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Title:
Twenty-Plus Years of Water Maser Spectra and Component Positions in IRAS16293-2422
Authors:
Claussen, Mark J.; Wootten, H. A.; Wilking, B. A.; Marvel, K. B.
Affiliation:
AA(NRAO), AB(NRAO), AC(UMSL), AD(AAS)
Publication:
American Astronomical Society, AAS Meeting #213, #413.09; Bulletin of the American Astronomical Society, Vol. 41, p.221
Publication Date:
01/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21341309C

Abstract

We present the results of a VLA archival study of the water masers near the solar analogue young stellar object IRAS16293-2422, going back to 1985, as well as the results of monitoring these masers with the GBT in 2003 and 2004. We present both spectra (from both the VLA and the GBT), and component positions from the VLA data. We compare the spectra from the VLA and the GBT with published spectra in 1991 and 1992 from the Haystack 37-m (Claussen et al. 1996, ApJS, 106, 111), and also with published spectra from the Nobeyama 45-m (Furuya et al. 2003, ApJS, 144, 71). We further present component positions going back to 1985, using VLA archival data; the positions are accurate to at least the 100 mas level, and in many cases to the 10 mas level. We use the positions and spectra to draw conclusions about the proper motions of the maser sources, and compare this to the motion and evolution of the radio continuum sources as shown by Loinard et al. (2007, ApJ, 670, 1353) and Chandler et al. (2005, ApJ, 632, 371), in order to understand the evolution of this source over the past twenty-plus years.

The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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