Astron. Astrophys. 347, 565-571 (1999)

Flows from young stars in the Serpens star forming region

Rainer Ziener and Jochen Eislöffel ^*

Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

Received 2 March 1999 / Accepted 6 May 1999

Abstract

We have surveyed an area of 3.15 in the Serpens star forming region with the Tautenburg Schmidt telescope in the [SII ]6716,6730 lines searching for outflows from young stars. We find that the outflow activity is mainly concentrated on a region of about 15´ (1.3 pc) diametre around the Serpens Reflection Nebula (SRN). Here, we discovered six new groups of HH objects in addition to the already known HH 106/107, probably forming five or six independent outflows. Much further away from the SRN we observed two more outflows: a newly discovered object about 45´ south of the SRN near a group of nebulous stars, and the known HH 108/109, for which we present also near-infrared molecular hydrogen imaging. We discuss the potential exciting sources for the outflows in the Serpens dark clouds, and the connection between optical HH objects and molecular hydrogen knots observed in this region. We also note that there is only one parsec-scale flow seen among then HH flows in Serpens. We interpret this as the flows breaking rapidly out of their dense parental clouds into the very tenuous surroundings, in which no further shock excitation of the true terminal working surfaces can take place.

Key words: stars: formation stars: winds, outflows ISM: Herbig-Haro objects ISM: jets and outflows

* Visiting astronomer at the ESO/MPG 2.2m telescope at the European Southern Observatory on La Silla, Chile, and the UH 88inch telescope on Mauna Kea, Hawaii.

Send offprint requests to: Rainer Ziener

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Contents

• 1. Introduction
• 2. Observations
• 3. Results
• 4. Discussion
  • 4.1. Exciting sources
  • 4.2. Outflows in Serpens
• 5. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: June 30, 1999
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