# Stellar parameters and H α line profile variability of Be stars in the BeSOS survey

@article{Arcos2018StellarPA,
title={Stellar parameters and H $\alpha$ line profile variability of Be stars in the BeSOS survey},
author={C Arcos and Samer Kanaan and Joseph P'aez Ch'avez and Leonardo Vanzi and Ignacio J Araya and Michel Cur'e},
journal={Monthly Notices of the Royal Astronomical Society},
year={2018},
volume={474},
pages={5287-5299}
}
• C. Arcos, +3 authors M. Cur'e
• Published 23 November 2017
• Physics
• Monthly Notices of the Royal Astronomical Society
The Be phenomenon is present in about 20$\%$ of the B-type stars. Be stars show variability on a broad range of timescales, which in most cases is related to the presence of a circumstellar disk of variable size and structure. For this reason a time resolved survey is highly desirable in order to understand the mechanisms of disk formation which are still poorly understood. In addition, a complete observational sample would improve the statistical significance of the study of the stellar and…

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## References

SHOWING 1-10 OF 28 REFERENCES
First spectro-interferometric survey of Be stars I. Observations and constraints on the disk geometry and kinematics
Context. Classical Be stars are hot non-supergiant stars surrounded by a gaseous circumstellar disk that is responsible for the observed infrared-excess and emission lines. The phenomena involved in
Classical Be Stars
• Physics
• 2003
Recent results for classical Be stars are reviewed and links to general astrophysics are presented. Classical Be stars are B-type stars close to the main sequence that exhibit line emission over the
Kinematics and geometrical study of the Be stars 48 Persei and ψ Persei with the VEGA/CHARA interferometer
Context. Five different physical processes might be responsible for the formation of decretion disks around Be stars: fast rotation of the star, stellar pulsations, binarity, stellar winds, and
Cyclic variability of the circumstellar disk of the Be star $\zeta$ Tauri - II. Testing the 2D global disk oscillation model
Context. About 2/3 of the Be stars present the so-called V/R variations, a phenomenon characterized by the quasi-cyclic variation in the ratio between the violet and red emission peaks of the H i
Correlation and variability of the HeI 4471 and MgII 4481 absorption lines in Be stars: A possible diagnostic tool for nonradial pulsations
• Physics
• 1990
In a total of 181 photographic spectrograms, obtained at the Manuel Foster Observatory of the Catholic University in Santiago (Chile), the equivalent widths of the absorption lines HeI 4471 and MgII
Investigating the Circumstellar Disk of the Be Shell Star 48 Librae
A global disk oscillation implemented in the viscous decretion disk (VDD) model has been used to reproduce most of the observed properties of the well known Be star $\zeta$ Tau. 48 Librae shares
Evidence for Different Disk Mass Distributions Between Early and Late-Type Be Stars in the BeSOS Survey
• Physics
• 2017
The circumstellar disk density distributions for a sample of 63 Be southern stars from the BeSOS survey were found by modelling their H$\alpha$ emission line profiles. These disk densities were used
Model atmospheres for G, F, A, B, and O stars
A grid of LTE model atmospheres is presented for effective temperatures ranging from 5500 to 50,000 K, for gravities from the main sequence down to the radiation pressure limit, for abundances solar,
Effects of gravitational darkening on the determination of fundamental parameters in fast-rotating B-type stars
• Physics
• 2005
In this paper we develop a calculation code to account for the effects carried by fast rotation on the observed spectra of early-type stars. Stars are assumed to be in rigid rotation, and the grid of
The Be Star Spectra (BeSS) Database
• Physics
• 2011
Be stars vary on many timescales, from hours to decades. A long time base of observations to analyze certain phenomena in these stars is therefore necessary. Collecting all existing and future Be