2014A&A...565A..29L


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST00:04:18

2014A&A...565A..29L - Astronomy and Astrophysics, volume 565A, 29-29 (2014/5-1)

Warm gas towards young stellar objects in Corona Australis. Herschel/PACS observations from the DIGIT key programme.

LINDBERG J.E., JORGENSEN J.K., GREEN J.D., HERCZEG G.J., DIONATOS O., EVANS II N.J., KARSKA A. and WAMPFLER S.F.

Abstract (from CDS):

The effects of external irradiation on the chemistry and physics in the protostellar envelope around low-mass young stellar objects are poorly understood. The Corona Australis star-forming region contains the R CrA dark cloud, comprising several low-mass protostellar cores irradiated by an intermediate-mass young star. We study the effects of the irradiation coming from the young luminous Herbig Be star R CrA on the warm gas and dust in a group of low-mass young stellar objects. Herschel/PACS far-infrared datacubes of two low-mass star-forming regions in the R CrA dark cloud are presented. The distributions of CO, OH, H2O, [CII], [OI], and continuum emission are investigated. We have developed a deconvolution algorithm which we use to deconvolve the maps, separating the point-source emission from the extended emission. We also construct rotational diagrams of the molecular species. By deconvolution of the Herschel data, we find large-scale (several thousand AU) dust continuum and spectral line emission not associated with the point sources. Similar rotational temperatures are found for the warm CO (282±4K), hot CO (890±84K), OH (79±4K), and H2O (197±7K) emission in the point sources and the extended emission. The rotational temperatures are also similar to those found in other more isolated cores. The extended dust continuum emission is found in two ridges similar in extent and temperature to molecular millimetre emission, indicative of external heating from the Herbig Be star R CrA. Our results show that nearby luminous stars do not increase the molecular excitation temperatures of the warm gas around young stellar objects (YSOs). However, the emission from photodissociation products of H2O, such as OH and O, is enhanced in the warm gas associated with these protostars and their surroundings compared to similar objects not subjected to external irradiation.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: R CrA - ISM: molecules - astrochemistry

CDS comments: Figs and tables : regions Res N-N not in SIMBAD.

Simbad objects: 22

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Number of rows : 22

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 LDN 1448-mm Y*O 03 25 38.83 +30 44 06.2           ~ 293 0
2 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 241 1
3 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 544 0
4 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 690 0
5 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 612 1
6 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 882 2
7 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 230 2
8 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 119 0
9 NAME SERPENS SMM 3 smm 18 29 59.7 +01 14 00           ~ 82 1
10 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 93 0
11 CHLT 3 * 19 01 48.10 -36 57 22.7           K6V 28 0
12 2MASS J19014846-3657148 Y*O 19 01 48.461 -36 57 14.88           ~ 17 0
13 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 384 0
14 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
15 [NWA2005] SMM 1C mm 19 01 55.28 -36 57 16.6           ~ 23 1
16 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 89 2
17 [CKR2003] MMS 13 smm 19 01 55.5 -36 57 38           ~ 21 0
18 [NWA2005] SMM 1B Y*O 19 01 56.41 -36 57 28.0           ~ 77 1
19 V* T CrA Ae* 19 01 58.7901571143 -36 57 50.329832417     11.67     F0 153 0
20 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 101 1
21 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 213 0
22 [S2006] 37 * 22 39 42.9034424769 +75 08 34.815003448   13.23   11.83   ~ 4 0

    Equat.    Gal    SGal    Ecl

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2019.10.18-00:04:18

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