Excitation Mechanism of Oi Lines in Herbig Ae/Be Stars
- Title
- Excitation Mechanism of Oi Lines in Herbig Ae/Be Stars
- Creator
- Mathew B.; Manoj P.; Narang M.; Banerjee D.P.K.; Nayak P.; Muneer S.; Vig S.; Pramod Kumar S.; Paul K.T.; Maheswar G.
- Description
- 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 ?8446 and O i ?11287, as well as a high positive correlation between the line strengths of O i ?8446 and H? 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 ??7774, 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. 2018 The American Astronomical Society. All rights reserved..
- Source
- Astrophysical Journal, Vol-857, No. 1
- Date
- 2018-01-01
- Publisher
- Institute of Physics Publishing
- Subject
- circumstellar matter; infrared: stars; stars: pre-main sequence; stars: variables: T Tauri, Herbig Ae/Be; techniques: spectroscopic
- Coverage
- Mathew B., Department of Physics, Christ University, Hosur Road, Bangalore, 560029, India, Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India; Manoj P., Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India; Narang M., Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400005, India; Banerjee D.P.K., Astronomy and Astrophysics Division, Physical Research Laboratory, Navrangapura, Ahmedabad, 380 009, India; Nayak P., Indian Institute of Space Science and Technology (IIST), Trivandrum, India; Muneer S., Indian Institute of Astrophysics, Koramangala, Bangalore, 560034, India; Vig S., Indian Institute of Space Science and Technology (IIST), Trivandrum, India; Pramod Kumar S., Indian Institute of Astrophysics, Koramangala, Bangalore, 560034, India; Paul K.T., Department of Physics, Christ University, Hosur Road, Bangalore, 560029, India; Maheswar G., Indian Institute of Astrophysics, Koramangala, Bangalore, 560034, India
- Rights
- All Open Access; Bronze Open Access; Green Open Access
- Relation
- ISSN: 0004637X
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Mathew B.; Manoj P.; Narang M.; Banerjee D.P.K.; Nayak P.; Muneer S.; Vig S.; Pramod Kumar S.; Paul K.T.; Maheswar G., “Excitation Mechanism of Oi Lines in Herbig Ae/Be Stars,” CHRIST (Deemed To Be University) Institutional Repository, accessed November 4, 2025, https://archives.christuniversity.in/items/show/16945.