2003AJ....126.1861B

Query : 2003AJ....126.1861B

2003AJ....126.1861B - Astron. J., 126, 1861-1870 (2003/October-0)

Sh 2-128: an H II and star-forming region in the galactic outback.

BOHIGAS J. and TAPIA M.

Abstract (from CDS):

Near-infrared imaging photometry supplemented by optical spectroscopy and narrowband imaging of the H II region Sh 2-128 and its environment are presented. This region contains a developed H II region and a neighboring compact H II region associated with a pair of water maser sources. Midway between these, the core of a CO cloud is located. The principal ionizing source of Sh 2-128 is an O7 star close to its center. Slit spectroscopy was used to obtain nebular line fluxes, abundances, and the physical parameters of Sh 2-128. This H II region is optically thin from the optical to the radio and appears to be ionization-bounded. The present JHK_simages show the presence of a number of point sources and nebular emission knots with large near-infrared excesses in the northern Sh 2-128N. One of the three red K_sknots coincides with the compact H II region. A few of the infrared-excess objects are close to known mid- and far-infrared emission peaks. Star counts in J and K_sshow the presence of a small cluster of B-type stars, mainly associated with Sh 2-128N. Except for the youngest, reddest objects, the stars in the whole region are moderately obscured. The JHK_sphotometric properties, together with the characteristics of the other objects in the vicinity, suggest that Sh 2-128 and Sh 2-128N constitute a single complex formed from the same molecular cloud but with ages ∼10⁶ and less than 3x10⁵ yr, respectively. A new spectroscopic distance of 9.4 kpc is derived. This implies a galactocentric distance of 13.5 kpc and z=550. No molecular hydrogen emission was detected at 2.12 µm from any part of the surveyed region.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - ISM: individual (Sh 2-128) - Stars: Formation

Nomenclature: Table 4: [BT2003] NN (Nos 1-54), [BT2003] AN (Nos N0-N3).

