SIMBAD references

2018ApJ...857...30M - Astrophys. J., 857, 30-30 (2018/April-2)

Excitation mechanism of O I lines in Herbig Ae/Be stars.

MATHEW B., MANOJ P., NARANG M., BANERJEE D.P.K., NAYAK P., MUNEER S., VIG S., PRAMOD KUMAR S., PAUL K.T. and MAHESWAR G.

Abstract (from CDS):

We have investigated the role of a few prominent excitation mechanisms viz. collisional excitation, recombination, continuum fluorescence, and Lyman beta fluorescence on the O I line spectra in Herbig Ae/Be stars. The aim is to understand which of them is the central mechanism that explains the observed O I line strengths. The study is based on an analysis of the observed optical spectra of 62 Herbig Ae/Be stars and near-infrared spectra of 17 Herbig Ae/Be stars. The strong correlation observed between the line fluxes of O I λ8446 and O I λ11287, as well as a high positive correlation between the line strengths of O I λ8446 and Hα suggest that Lyman beta fluorescence is the dominant excitation mechanism for the formation of O I emission lines in Herbig Ae/Be stars. Furthermore, from an analysis of the emission line fluxes of O I λλ7774, 8446, and comparing the line ratios with those predicted by theoretical models, we assessed the contribution of collisional excitation in the formation of O I emission lines.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): circumstellar matter - infrared: stars - stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - techniques: spectroscopic

Simbad objects: 64

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2020.10.28-22:03:52

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