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A survey for variable young stars with small telescopes: VI — Analysis of the outbursting Be stars NSW284, Gaia19eyy, and VES263

Froebrich, Dirk, Hillenbrand, Lynne A., Herbert, Carys, De, Kishalay, Eislöffel, Jochen, Campbell-White, Justyn, Kahar, Ruhee, Hambsch, Franz-Josef, Urtly, Thomas, Popowicz, Adam, and others. (2023) A survey for variable young stars with small telescopes: VI — Analysis of the outbursting Be stars NSW284, Gaia19eyy, and VES263. Monthly Notices of the Royal Astronomical Society, 520 (4). pp. 5413-5432. ISSN 0035-8711. (doi:10.1093/mnras/stad407) (KAR id:99933)

Abstract

This paper is one in a series reporting results from small telescope observations of variable young stars. Here, we study the repeating outbursts of three likely Be stars based on long-term optical, near-infrared, and mid-infrared photometry for all three objects, along with follow-up spectra for two of the three. The sources are characterised as rare, truly regularly outbursting Be stars. We interpret the photometric data within a framework for modelling light curve morphology, and find that the models correctly predict the burst shapes, including their larger amplitudes and later peaks towards longer wavelengths. We are thus able to infer the start and end times of mass loading into the circumstellar disks of these stars. The disk sizes are typically 3 – 6 times the areas of the central star. The disk temperatures are ∼ 40 %, and the disk luminosities are ∼ 10 % of those of the central Be star, respectively. The available spectroscopy is consistent with inside-out evolution of the disk. Higher excitation lines have larger velocity widths in their double-horned shaped emission profiles. Our observations and analysis support the decretion disk model for outbursting Be stars.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stad407
Uncontrolled keywords: techniques: photometric, stars: early-type, stars: emission-line, Be, stars: mass-loss
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Funders: Science and Technology Facilities Council (https://ror.org/057g20z61)
Depositing User: Dirk Froebrich
Date Deposited: 07 Feb 2023 14:50 UTC
Last Modified: 08 Feb 2024 09:22 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/99933 (The current URI for this page, for reference purposes)
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