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WB89 520: A Small Isolated High Mass Star Forming Region Associated with an Extremely Metal-poor Nebula

Published online by Cambridge University Press:  13 May 2016

Jun-Jie Wang ,
Jing-Yao Hu ,
Jian-Yan Wei  and
Leonardo Testi
Jun-Jie Wang
Affiliation:
National Astronomical Observatory, Beijing, 100012, P.R. China
Jing-Yao Hu
Affiliation:
National Astronomical Observatory, Beijing, 100012, P.R. China
Jian-Yan Wei
Affiliation:
National Astronomical Observatory, Beijing, 100012, P.R. China
Leonardo Testi
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy

Abstract

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In this paper, by discussing and analyzing the observational results of near infrared imaging, optical spectroscopy and 12CO molecular line, together with IRAS and NVSS data, we conclude that WB89 520 is an UC HII region with a very young compact stellar cluster. The spectrum of the UC HII region shows that it is an extremely metal-poor nebula, which has the lowest line ratio of [NII]/Hα (∼ 1/56) discovered in the nebulae of our Galaxy until now. We give two possible explanations for the low metallicity.

Type
Star Formation Regions and Outflow Processes in our Galaxy
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 284 - 285
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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