2026A&A...707A.118S

Query : 2026A&A...707A.118S

2026A&A...707A.118S - Astronomy and Astrophysics, volume 707A118 (2026/3-1)

Shaping the interstellar medium through expanding H I shells.

SUAD L.A., MOLINA LERA J.A., CARDENAS S.B. and CICHOWOLSKI S.

Abstract (from CDS):

Aims. The goal of this study is to analyse a set of four H I shells and their potential role in triggering star formation.
Methods. We analysed the H I 21-cm line and far-infrared emission distributions to characterize the four shells. To investigate star formation associated with these shells, we identified massive OB-type star candidates using Gaia data and a spectrophotometric method.
Results. The H I characterisation of the four shells reveals that they are expanding structures, with expansion velocities ranging from 6 to 9 km s–1 and kinetic energies between 2.5 × 1048 and 8.4 × 1048 erg. Some of the shells appear to be in collision with each other. The analysis of the IR emission reveals the presence of 28 H II regions seen projected into the borders of the H I shells, some of them located at the interfaces of two shells. The spectrophotometric analysis used to identify ionising star candidates in these regions indicates a distance of 2.7 ± 0.5 kpc for 27 of the H II regions. Since their radio recombination line (RRL) velocities are consistent with the systemic velocities of the H I shells, we can infer that the shells are located at the same distance.
Conclusions. The distribution of 27 H II regions along the borders of four H I shells is consistent with a scenario in which the massive stars responsible for their ionisation may have formed as a consequence of the shells' expansion and, in some cases, their collision.

Abstract Copyright: © The Authors 2026

Journal keyword(s): stars: formation - ISM: bubbles - HII regions - ISM: kinematics and dynamics

