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Long-term variability of H2O masers in YSOs

Published online by Cambridge University Press:  03 August 2017

Riccardo Valdettaro ,
Francesco Palla ,
Jan Brand ,
Riccardo Cesaroni ,
Giovanni Comoretto ,
Marcello Felli  and
Francesco Palagi
Riccardo Valdettaro
Affiliation:
Osservatorio Astrofisico di Arcetri, L.go E. Fermi, 5, I-50125 Firenze, Italy
Francesco Palla
Affiliation:
Osservatorio Astrofisico di Arcetri, L.go 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, L.go E. Fermi, 5, I-50125 Firenze, Italy
Giovanni Comoretto
Affiliation:
Osservatorio Astrofisico di Arcetri, L.go E. Fermi, 5, I-50125 Firenze, Italy
Marcello Felli
Affiliation:
Osservatorio Astrofisico di Arcetri, L.go E. Fermi, 5, I-50125 Firenze, Italy
Francesco Palagi
Affiliation:
C.A.I.S.M.I.-CNR, L.go E. Fermi, 5, I-50125 Firenze, Italy

Abstract

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A sample of 14 water maser sources associated with young stellar objects (YSOs) has been monitored over 13 years with the Medicina 32-m antenna. The YSOs have been selected with bolometric luminosities from 20 L⊙ to 2 × 106 L⊙ with the aim of investigating the relationship between H2O maser variability and stellar mass. The results are presented in various graphical forms which allow to follow the variation of the different spectral components. In particular, four quantities have been considered in our analysis: the intensity of the maser lines as a function of time and velocity; the flux integrated over the observed velocity range as a function of time; the maximum flux ever observed at each velocity; and the frequency of occurrence of the maser emission at any given velocity.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 51 - 54
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Brand, J., Cesaroni, R., Caselli, P. et al. 1994, A&AS, 103, 541 Google Scholar
Comoretto, G., Palagi, F., Cesaroni, R. et al. 1990, A&AS, 84, 179 Google Scholar
Valdettaro, R., Palla, F., Brand, J. et al. 2001, A&A, 368, 845 Google Scholar