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Table 3

Spectra of late-type stars that are potential RSGs (L> 4 × 104 L⊙ for a distance of 4.6 kpc).

ID RA(J2000) Dec(J2000) Spectral type Comment
Instr. EW(CO) Sp[RGB] Teff[RGB]* Sp[RSG] Teff[RSG]* H2O+
[hh mm ss] [deg mm ss] [AA] [K] [K] [%]
39 18 32 36.02 −9 08 03.5 SofI 29 M5 3450 ± 203 K5 3869 ± 137 8
40 18 33 08.89 −9 08 32.6 SofI 33 – 3223 ± 226 M0 3790 ± 124 11 IRAS 18303−0910
41 18 33 13.90 −9 06 23.2 SofI 23 M1 3745 ± 130 K3 3985 ± 121 0
42 18 33 15.02 −9 08 32.2 SofI 23 M1 3745 ± 130 K3 3985 ± 121 10
43 18 33 35.24 −8 47 57.7 SofI 32 – 3223 ± 226 M0 3790 ± 124 18 BGa
44 18 33 37.80 −9 21 38.1 SofI 21 M0 3790 ± 124 K2 4049 ± 131 8
45 18 33 40.98 −9 03 25.2 SofI 26 M3 3605 ± 120 K3 3985 ± 121 −16
46 18 34 10.36 −9 13 52.9 SINFONI 64 – 3223 ± 226 M3 3605 ± 120 −76 [MFD2010]8b
47 18 34 23.17 −8 48 38.6 SINFONI 61 – 3223 ± 226 M2 3660 ± 140 −6
48 18 34 33.86 −8 44 21.2 SINFONI 47 M6 3336 ± 226 K5 3869 ± 137 −16
[MFD2010] 5 18 34 09.86 −9 14 23.8 SINFONI – – 3223 ± 226 M1.5 3710 ± 152 – [MFD2010] 5b
BD−08 4635 18 34 51.88 −8 36 40.8 SINFONI – – 3223 ± 226 M2 3660 ± 140 – BD−08 4635c
BD−08 4639 18 35 31.06 −8 41 23.4 SINFONI – – 3223 ± 226 K2 4049 ± 131 – BD−08 4639c
BD−08 4645 18 36 21.66 −8 52 40.0 SINFONI – – 3223 ± 226 M2 3660 ± 140 – BD−08 4645c

Notes. Identification numbers are followed by celestial coordinates, instrument, EW(CO)s, spectral types, Teff , H2O indexes, and comments. Two spectral types are reported; the first was obtained using the relation for red giants (Sp[RGB]), the latter using that for red supergiants (Sp[RSG]). We appended to the table RSG [MFD2010]5 (Messineo et al. 2010), RSG BD−08 4645, BD−08 4635, and BD−08 4639 (Skiff 2013).

(*)

Temperature errors account for accuracy in spectral types of ±2.

(+)

The H2O index depends on the correction for AKs; a variation of 10% in AKs typically affects the H2O by 20%.

(a)

BG = object in the background of the cloud.

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