Doppler Tomography of the Circumstellar Disk of the Be Star κ Draconis

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS

Galaxies Pub Date : 2024-05-07 DOI:10.3390/galaxies12030023

I. A. Gabitova, A. Miroshnichenko, S. Zharikov, A. Amantayeva, S. Khokhlov

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Abstract

κ Draconis is a binary system with a classical Be star as the primary component. Its emission-line spectrum consists of hydrogen lines, notably the Hα line with peak intensity ratio (V/R) variations phase-locked with the orbital period P = 61.55 days. Among binaries demonstrating the Be phenomenon, κ Dra stands out as one of a few systems with a discernible mass of its secondary component. Based on more than 200 spectra obtained in 2014–2023, we verified the physical parameters and constructed the mass function. We used part of these data obtained in 2014–2021 to investigate regions in the circumstellar disk of the primary component that emit the Hα line using the Doppler tomography method. The results show that the disk has a non-uniform density distribution with a prominent enhancement at Vy ≈ 99 km s−1 and Vx≈−6 km s−1 that corresponds to a cloud-like source of the double-peaked Hα line profile. We argue that this enhancement’s motion is responsible for the periodic variations in the Hα V/R ratio, which is synchronised in orbital phase with the radial velocity (RV) of absorption lines from the atmosphere of the primary component.

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Be 星 κ Draconis 的环状星盘多普勒断层扫描图

κ Draconis 是一个双星系统，主成分是一颗经典的 Be 星。它的发射线光谱由氢线组成，特别是峰值强度比（V/R）变化与轨道周期 P = 61.55 天相位锁定的 Hα 线。在表现出 Be 现象的双星中，κ Dra 是少数几个次级成分质量可辨的系统之一。基于 2014-2023 年获得的 200 多条光谱，我们验证了物理参数并构建了质量函数。我们利用 2014-2021 年获得的部分数据，采用多普勒层析成像法研究了主成分周星盘中发射 Hα 线的区域。结果显示，星盘的密度分布并不均匀，在 Vy ≈ 99 km s-1 和 Vx≈-6 km s-1 处有明显的增强，对应于双峰 Hα 线剖面的云状源。我们认为，这种增强运动是造成 Hα V/R 比值周期性变化的原因，它在轨道相位上与来自主成分大气层的吸收线的径向速度（RV）同步。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Galaxies Physics and Astronomy-Astronomy and Astrophysics

CiteScore

4.90

自引率

12.00%

发文量

100

审稿时长

11 weeks

期刊介绍： Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.