Table 6:
Summary of the properties of the massive YSOs. Columns 2-4:
spectral lines (-: not present, +: present, n: not observed); Col. 5: is the source the counterpart of a radio
UCHII?; Col. 6: spectral evidence for a
circumstellar disk. (+: evidence for a disk); Col. 7: spectral type estimated based on the
position in the CMD (Fig. 1); Col. 8: spectral type
based on the IRAS luminosity of the IRAS source. This is an upper
limit on the spectral type of the massive YSO, as usually more stars
contribute to the IRAS flux. Column 9: spectral type estimate based
on other methods. Column 10: properties of the surrounding cluster,
taken from Kaper et al. (2006). The OB star spectra are discussed in
Bik et al. (2005). References: K94: Kurtz et al. (1994, radio flux UCHII
region); P03: Persi & Tapia (2003, mid-infrared luminosity);
Kpc: Kurtz, private communication (radio flux UCHII region); N84:
Neckel & Staude (1984, optical spectroscopy); C00: Clark & Steele (2000, Br)tex2html_wrap_inline3659# absorption, similarity with Be stars#; C87: Caswell & Haynes (1987, single
dish radio observations and assuming that a single star is
responsible for the ionisation); G02: Gómez et al. (2002);
B03: Barbosa et al. (2003); K01: Karnik et al. (2001).
| (1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
| Object |
CO |
Mg II/ |
Pf |
UCHII |
Disk |
near-IR |
IRAS |
Other |
Cluster |
| |
|
Fe II |
|
|
|
Sp. type |
Sp. type |
Sp. type |
Properties |
| 06058nr227 |
n |
- |
n |
- |
|
B? |
B1V |
|
Cluster member, B1-B2V star found in same cluster. |
| 06058nr221 |
n |
- |
n |
- |
+ |
late B |
B1V |
|
See 06058nr227. |
| 06061nr676 |
n |
- |
n |
+ |
|
B? |
B1V |
B2V (K94) |
Cluster member, B1-B2V star found in same cluster, central source UCHII region. |
| 06084nr118 |
n |
+ |
n |
+ |
|
mid-B |
B1.5V |
>B3 (P03) |
Cluster member (GGD 14), negative radio slope (G02). Red mid-IR SED (P03). |
| 06084nr114 |
n |
- |
n |
- |
|
mid-B |
B1.5V |
|
Cluster member. |
| 06412nr121 |
- |
+ |
+ |
+ |
+ |
mid-O |
O9.5V |
O8V (Kpc) |
Nebular He I emission, ionising |
| |
|
|
|
|
|
|
|
O7V (N84) |
source UCHII; brightest source. |
| 07299nr598 |
- |
- |
- |
- |
|
B2V |
B2V |
late B (C00) |
Likely not related to IRAS source, Be star. |
| 07299nr618 |
+ |
- |
- |
- |
+ |
mid-B |
B2V |
|
Scattered light of more embedded source? |
| 07299nr43 |
+ |
+ |
- |
- |
|
mid-B |
B2V |
|
Blended with 07299nr43. |
| 07299nr314 |
- |
+ |
- |
- |
|
B? |
B2V |
|
Deeply embedded. |
| 08576nr292 |
+ |
- |
- |
- |
+ |
mid-B |
B1V |
|
Located at edge of the cluster, 2 O9V-B1V stars in center. |
| 08576nr408 |
- |
- |
- |
- |
|
early-B |
B1V |
|
See 08576nr292. |
| 11097nr1218 |
+ |
- |
- |
- |
+ |
early-B |
O6V |
|
Located in cluster, not main ionising source, peak of radio emission even more embedded. |
| 11097nr693 |
- |
- |
- |
- |
|
late-O |
O6V |
|
Blue mid-IR SED (B03), located close to 11097nr1218. |
| 15411nr1955 |
- |
+ |
+ |
n |
+ |
mid-O |
O8V |
|
Nebular He I emission, main ionising source H II region. No radio observations available. |
| 16164nr3636 |
+ |
+ |
+ |
n |
+ |
mid-O |
O6V |
>O4V (C87) |
Main ionising source very compact H II region (3.5
 ); nebular He I emission, embedded in massive envelope (K01). |
| 16571nr1281 |
- |
- |
+ |
- |
+ |
early-B |
B0.5V |
>O9V (C87) |
Cluster member, next to O8V-B1V star. |
| 17136nr649 |
- |
- |
- |
- |
|
late-O |
O8V |
|
In center of small cluster (GM24), next to UCHII region |
| 17258nr593 |
- |
+ |
- |
- |
|
early-B |
O8V |
|
|
| 18006nr766 |
+ |
- |
+ |
- |
+ |
mid-B |
O9.5V |
|
Located in M8, next to the ionising source Her 36 (O7V). |
| 18507nr248 |
- |
- |
- |
- |
|
late-O |
O5.5V |
|
Located in cluster, also O5-O6 V star detected |