2006A&A...453..911F


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.29CEST13:59:59

2006A&A...453..911F - Astronomy and Astrophysics, volume 453, 911-922 (2006/7-3)

New signposts of massive star formation in the S235A-B region.

FELLI M., MASSI F., ROBBERTO M. and CESARONI R.

Abstract (from CDS):

We report on new aspects of the star-forming region S235AB revealed through high-resolution observations at radio and mid-infrared wavelengths. Using the Very Large Array, we carried out sensitive observations of S235AB in the cm continuum (6, 3.6, 1.3, and 0.7) and in the 22 GHz water maser line. These were complemented with Spitzer Space Telescope Infrared Array Camera archive data to clarify the correspondence between radio and IR sources. We made also use of newly presented data from the Medicina water maser patrol, started in 1987, to study the variability of the water masers found in the region. S235A is a classical HII region whose structure is now well resolved. To the south, no radio continuum emission is detected either from the compact molecular core or from the jet-like structure observed at 3.3 mm, suggesting emission from dust in both cases. We find two new compact radio continuum sources (VLA-1 and VLA-2) and three separate maser spots. VLA-1 coincides with one of the maser spots and with a previously identified IR source (M1). VLA-2 lies towards S235B and represents the first radio detection from this peculiar nebula that may represent an ionized wind from a more evolved star. The two other maser spots coincide with an elongated structure previously observed within the molecular core in the C34S line. This structure is perpendicular to a bipolar molecular outflow observed in HCO+(1-0) and may trace the associated equatorial disk. The Spitzer images reveal a red object towards the molecular core. This is the most viable candidate for the embedded source originating the outflow and maser phenomenology. The picture emerging from these and previous data shows the extreme complexity of a small (≤0.5pc) star-forming region where widely different stages of stellar evolution are present.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: S235A-B - ISM: jets and outflows - radio continuum: ISM - masers

VizieR on-line data: <Available at CDS (J/A+A/453/911): table2.dat>

Nomenclature: Fig.2, Table 2: [FMR2006b] IR NN (Nos 1-15). Fig.5, Table 3: [FMR2006b] VLA N (Nos 1-2). Fig.6, Table 4: [FMR2006b] H2O-N (Nos 1-3).

Simbad objects: 35

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Number of rows : 35

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5633 4
2 2MASS J05405170+3541570 Y*O 05 40 51.70 +35 41 57.0           ~ 2 0
3 2MASS J05405219+3541415 Y*O 05 40 52.1931293937 +35 41 41.730436474           ~ 2 0
4 [FMR2006b] IR 11 IR 05 40 52.2 +35 41 55           ~ 1 0
5 SH 2-235 B HII 05 40 52.366 +35 41 29.43   17       ~ 171 1
6 NAME SH 2-235 A-B VLA 2 Rad 05 40 52.4 +35 41 30           ~ 2 0
7 2MASS J05405263+3541456 Y*O 05 40 52.6398667847 +35 41 45.695069284           ~ 2 0
8 [FMR2006b] IR 15 IR 05 40 52.7 +35 41 52           ~ 1 0
9 [CAB2014] S235 702 Y*O 05 40 52.7585176240 +35 42 18.527602542           ~ 5 0
10 [DA2011] s4 Y*O 05 40 53.02 +35 41 53.4           ~ 2 0
11 [FMR2006b] H2O-1 Mas 05 40 53.27 +35 41 50.0           ~ 1 0
12 SH 2-235 A HII 05 40 53.333 +35 42 22.29           ~ 50 1
13 JCMTSF J054053.3+354148 Mas 05 40 53.38 +35 41 48.6           ~ 3 0
14 NAME SH 2-235 A-B mm Core mm 05 40 53.4 +34 41 50           ~ 2 0
15 NAME SH 2-235 A-B MIR Y*O 05 40 53.44 +35 41 48.8           ~ 6 0
16 [CAB2014] S235 729 Y*O 05 40 53.460 +35 41 52.88           ~ 3 0
17 [CAB2014] S235 733 Y*O 05 40 53.573 +35 41 42.80           ~ 7 0
18 NAME SH 2-235 A-B VLA 1 Rad 05 40 53.6 +35 41 43           ~ 3 0
19 [FMR2006b] H2O-2 Mas 05 40 53.63 +35 41 43.0           ~ 1 0
20 [DA2011] s6 Y*O 05 40 53.6677513787 +35 41 47.302039216           ~ 4 0
21 [DA2011] s1 Y*O 05 40 53.7077812290 +35 41 56.196559249           ~ 2 0
22 2MASS J05405376+3541271 Y*O 05 40 53.7703133136 +35 41 27.132713935           ~ 3 0
23 [CAB2014] S235 750 Y*O 05 40 53.959 +35 41 41.67           ~ 3 0
24 2MASS J05405420+3541598 Y*O 05 40 54.20 +35 41 59.8           ~ 2 0
25 2MASS J05405433+3541292 Y*O 05 40 54.33 +35 41 29.3           ~ 3 0
26 SH 2-235 HII 05 41.1 +35 50           ~ 190 0
27 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1275 1
28 NVSS J055840+394852 Rad 05 58 40.24 +39 48 52.2           ~ 3 1
29 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 331 1
30 Caswell OH 032.74-00.07 Mas 18 51 20.0 -00 11 51           ~ 11 0
31 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 463 0
32 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 398 0
33 NAME SH 2-235 A-B NNW-SSE Outflow PoC ~ ~           ~ 3 0
34 NAME SH 2-235 A-B NE-SW Outflow PoC ~ ~           ~ 3 0
35 [FMN2004] C19 PoC ~ ~           ~ 2 1

    Equat.    Gal    SGal    Ecl

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2020.09.29-13:59:59

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