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Title: Excitation Mechanism of O i Lines in Herbig Ae/Be Stars
Authors: Mathew, B
Manoj, P
Narang, Mayank
Banerjee, D. P. K
Pratheeksha Nayak
Muneer, S
Vig, S
Kumar, S. P
Paul, K. T
Maheswar, G
Keywords: Circumstellar matter;Infrared: stars;Stars: pre-main sequence;Stars: variables: T Tauri, Herbig Ae/Be;Techniques: spectroscopic
Issue Date: 10-Apr-2018
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 857, No. 1, 30
Abstract: 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.
Description: Restricted Access
ISSN: 0004-637X
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Appears in Collections:IIAP Publications

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