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A 20-year H2O maser monitoring program with the Medicina 32-m telescope

Published online by Cambridge University Press:  01 March 2007

J. Brand ,
M. Felli ,
R. Cesaroni ,
C. Codella ,
G. Comoretto ,
S. Di Franco ,
F. Massi ,
L. Moscadelli ,
R. Nesti  and
L. Olmi
...Show all authors
J. Brand
Affiliation:
INAF-Istituto di Radioastronomia, Bologna, Italy email: [email protected]
M. Felli
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
R. Cesaroni
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
C. Codella
Affiliation:
INAF-Istituto di Radioastronomia, Sez. di Firenze, Florence, Italy
G. Comoretto
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
S. Di Franco
Affiliation:
Dip. di Astronomia, Università degli Studi di Firenze, Florence, Italy
F. Massi
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
L. Moscadelli
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
R. Nesti
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
L. Olmi
Affiliation:
INAF-Istituto di Radioastronomia, Sez. di Firenze, Florence, Italy
F. Palagi
Affiliation:
INAF-Istituto di Radioastronomia, Sez. di Firenze, Florence, Italy
F. Palla
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
D. Panella
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
R. Valdettaro
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Florence, Italy
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Abstract

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The Arcetri/Bologna H2O maser group has been monitoring the 1.3-cm water maser emission from a sample of 43 star-forming regions (SFRs) and 22 late-type stars for about 20 years at a sampling rate of 4-5 observations each year, using the 32-m Medicina Radio Telescope (HPBW 1.′9 at 22 GHz). For the late-type stars we observe representative samples of OH/IR-stars, Mira's, semi-regular variables, and supergiants. The SFR-sample spans a large interval in FIR luminosity of the associated Young Stellar Object (YSO), from 20 L⊙ to 1.5 × 106 L⊙, and offers a unique data base for the study of the long-term (years) variability of the maser emission in regions of star formation.

This presentation concerns only the masers in SFRs. The information obtained from single-dish monitoring is complementary to what is extracted from higher-resolution (VLA and VLBI) observations, and can better explore the velocity domain and the long-term variability therein.

We characterize the variability of the sources in various ways and we study how it depends on the luminosity and other properties of the associated YSO and its environment.

Keywords

masersastronomical data bases: miscellaneous
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 223 - 227
Copyright
Copyright © International Astronomical Union 2008

References

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