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 55

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Number of rows : 55
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
2 LBN 107.64+00.76 HII 22 44.8 +59 53           ~ 10 0
3 BG 2247+59 LP? 22 49 29.0034646608 +59 54 56.182749876           ~ 111 1
4 SH 2-147 HII 22 55.7 +58 28           ~ 30 1
5 SH 2-149 HII 22 56 16.90 +58 31 22.8           ~ 61 1
6 SH 2-148 HII 22 56 18.0 +58 31 00           ~ 70 0
7 WRAM 7 * 22 56 26.4246981576 +58 32 12.762545244 12.52 12.93 12.41 12.31   B1V 7 0
8 TYC 3997-1655-1 * 22 58 33.0191570328 +59 30 15.161513832   12.45 12.85     ~ 1 0
9 LBN 108.78-01.01 HII 22 58 37 +58 46.8           ~ 57 0
10 SH 2-152 HII 22 58 40.8107767416 +58 46 59.226036024           ~ 147 1
11 [RHM2011] 3 * 22 58 42.1975496472 +58 45 32.992894008           B2-3V 3 0
12 [RHM2011] 4 * 22 58 42.2188175808 +58 45 45.861925788           B2-3V 3 0
13 [RHM2011] 5 * 22 58 47.0810936568 +58 46 20.135570520           B2V 3 0
14 HD 240171 * 23 02 44.5113448128 +57 08 33.514353924 9.43 10.02 9.92     B1V 29 0
15 LBN 108.59-02.73 HII 23 03 26.5 +57 13 30           ~ 19 0
16 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 180 2
17 WRAM 17 * 23 05 59.3121541056 +60 15 04.707277992 13.39 13.58 12.92 13.21   ~ 5 0
18 LS III +59 41 * 23 06 13.1486820216 +60 15 32.789158164 10.49 10.80 10.44     OB-e: 9 0
19 V* V807 Cas El* 23 12 12.9830851608 +59 35 59.128293660 10.62 11.13 10.8     B3 38 2
20 2MASS J23133024+6130103 Y*? 23 13 30.2430274824 +61 30 10.334305152           O9.5V+B0.5V 31 0
21 TYC 4279-1463-1 * 23 13 34.3977427416 +61 30 14.637855024   12.76 11.66     O3.5V((f*))+O9.5V 31 0
22 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1
23 LS III +59 52 * 23 14 02.9213342208 +60 14 34.475815104 10.7 11.11 10.7     OB- 9 0
24 LS III +59 54 * 23 14 24.1286010528 +59 54 34.206444216 11.62 11.88 11.4     B2 13 0
25 TYC 4279-562-1 * 23 14 34.6034130336 +60 00 45.717386220   13.29 12.16     ~ 1 0
26 TYC 4010-333-1 * 23 14 37.5721915944 +59 52 41.489532012   12.78 11.80     ~ 1 0
27 EM* GGR 136 Em* 23 14 38.4521777376 +59 51 47.878916472   12.64 11.85     ~ 4 0
28 TYC 4279-1525-1 * 23 14 47.8617918360 +60 40 47.876800980   12.63 12.28     ~ 1 0
29 LS III +59 58 Em* 23 14 48.2388116040 +59 55 19.058481912 10.83 11.38 10.9     B0 17 0
30 TYC 4010-1003-1 * 23 14 54.1724575200 +59 55 26.379081768   12.81 13.00     ~ 2 0
31 Cl Basel 3 1 * 23 14 59.9038731552 +60 27 15.412272660 12.43 12.78 12.33     B1.5V 15 0
32 TYC 4279-1409-1 * 23 15 02.5268858016 +60 00 02.615458860   12.97 12.01     ~ 1 0
33 BD+59 2681 * 23 15 10.0022019240 +59 53 21.400572444 10.3 10.65 10.25     F7: 15 0
34 Cl Mrk 50 31 * 23 15 11.9353998432 +60 26 46.634136396 11.58 11.85 11.09     B2 17 0
35 Cl* Mrk 50 BVC 6 * 23 15 13.2088515840 +60 26 21.676671708   12.50 11.91     B1.5V 5 1
36 Cl Basel 3 30 * 23 15 14.4012884592 +60 26 18.266558136 12.55 12.91 12.42     B2V 14 0
37 Cl Basel 3 25 * 23 15 16.4383416336 +60 26 21.764223276   14.34 13.79     B3V 8 0
38 LS III +60 56 * 23 15 16.6801114608 +60 26 07.239684984 10.7 11.14 10.68     B5 18 0
39 Cl Basel 3 24 * 23 15 18.1084154064 +60 26 05.512537464   14.64 14.04     B8V 8 0
40 SH 2-161 HII 23 15 29.3 +61 51 43           ~ 15 0
41 SH 2-159 Y*O 23 15 31.2384366062 +61 07 10.181362705           ~ 188 1
42 Gaia DR3 2013737855309770752 * 23 15 41.9755691448 +59 56 37.914293472           ~ 1 0
43 LS III +60 57 * 23 15 48.4583566128 +60 18 49.166623944 11.26 11.56 11.0     B1.5 15 0
44 LBN 111.14-00.72 HII 23 16 03.94 +60 02 00.9           ~ 102 2
45 LS III +60 58 bC* 23 16 12.2829489768 +60 27 24.348583116 10.73 11.15 10.663     B0 12 0
46 IRAS 23149+5938 * 23 17 05.6819961792 +59 54 45.830252196           F7 5 0
47 Hilt 1208 bC* 23 17 13.6962757296 +60 00 27.934319268 10.87 11.35 10.9     B2 21 0
48 BSD 19-427 * 23 17 22.9856417736 +59 59 07.240420284   12.46 12.13     A1 3 0
49 BD+59 2692 Pu* 23 17 27.3456058104 +60 14 59.540347752 9.71 10.19 9.849     B2 25 0
50 Gaia DR3 2014997002280223744 Em* 23 17 33.1047722715 +61 55 53.955858722           ~ 2 0
51 V* V1019 Cas cC* 23 17 51.5999636520 +62 08 04.752012480   12.88 11.28     ~ 24 0
52 IRAS 23158+6116 * 23 17 56.9950782360 +61 33 06.520389228           ~ 5 0
53 LS III +60 62 * 23 18 06.2294638008 +60 16 43.423354992 10.66 11.10 10.79     B5 11 0
54 LS III +59 70 * 23 18 39.1586445648 +59 51 56.508019308 11.88 12.28 11.86     B7 10 0
55 LS III +59 71 * 23 19 15.7886846640 +59 58 32.518573968 12.05 12.45 12.1     B3 9 0

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