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Observations of water maser sources at Arcetri

Published online by Cambridge University Press:  03 August 2017

Giovanni Comoretto ,
Riccardo Valdettaro ,
Francesco Palla ,
Jan Brand ,
Riccardo Cesaroni ,
Marcello Felli ,
Enzo Natale ,
Francesco Palagi ,
Dario Panella  and
Gianni Tofani
Giovanni Comoretto
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Riccardo Valdettaro
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Francesco Palla
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Jan Brand
Affiliation:
Istituto di Radioastronomia CNR, Via Gobetti 101, I-40129 Bologna, Italy
Riccardo Cesaroni
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Marcello Felli
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Enzo Natale
Affiliation:
CAISMI, C.N.R., Largo E. Fermi 5, I-50125 Firenze, Italy
Francesco Palagi
Affiliation:
CAISMI, C.N.R., Largo E. Fermi 5, I-50125 Firenze, Italy
Dario Panella
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Gianni Tofani
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy CAISMI, C.N.R., Largo E. Fermi 5, I-50125 Firenze, Italy

Abstract

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We present the current activity of the Arcetri group in the field of water masers. This is mainly represented by observations with the Medicina radiotelescope, whose main outcome has been the compilation of the Arcetri Catalog and the study of time variability of selected sources. The Arcetri Catalog update reports the results of the observations carried out from January 1993 to April 2000 on a sample of 300 sources. The global properties of the complete Arcetri Catalog (including Comoretto et al. 1990, and Brand et al. 1994) are discussed. Of the 1013 sources, 937 have an IRAS counterpart within 1 arcmin from the nominal position of the maser. We establish a classification scheme based on the IRAS flux densities which allows to distinguish between water masers associated with star forming regions and late-type stars. The time variability study shows a large variety of behaviors. Generally more luminous sources present less variable emission and spectral components over a wider velocity range.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 39 - 42
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Brand, J., Cesaroni, R., Caselli, P. et al. 1994, A&AS, 103, 541 Google Scholar
Brand, J. Baldacci, L., Engels, D. 2001, in IAU Symp. 206, Cosmic masers, Migenes, V. and Reid, M.J. eds., ASP Conference Series (this conference) Google Scholar
Comoretto, G., Palagi, F., Cesaroni, F., Felli, M., et al. 1990, A&AS, 84, 179 Google Scholar
Valdettaro, R., Palla, F., Brand, J. et al. 2001a, A&A, 368, 845 Google Scholar
Valdettaro, R., Palla, F., Brand, J. et al. 2001b, in IAU Symp. 206, Cosmic masers, Migenes, V. and Reid, M. J. eds., ASP Conference Series (this conference) Google Scholar