A very long baseline interferometry detection of the class I protostar IRS 5 in Corona Australis

Author(s)

A. T. Deller, J. Forbrich, L. Loinard

Abstract

Aims: Very long baseline interferometry yields physical

constraints on the compact radio emission of young stellar objects. At

the same time, such measurements can be used for precise astrometric

measurements of parallaxes and proper motions. Here, we aimed to make

the first detections of very compact radio emission from class I

protostars in the Corona Australis star-forming region. Methods:

We have used the Long Baseline Array (LBA) to observe the protostars IRS

5 and IRS 7 in the Corona Australis star-forming region in three

separate epochs. Results: We report the first firm radio

detection of a class I protostar using very long baseline

interferometry. We have detected the previously known non-thermal source

IRS 5b, part of a binary system. IRS 5a and IRS 5N were undetected, as

were all sources in the IRS 7 region. Conclusions: These results

underline the unusual nature of IRS 5b as a genuine protostar with

confirmed non-thermal radio emission. Also, these observations highlight

the potential of the LBA as a tool to provide precision astrometric

measurements of individual young stellar objects in southern

star-forming regions that are not accessible to the Very Long Baseline

Array in the northern hemisphere.

Organisation(s)

Department of Astrophysics

External organisation(s)

Harvard-Smithsonian Center for Astrophysics, Max-Planck-Institut für Radioastronomie, Netherlands Institute for Radio Astronomy (ASTRON), Universidad Nacional Autonoma de Mexico

Journal

Astronomy & Astrophysics

Volume

552

No. of pages

5

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361/201321085

Publication date

04-2013

Peer reviewed

Yes

Austrian Fields of Science 2012

103004 Astrophysics, 103003 Astronomy

Keywords

Portal url

https://ucrisportal.univie.ac.at/en/publications/9c21668b-8ddc-4114-8275-6b8337e0db68