2007MNRAS.374.1253A

Query : 2007MNRAS.374.1253A

2007MNRAS.374.1253A - Mon. Not. R. Astron. Soc., 374, 1253-1263 (2007/February-1)

Pre-main-sequence stars in the Lagoon Nebula (M8).

ARIAS J.I., BARBA R.H. and MORRELL N.I.

Abstract (from CDS):

We report the discovery of new pre-main-sequence (PMS) stars in the Lagoon Nebula (M8) at a distance of 1.25 kpc, based on intermediate-resolution spectra obtained with the Boller & Chivens spectrograph at the 6.5-m Magellan I Telescope (Las Campanas Observatory, Chile). According to the spectral types, the presence of emission lines and the lithium λ6708 absorption line, we are able to identify 27 classical T Tauri stars, seven weak-lined T Tauri stars and three PMS emission objects with spectral type G, which we include in a separate stellar class denominated `PMS Fe/Ge class'. Using near-infrared photometry either from the Two-Micron All-Sky Survey or from our own previous work, we derive effective temperatures and luminosities for these stars and locate them in the Hertzsprung-Russell diagram, in order to estimate their masses and ages. We find that almost all of our sample stars are younger than 3x106 yr and span over a range of masses between 0.8 and 2.5 M☉. A cross-correlation between our spectroscopic data and the X-ray sources detected with the Chandra ACIS instrument is also presented.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): techniques: spectroscopic - stars: formation - stars: fundamental parameters - stars: pre-main-sequence

Nomenclature: Table 1: [ABM2007] NN (Nos 1-46).

