2006MNRAS.366..739A

Query : 2006MNRAS.366..739A

2006MNRAS.366..739A - Mon. Not. R. Astron. Soc., 366, 739-757 (2006/March-1)

The infrared Hourglass cluster in M8.

ARIAS J.I., BARBA R.H., MAIZ-APELLANIZ J., MORRELL N.I. and RUBIO M.

Abstract (from CDS):

A detailed study of the Hourglass nebula in the M8 star-forming region is presented. The study is mainly based on recent subarcsec-resolution JHKsimages taken at Las Campanas Observatory and complemented with archival Hubble Space Telescope (HST) images and long-slit spectroscopy retrieved from the European Southern Observatory Archive Facility. Using the new numerical code chorizos, we estimate the distance to the earliest stars in the region to be 1.25 kpc. Infrared photometry of all the sources detected in the field is given. From analysis of the JHKscolour-colour diagrams, we find that an important fraction of these sources exhibit significant infrared excess. These objects are candidates to be low- and intermediate-mass pre-main-sequence stars. Based on HST observations, the spatial distribution of gas, dust and stars in the region is analysed. A morphological analysis of these images also reveals a rich variety of structures related to star formation (proplyds, jets, bow shocks), similar to those observed in M16 and M42, along with the detection of the first four Herbig-Haro objects in the region. Furthermore, a long-slit spectrum obtained with the New Technology Telescope confirms the identification of one of them (HH 870) in the core of the Hourglass nebula, providing the first direct evidence of active star formation by accretion in M8.

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

Journal keyword(s): stars: formation - stars: pre-main-sequence - HII regions - ISM: Herbig-Haro objects - ISM: jets and outflows

VizieR on-line data: <Available at CDS (J/MNRAS/366/739): table4.dat>

Nomenclature: Table 4: ABMMR NNN (Nos 1-762).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 46

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Number of rows : 46
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 NGC 604 HII 01 34 32.1 +30 47 01           ~ 586 0
2 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1450 1
3 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1404 1
4 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1357 0
5 V* LL Ori Or* 05 35 05.6361678504 -05 25 19.520320800 12.997 12.309 11.517   10.034 K0-K3e 108 1
6 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
7 M 42 HII 05 35 17 -05 23.4           ~ 4076 0
8 HH 203 HH 05 35 22.2 -05 24 58           ~ 71 4
9 HH 204 HH 05 35 22.6 -05 25 13           ~ 79 4
10 NAME Ori A MoC 05 38 -07.1           ~ 3012 0
11 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1190 2
12 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1014 2
13 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14415 0
14 NGC 6523 Cl* 18 03.2 -24 23           ~ 186 1
15 HH 869 HH 18 03 35.69 -24 22 30.3           ~ 1 0
16 HH 868 HH 18 03 36.00 -24 22 49.0           ~ 1 0
17 HH 867 HH 18 03 36.77 -24 22 33.0           ~ 1 0
18 M 8 OpC 18 03 37 -24 23.2           ~ 614 1
19 2MASS J18033861-2422243 Y*O 18 03 38.6057774352 -24 22 24.264602580     18.476     ~ 5 0
20 NAME Her 36SE SB* 18 03 40.3201232304 -24 22 42.857540472 10.26 11.022 10.372 10.267   O8V+ 194 0
21 CD-24 13806B ** 18 03 40.3545931972 -24 22 39.951170892         15 ~ 13 0
22 GAL 005.97-01.17 HII 18 03 40.51 -24 22 44.4           ~ 33 0
23 2MASS J18034104-2422413 Y*O 18 03 41.0649029952 -24 22 41.409166008     15.039     ~ 8 0
24 NAME Hourglass Nebula ISM 18 03 41.1 -24 22 37           ~ 77 2
25 Cl* NGC 6530 SCB 150 IR 18 03 41.42 -24 22 46.5     14.364     ~ 5 0
26 HH 870 HH 18 03 41.44 -24 23 25.0           ~ 2 0
27 Cl* NGC 6530 SCB 1016 * 18 03 41.454 -24 22 43.64     22.288     ~ 6 0
28 CD-24 13810 Y*O 18 03 45.0958464864 -24 22 05.325003732 9.67 10.180 10.054 10.169 9.54 B1.5V(n) 29 0
29 * 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
30 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
31 NGC 6530 15 Y*? 18 04 01.2551734800 -24 23 47.401378584   11.75 11.58     B7V 15 0
32 NGC 6530 17 Y*O 18 04 04.3106114712 -24 21 30.469104324 12.505 12.155 11.946   11.698 A5-F4V 23 0
33 NGC 6530 OpC 18 04 31 -24 21.5           ~ 417 0
34 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
35 M 16 OpC 18 18 45.1 -13 47 31           ~ 1029 1
36 [CZY2003] S87E ISM 19 46 19.5 +24 35 27           ~ 11 0
37 HH 777 HH 21 40 21.6 +58 15 49           ~ 10 0
38 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 189 1
39 HH 617 HH 22 19 03.0 +63 17 53           ~ 4 0
40 HH 616A HH 22 19 05.9 +63 16 43           ~ 2 0
41 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 658 2
42 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 595 0
43 HH 870A HH ~ ~           ~ 1 0
44 HH 870C HH ~ ~           ~ 1 0
45 HH 870B HH ~ ~           ~ 1 0
46 NAME Galactic Bulge reg ~ ~           ~ 4299 0

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