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Infrared Spectroscopy of Be Stars: Influence of the Envelope Parameters on Brackett-Series Behaviour

Authors :
Yanina Roxana Cochetti
Anahi Granada
María Laura Arias
Andrea Fabiana Torres
Catalina Arcos
Source :
Galaxies, Vol 11, Iss 4, p 90 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The IR spectra of Be stars display numerous hydrogen recombination lines, constituting a great resource for obtaining information on the physical and dynamic structures of different regions within the circumstellar envelope. Nevertheless, this spectral region has not been analysed in depth, and there is a lack of synthetic spectra with which to compare observations. Therefore, we computed synthetic spectra with the HDUST code for different disc parameters. Here, we present our results on the spectral region that includes lines of the Brackett series. We discuss the dependence of the line series strengths on several parameters that describe the structure of the disc. We also compared model line profiles, fluxes, and EWs with observational data for two Be stars (MX Pup and π Aqr). Even though the synthetic spectra adequately fit our observations of both stars and allow us to constrain the parameters of the disc, there is a discrepancy with the observed data in the EW and flux measurements, especially in the case of MX Pup. It is possible that by including Brackett lines of higher terms or adding the analysis of other series, we may be able to better constrain the parameters of the observed disc.

Details

Language :
English
ISSN :
20754434
Volume :
11
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Galaxies
Publication Type :
Academic Journal
Accession number :
edsdoj.030e4a8c589c418bb1174e582597a4e3
Document Type :
article
Full Text :
https://doi.org/10.3390/galaxies11040090