The candidate luminous blue variable G79.29+0.46: a comprehensive study of its ejecta through a multiwavelength analysis
Abstract
We present a multiwavelength analysis of the nebula around the candidate luminous blue variable G79.29+0.46. The study is based on our radio observations performed at the Expanded Very Large Array and at the Green Bank Telescope and on archival infrared data sets, including recent images obtained by the Herschel Space Observatory. We confirm that the radio central object is characterized by a stellar wind and we derive a current mass-loss rate of about 1.4 × 10^(−6 )M_⊙ yr^(−1). We find the presence of a dusty compact envelope close to the star, with a temperature between ∼40 and 1200 K. We estimate for the outer ejecta an ionized gas mass of 1.51 M_⊙ and a warm (60–85 K) dust mass of 0.02 M_⊙. Diagnostics of the far-infrared spectra indicate the presence of a photodissociation region around the ionized gas. Finally, we model the nebula with the photoionization code cloudy, using as input parameters those estimated from our analysis. We find for the central star a luminosity of 10^(5.4) L_⊙ and an effective temperature of 20.4 kK.
Additional Information
© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 February 10. Received 2014 February 7; in original form 2013 November 23. First published online: March 23, 2014. We thank the anonymous referee for useful comments that have helped to improve the manuscript. This paper is part of the PhD thesis of CA, who is very grateful to her tutors for supervising her PhD work. CA also thanks the Spitzer Science Center/Infrared Processing and Analysis Center staff at Caltech for the support provided during her visit to complete this project. She would especially like to thank Roberta Paladini for the invaluable suggestions received during her PhD programme. This work is based on observations performed at the National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Herschel is a European Space Agency (ESA) space observatory with science instruments provided by the European-led Principal Investigator consortia and with important participation from the National Aeronautics and Space Administration (NASA). This research has also made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. The ISO was an ESA project with instruments funded by ESA Member States (especially the PI countries, France, Germany, the Netherlands and the UK) andwith the participation of ISAS and NASA. Finally, this publication makes use of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the National Science Foundation.Attached Files
Published - MNRAS-2014-Agliozzo-1391-409.pdf
Submitted - 1402.2983v1.pdf
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Additional details
- Eprint ID
- 45991
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- CaltechAUTHORS:20140530-085503993
- NASA/JPL/Caltech
- ESA Member States
- NASA
- NSF
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2014-05-30Created from EPrint's datestamp field
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2021-11-10Created from EPrint's last_modified field