EDP Sciences
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Volume 383, Number 1, February III 2002
Page(s) 244 - 266
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20011631

A&A 383, 244-266 (2002)
DOI: 10.1051/0004-6361:20011631

Long-term study of water maser emission associated with young stellar objects

I. The database
R. Valdettaro1, F. Palla1, J. Brand2, R. Cesaroni1, G. Comoretto1, M. Felli1 and F. Palagi3

1  Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
2  Istituto di Radioastronomia CNR, Via Gobetti 101, 40129 Bologna, Italy
3  C.A.I.S.M.I.-CNR, Largo E. Fermi 5, 50125 Firenze, Italy

(Received 28 May 2001 / Accepted 15 November 2001 )

We present the results of more than 10 years of monitoring of the water vapor maser emission in 14 star forming regions obtained with the Medicina 32-m radiotelescope. The sample of objects covers a large range of luminosities of the associated FIR sources. In order to present in a compact and representative way the large amount of data available, we give for each source: a time-velocity-flux density plot, the time dependent integrated flux, the lower and upper envelopes of the maser emission, the frequency of the maser occurrence as a function of velocity, and the mean velocity averaged over the observing period. A brief morphological description of the environment of the maser source is also given. The present data form the basis for a discussion of the main properties of the water vapor maser emission to be presented in a forthcoming paper.

Key words: masers -- radio lines: interstellar -- ISM: molecules

Offprint request: R. Valdettaro, rv@arcetri.astro.it

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