/1.0/2.0/+0.0 | 7.5 ± 0.3 | 15 ± 5 | 50 ± 20 |
| L2 Pup | 2770 ± 150 | − 0.3 ± 0.2 | 1480 ± 240 | 0.5 ± 0.2 | 2800/0.0/0.5/2.0/+0.0 | – | – | – |
| θ Aps | 2850 ± 160 | − 0.3 ± 0.1 | 3050 ± 460 | 1.0 ± 0.3 | 2800/0.0/1.0/2.0/+0.0 | – | – | – |
|
|
||||||||
| Red supergiants | ||||||||
| α Ori | 3690 ± 54e | − 0.3 ± 0.3f |
 g
|
20 ± 5g | 3600/0.0/5.0/5.0/+0.0† | 7.45i | 20i | 25j |
| α Sco | 3660 ± 120h | −0.2 ± 0.3h |
h
|
15 ± 5h | 3600/0.0/5.0/5.0/+0.0† | 7.44i | 13i | 25j |
| α Her | 3293 ± 100c | + 0.0 ± 1.5d |
c
|
5.0 ± 2.0c | 3300/0.0/5.0/2.0/+0.0 | 7.26i | 20i | 29i |
Notes.The values taken from the literature are marked with references, while the values without notes were derived in the present work as described in Sect. 4.
Reference.
Smith et al. (2013).
Based on the bolometric flux from Lacour et al. (2008) and the parallax from van Leeuwen (2007).
Tsuji (2008).
Derived from the absolute bolometric magnitude, Teff, and M⋆ in Tsuji (2008).
Ohnaka et al. (2011).
Derived from M⋆ and the radius in Harper et al. (2008).
Harper et al. (2008).
Ohnaka et al. (2013).
Tsuji et al. (1994).
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