Simbad objects: 58

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Number of rows : 58
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2334 0
2 NGC 6523 Cl* 18 03.2 -24 23           ~ 186 1
3 2MASS J18033462-2422181 * 18 03 34.6231020048 -24 22 18.235191072           ~ 1 0
4 Cl* NGC 6530 SCB 106 * 18 03 35.29 -24 22 25.7   15.283 14.395   13.365 ~ 3 0
5 M 8 OpC 18 03 37 -24 23.2           ~ 614 1
6 Cl* NGC 6530 SCB 1031 Y*O 18 03 37.8446588904 -24 21 42.411014208     17.985     ~ 4 0
7 2MASS J18033861-2422243 Y*O 18 03 38.6057774352 -24 22 24.264602580     18.476     ~ 5 0
8 Cl* NGC 6530 SCB 1036 Y*O 18 03 38.8018190448 -24 22 35.105404800     18.891     ~ 3 0
9 Cl* NGC 6530 SCB 1018 Y*O 18 03 39.445 -24 23 01.21     18.758     ~ 3 0
10 2MASS J18033991-2423026 Y*O 18 03 39.9123965712 -24 23 02.723713800     19.156     ~ 6 0
11 Cl* NGC 6530 SCB 1032 Y*O 18 03 40.2147541128 -24 22 03.615676392   19.012 18.066   15.341 G5-G9V 10 0
12 NAME Her 36SE SB* 18 03 40.3201232304 -24 22 42.857540472 10.26 11.022 10.372 10.267   O8V+ 194 0
13 2MASS J18034053-2423321 Y*O 18 03 40.5448209120 -24 23 32.232950844   18.760 17.093   15.002 ~ 7 0
14 Cl* NGC 6530 SCB 146 * 18 03 40.7077895064 -24 23 16.299314484   17.712 16.239   14.116 ~ 9 0
15 2MASS J18034104-2422413 Y*O 18 03 41.0649029952 -24 22 41.409166008     15.039     ~ 8 0
16 NAME Hourglass Nebula ISM 18 03 41.1 -24 22 37           ~ 77 2
17 Cl* NGC 6530 SCB 174 Y*O 18 03 43.6339649086 -24 23 39.714543050   18.121 16.690   14.780 ~ 12 0
18 Cl* NGC 6530 SCB 184 Em* 18 03 45.1858557120 -24 23 25.166229612   17.736 16.434 15.881 14.324 F1-F5III 11 0
19 NGC 6530 169 * 18 03 46.9645231536 -24 23 08.903528160   13.300 12.579   11.743 ~ 10 0
20 EM* LkHA 108 Y*? 18 03 50.7590261472 -24 21 10.836157104 12.541 12.137 11.714   11.003 ~ 21 0
21 * 9 Sgr Em* 18 03 52.4450051016 -24 21 38.632254012 5.08 5.97 5.97 5.72 5.70 O4V((f))z 543 0
22 HD 164816 Be* 18 03 56.8425865728 -24 18 45.118050552 6.17 7.006 6.986 8.08 6.989 O9.5V+B0V 152 0
23 Cl* NGC 6530 SCB 284 * 18 03 57.1048092000 -24 17 00.522688776   16.761 15.825   14.499 ~ 3 0
24 V* V1764 Sgr Or* 18 03 58.2584964168 -24 16 49.179488268 18.395 18.356 16.942 16.15 14.995 ~ 9 0
25 Cl* NGC 6530 SCB 388 Em* 18 04 07.8070376688 -24 23 11.420458188   18.067 16.647   14.847 ~ 6 0
26 Cl* NGC 6530 SCB 390 Em* 18 04 07.8302285952 -24 23 12.671157444   17.278 15.990   14.365 ~ 12 0
27 Cl* NGC 6530 SCB 410 Y*O 18 04 09.60888 -24 27 10.8792 19.243 18.236 16.737   14.796 K4-K5V 10 0
28 Cl* NGC 6530 SCB 418 Em* 18 04 10.1990032992 -24 23 22.640088660 19.436 18.069 16.545   14.394 ~ 11 0
29 Cl* NGC 6530 SCB 422 Y*O 18 04 10.5311496000 -24 26 55.830537456 17.692 17.115 15.689 15.194 13.676 ~ 15 0
30 Cl* NGC 6530 SCB 425 * 18 04 11.04 -24 23 30.4   17.689 15.218   11.991 ~ 3 0
31 Cl* NGC 6530 SCB 440 Y*O 18 04 12.4838561544 -24 19 43.023828360 18.606 17.081 15.773   14.076 K0-K2V 16 0
32 2MASS J18041465-2419041 Y*O 18 04 14.6586072888 -24 19 04.090974600   20.141 18.410   15.983 ~ 13 0
33 V* V1775 Sgr Or* 18 04 15.7361475192 -24 19 01.658022204 18.500 16.829 15.505   13.829 ~ 15 0
34 Cl* NGC 6530 SCB 486 Y*? 18 04 15.9032331792 -24 18 46.276127712 19.583 18.811 17.561   15.423 ~ 15 0
35 Cl* NGC 6530 SCB 493 * 18 04 16.3200859968 -24 25 03.079562664   17.112 16.226   15.062 ~ 3 0
36 V* V1778 Sgr Or* 18 04 16.3907947992 -24 24 38.977473420 19.725 18.188 16.771   14.774 G8-K2V 18 0
37 V* V1780 Sgr Or* 18 04 17.39016 -24 19 09.9264 18.574 18.817 17.306   15.122 ~ 15 0
38 Cl* NGC 6530 SCB 531 Y*O 18 04 19.320432 -24 22 54.47928   17.798 16.397 15.379 14.959 K5-K7V 15 0
39 Cl* NGC 6530 SCB 540 Y*? 18 04 20.0361664296 -24 22 48.087149916 18.864 17.389 16.143   14.354 ~ 16 0
40 Cl* NGC 6530 SCB 547 Y*? 18 04 20.3680759800 -24 28 19.421558256 17.857 16.301 14.932   13.205 ~ 15 0
41 Cl* NGC 6530 SCB 552 Y*? 18 04 20.7814897944 -24 28 02.496923148 18.211 16.923 15.355   13.295 ~ 12 0
42 Cl* NGC 6530 SCB 666 Y*? 18 04 29.2407245304 -24 23 43.020296340 18.666 17.849 16.486   14.554 ~ 15 0
43 Cl* NGC 6530 ZW 70A Y*O 18 04 30.8543674368 -24 26 34.629074412 17.09 17.093 15.645   13.807 ~ 10 0
44 Cl* NGC 6530 ZW 70B Y*O 18 04 30.9095480112 -24 26 33.451136988   16.379 15.551   13.822 ~ 14 0
45 V* V1793 Sgr Or* 18 04 30.91824 -24 26 44.8836   18.415 17.072   15.084 ~ 11 0
46 NGC 6530 OpC 18 04 31 -24 21.5           ~ 417 0
47 [ABM2007] 38 * 18 04 34.90 -24 26 43.2           ~ 2 0
48 2MASS J18043493-2426239 * 18 04 34.9369702776 -24 26 23.813245248           ~ 1 0
49 Cl* NGC 6530 SCB 726 Em* 18 04 35.0807934000 -24 26 12.594659712 19.448 18.196 16.781   14.912 ~ 13 0
50 2MASS J18043950-2417203 Y*O 18 04 39.51 -24 17 20.4 22.097 19.230 17.645   15.552 ~ 8 0
51 V* V1800 Sgr Or* 18 04 40.8768634440 -24 17 10.848259716 19.139 18.198 16.740   14.732 ~ 15 0
52 Cl* NGC 6530 SCB 810 Y*? 18 04 43.5151983552 -24 27 38.619388476   18.077 16.265   13.938 K2-K3V 14 0
53 V* V1803 Sgr Or* 18 04 48.508608 -24 26 40.40016   18.437 17.102 16.36 14.946 ~ 8 0
54 EM* LkHA 115 Ae* 18 04 50.5999226472 -24 25 42.095461620   12.380 11.949   11.198 B7e 33 0
55 2MASS J18045174-2425474 * 18 04 51.7207650600 -24 25 47.594147808           ~ 2 0
56 HD 165052 SB* 18 05 10.5506592816 -24 23 54.847798080 6.16 6.98 6.87 7.77   O6.5V((f))z 267 1
57 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 658 2
58 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 595 0

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