2004A&A...428..523C


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.27CET13:03:17

2004A&A...428..523C - Astronomy and Astrophysics, volume 428, 523-533 (2004/12-3)

Near-infrared polarimetric and spectrometric study of the massive star-forming region S87.

CHEN X., YAO Y., YANG J., JIANG Z. and ISHII M.

Abstract (from CDS):

We present JHK' imaging polarimetry for the massive star-forming region S87, and K-band spectrometry from 2.0 to 2.35µm for several infrared sources in the region. The polarimetric patterns of S87E reveal a deeply embedded source (DES-S87) associated with reflection nebulosities. Exciting OH maser and 1.3mm dust continuum emission, the DES-S87 is suggested to be the youngest star in S87 and the driving source of bipolar CO outflow in the region. A blue cavity is discovered in the [J-K'] color image, to the southwest of DES. Radial dependence of polarization degrees in the cavity could be fitted to the slab model of outflows at an inclination of ∼60° out of the plane of the sky (Minchin et al., 1991MNRAS.251..508M). The nebular complex of S87E can be divided into three area. The North nebula, exhibiting a bipolar structure, may represent a bipolar outflow in the northwest-southeast direction. The southwest nebula traces the blueshifted CO outflow and corresponds to the cavity structure discovered in the [J-K'] color image. The nebular structure of S87E suggests a quadrupolar outflow driven by DES-S87. A well-defined centrosymmetric pattern is found in the nebula of S87W with high degrees of polarization, which indicates single scattering off small dust grains in the reflection nebula. The polarimetric vectors around NIRSA show a polarization disk feature oriented in the southeast-northwest direction. Strong Brγ emission and H2 emissions are found in the K-band spectra, indicating the presences of strong stellar wind, envelope/disk, shocked gas, and high-density PDRs in the circumstellar environment of S87E and S87W. According to the K-band spectrum, the mass of DES-S87E is estimated to be 20M.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: S87 - ISM: lines and bands - polarization - stars: formation - instrumentation: polarimeters

Nomenclature: Table 1: [CYY2004] DES-S87E N=1, [CYY2004] Knot A (Nos A-E). Fig.2, Table 2: [CYY2004] AA N (Nos NS 1 to NS 5).

Simbad objects: 18

goto Full paper

goto View the reference in ADS

Number of rows : 18

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 LDN 1287 DNe 00 36 47.5 +63 29 02           ~ 82 0
2 GM 1-33 HH 00 36 47.5 +63 29 02           ~ 110 0
3 HHL 5 HII 03 07 24.2 +58 30 45           ~ 143 0
4 SH 2-233 HII 05 38 31.5 +35 51 19           ~ 59 1
5 SH 2-233 B HII 05 39 13.1 +35 45 50           ~ 5 0
6 [CZY2003] S87W ISM 19 46 13.5 +24 35 32           ~ 5 0
7 [CZY2003] S87E ISM 19 46 19.5 +24 35 27           ~ 10 0
8 [CZY2003] S87W NIRS A IR 19 46 19.5 +24 35 27           ~ 1 0
9 GAL 060.88-00.13 Mas 19 46 20.4 +24 35 25           ~ 11 1
10 SH 2-87 HII 19 46 20.7 +24 35 15           ~ 150 2
11 IRAS 20050+2720 Y*O 20 07 06.549 +27 28 49.10           ~ 98 0
12 NAME IRAS 20050+2720 Cluster Cl* 20 07 06.7 +27 28 53           ~ 83 0
13 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 391 0
14 RAFGL 2591 Y*O 20 29 25.2650 +40 11 26.532   18       ~ 563 5
15 EM* LkHA 234 Ae* 21 43 06.8214472757 +66 06 54.199354231 13.65 13.61 12.73 11.98 11.20 B5Ve 274 0
16 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 630 2
17 IRAS 22176+6303 SFR 22 19 17.978 +63 18 52.92           ~ 588 0
18 HD 223386 PM* 23 48 53.9576553953 +59 58 44.171694257   6.311 6.324     A0V 50 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2004A&A...428..523C and select 'bookmark this link' or equivalent in the popup menu


2020.01.27-13:03:17

© Université de Strasbourg/CNRS

    • Contact