2008A&A...486..799M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.16CEST10:11:33

2008A&A...486..799M - Astronomy and Astrophysics, volume 486, 799-806 (2008/8-2)

Radio continuum imaging of the R Coronae Austrinae star-forming region with the ATCA.

MIETTINEN O., KONTINEN S., HARJU J. and HIGDON J.L.

Abstract (from CDS):

The aim of this study is to investigate the nature of radio sources associated with young stellar objects (YSOs) belonging to the R CrA cluster. By combining the centimetre radio data with the wealth of shorter wavelength data accumulated recently we wish to refine estimates of the evolutionary stages of the YSOs. The region was imaged at 3, 6, and 20cm using the Australia Telescope Compact Array. Fluxes and spectral indices for the brightest radio sources were derived from these observations. Some of the 3 and 6 cm data were obtained simultaneously, which is useful for reliable spectral index determinations of variable sources. Eight pointlike sources were detected. Seven of them can be assigned to YSOs, which have counterparts in the X-rays, infrared or submm. One of the YSOs, Radio Source 9, is a Class 0 candidate, and another, IRS 7B, is suggested to be in the Class 0/I transition stage. IRS 7B is associated with extended radio lobes at 6 and 20 cm. The lobes may have a gyrosynchrotron emission component, which could be understood in terms of Fermi accleration in shocks. The Class I objects detected here seem to be a mixed lot. One of these, the wide binary IRS 5, shows a negative spectral index, rapid variability, and a high degree of circular polarisation with V/I≃33% on one of the days of observation. These signs of magnetic activity suggest that at least one of the binary components has advanced beyond the Class I stage. The radio source without YSO assigment, Radio Source 5, has been suggested to be a brown dwarf. The radio properties, in particular its persistent strong emission, do not support this classification. The radio characteristics of the detected YSOs roughly agree with the scheme where the dominant emission mechanism changes with age. The heterogeneity of the Class I group can possibly be explained by a drastic decline in the jet activity during this stage, which also changes the efficiency of free-free absorption around the protostar.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: clouds - ISM: individual objects: R CrA cloud - ISM: jets and outflows - radio continuum: ISM

Simbad objects: 24

goto Full paper

goto View the reference in ADS

Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 881 2
2 PMN J1853-3628 Rad 18 53 17.92023201 -36 28 42.1644472           ~ 8 1
3 V* TY CrA Ae* 19 01 40.8312189956 -36 52 33.801844387 10.03 9.92 9.39     B9e 266 0
4 HH 96 HH 19 01 41.31 -37 00 51.1           ~ 14 0
5 [TS84] IRS 2 Y*O 19 01 41.569 -36 58 31.23           K2 78 0
6 CHLT 2 BD? 19 01 43.3 -36 59 12           ~ 9 0
7 HH 97 HH 19 01 45.78 -37 00 01.5           ~ 15 0
8 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 93 0
9 HH 100 HH 19 01 49.1 -36 58 16           ~ 79 0
10 [TS84] IRS 6 Y*O 19 01 50.373 -36 56 39.05           M2 31 0
11 V* V710 CrA Or* 19 01 50.67792 -36 58 09.6132           K7: 114 0
12 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 384 0
13 [WMB97] 185830.2-370122 Y*O 19 01 52.63 -36 57 00.2           ~ 29 0
14 HH 98 HH 19 01 52.83 -36 57 36.2           ~ 14 0
15 V* R CrA Ae* 19 01 53.6850227874 -36 57 08.145519972 12.781 12.651 11.917 11.242 10.412 B5IIIpe 439 1
16 NAME Coronet Cluster Cl* 19 01 54 -36 57.2           ~ 78 1
17 [CT2004] 3 mm 19 01 55.28 -36 57 19.4           ~ 5 1
18 [NWA2005] SMM 1C mm 19 01 55.28 -36 57 16.6           ~ 23 1
19 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 89 2
20 [NWA2005] SMM 1B Y*O 19 01 56.41 -36 57 28.0           ~ 76 1
21 V* T CrA Ae* 19 01 58.7901571143 -36 57 50.329832417     11.67     F0 153 0
22 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 101 1
23 QSO B1933-400 QSO 19 37 16.21735166 -39 58 01.5529907   18.15 19 17.43   ~ 165 2
24 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 918 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...486..799M and select 'bookmark this link' or equivalent in the popup menu


2019.10.16-10:11:33

© Université de Strasbourg/CNRS

    • Contact