Simbad objects: 57

Full paper

View the references in ADS

Number of rows : 57

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	LBN 096.23+02.55	HII	21 28 42	+54 37.0					~	54	0
2	[BT2003] 8	*	21 32 07.9089918624	+55 53 46.596128388					~	1	0
3	[BT2003] 40	IR	21 32 08.04	+55 52 28.4					~	1	0
4	2MASS J21320807+5552468	NIR	21 32 08.07	+55 52 46.9					~	1	0
5	2MASS J21320808+5553548	NIR	21 32 08.08	+55 53 54.8					~	1	0
6	[BT2003] 45	IR	21 32 08.97	+55 53 11.0					~	1	0
7	[BT2003] 9	IR	21 32 09.01	+55 52 29.9					~	1	0
8	2MASS J21320913+5552349	NIR	21 32 09.14	+55 52 34.9					~	1	0
9	[BT2003] 41	IR	21 32 09.25	+55 53 08.4					~	1	0
10	[BT2003] 10	IR	21 32 09.29	+55 52 49.6					~	1	0
11	2MASS J21320949+5552446	NIR	21 32 09.4322338608	+55 52 44.085380052					~	1	0
12	[BT2003] 49	IR	21 32 09.52	+55 53 16.5					~	1	0
13	SH 2-128 N	HII	21 32 09.6	+55 53 42					~	6	0
14	[BT2003] 7	IR	21 32 09.61	+55 53 45.0					~	1	0
15	[BT2003] 22	IR	21 32 09.78	+55 53 41.4					~	1	0
16	[BT2003] 16	IR	21 32 09.83	+55 53 47.7					~	1	0
17	[BT2003] 53	IR	21 32 09.87	+55 52 29.1					~	1	0
18	2MASS J21320991+5553362	NIR	21 32 09.8847828632	+55 53 36.016301561					~	1	0
19	SH 2-128	HII	21 32 09.9	+55 52 53					~	173	1
20	[BT2003] 23	IR	21 32 09.98	+55 52 50.3					~	1	0
21	[BT2003] 46	IR	21 32 09.98	+55 54 07.1					~	1	0
22	2MASS J21321005+5553542	NIR	21 32 10.0423530408	+55 53 54.192626880					~	1	0
23	[BT2003] 52	IR	21 32 10.12	+55 53 20.2					~	1	0
24	2MASS J21321015+5552349	NIR	21 32 10.1453685864	+55 52 34.939569324					~	1	0
25	[BT2003] 48	IR	21 32 10.20	+55 53 03.7					~	1	0
26	[BT2003] 12	IR	21 32 10.25	+55 52 46.7					~	1	0
27	ALS 19702	*	21 32 10.3215352416	+55 52 42.511229076	16.94	16.37	14.96	14.82	O7	8	0
28	[BT2003] 24	IR	21 32 10.34	+55 53 27.7					~	1	0
29	[BT2003] 47	IR	21 32 10.61	+55 53 26.4					~	1	0
30	NAME SH 2-128 IRS 2	Y*O	21 32 10.737	+55 53 35.35		12.45	10.34		~	4	0
31	2MASS J21321083+5552372	NIR	21 32 10.84	+55 52 37.2					~	1	0
32	[BT2003] 5	NIR	21 32 11.052	+55 53 11.72					~	1	0
33	[BT2003] 4	*	21 32 11.1783336504	+55 54 06.459899400					~	1	0
34	[BT2003] 6	NIR	21 32 11.1927207336	+55 52 28.144122312					~	1	0
35	[BT2003] 15	IR	21 32 11.30	+55 52 39.6					~	1	0
36	[BT2003] 35	IR	21 32 11.31	+55 53 17.5					~	1	0
37	2MASS J21321134+5553311	NIR	21 32 11.34	+55 53 31.1					~	1	0
38	[BT2003] 11	IR	21 32 11.35	+55 53 39.5					~	1	0
39	[BT2003] 50	IR	21 32 11.81	+55 53 50.6					~	1	0
40	2MASS J21321192+5552566	NIR	21 32 11.9271735624	+55 52 56.897623056					~	1	0
41	[BT2003] 17	IR	21 32 11.93	+55 53 42.6					~	1	0
42	2MASS J21321198+5552259	NIR	21 32 11.9382604776	+55 52 25.558633956					~	1	0
43	[BT2003] 42	IR	21 32 11.94	+55 53 46.0					~	1	0
44	2MASS J21321230+5552473	NIR	21 32 12.3009741048	+55 52 46.623736416					~	1	0
45	[BT2003] 51	IR	21 32 12.54	+55 53 15.4					~	1	0
46	[BT2003] 36	IR	21 32 12.59	+55 54 06.7					~	1	0
47	[BT2003] 20	IR	21 32 12.62	+55 53 45.7					~	1	0
48	[BT2003] 54	IR	21 32 12.62	+55 53 49.3					~	1	0
49	2MASS J21321265+5553592	*	21 32 12.6208253952	+55 53 58.935744096					~	1	0
50	[BT2003] 3	NIR	21 32 13.1682651984	+55 53 08.056074120					~	1	0
51	2MASS J21321360+5552243	NIR	21 32 13.5958421376	+55 52 24.273978312					~	1	0
52	2MASS J21321362+5553279	NIR	21 32 13.6229855448	+55 53 28.021006392					~	1	0
53	2MASS J21321393+5553150	NIR	21 32 13.94	+55 53 15.1					~	1	0
54	2MASS J21321398+5553350	*	21 32 13.9768341864	+55 53 35.054728404					~	1	0
55	2MASS J21321403+5552472	*	21 32 14.0370643272	+55 52 47.521106112					~	1	0
56	[BT2003] 43	IR	21 32 14.10	+55 53 23.9					~	1	0
57	2MASS J21321437+5553069	NIR	21 32 14.38	+55 53 06.9					~	1	0

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