English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The effects of external irradiation on the chemistry and physics in theprotostellar envelope around low-mass young stellar objects are poorlyunderstood. The Corona Australis star-forming region contains the R CrA darkcloud, comprising several low-mass protostellar cores irradiated by anintermediate-mass young star. We study the effects on the warm gas and dust ina group of low-mass young stellar objects from the irradiation by the youngluminous Herbig Be star R CrA. Herschel/PACS far-infrared datacubes of twolow-mass star-forming regions in the R CrA dark cloud are presented. Thedistribution of CO, OH, H2O, [C II], [O I], and continuum emission isinvestigated. We have developed a deconvolution algorithm which we use todeconvolve the maps, separating the point-source emission from the extendedemission. We also construct rotational diagrams of the molecular species. Bydeconvolution of the Herschel data, we find large-scale (several thousand AU)dust continuum and spectral line emission not associated with the pointsources. Similar rotational temperatures are found for the warm CO ($282\pm4$K), hot CO ($890\pm84$ K), OH ($79\pm4$ K), and H2O ($197\pm7$ K) emission,respectively, in the point sources and the extended emission. The rotationaltemperatures are also similar to what is found in other more isolated cores.The extended dust continuum emission is found in two ridges similar in extentand temperature to molecular mm emission, indicative of external heating fromthe Herbig Be star R CrA. Our results show that a nearby luminous star does notincrease the molecular excitation temperatures in the warm gas around a youngstellar object (YSO). However, the emission from photodissociation products ofH2O, such as OH and O, is enhanced in the warm gas associated with theseprotostars and their surroundings compared to similar objects not sufferingfrom external irradiation.

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