Detection of radio emission from stars via proper-motion searches

IF 4.5 3区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Australia Pub Date : 2023-06-13 DOI:10.1017/pasa.2023.26

L. Driessen, G. Heald, S. Duchesne, T. Murphy, E. Lenc, J. Leung, V. Moss

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引用次数: 0

Abstract

Abstract We present a method for identifying radio stellar sources using their proper-motion. We demonstrate this method using the FIRST, VLASS, RACS-low and RACS-mid radio surveys, and astrometric information from Gaia Data Release 3. We find eight stellar radio sources using this method, two of which have not previously been identified in the literature as radio stars. We determine that this method probes distances of $\sim$ 90pc when we use FIRST and RACS-mid, and $\sim$ 250pc when we use FIRST and VLASS. We investigate the time baselines required by current and future radio sky surveys to detect the eight sources we found, with the SKA (6.7 GHz) requiring $<$ 3 yr between observations to find all eight sources. We also identify nine previously known and 43 candidate variable radio stellar sources that are detected in FIRST (1.4 GHz) but are not detected in RACS-mid (1.37 GHz). This shows that many stellar radio sources are variable, and that surveys with multiple epochs can detect a more complete sample of stellar radio sources.

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通过自运动搜索来探测来自恒星的无线电发射

摘要提出了一种利用射电恒星的自运动特性识别射电恒星源的方法。我们使用FIRST、VLASS、RACS-low和RACS-mid射电巡天以及来自Gaia Data Release 3的天体测量信息来验证该方法。我们用这种方法发现了八个恒星射电源，其中两个以前在文献中没有被确定为射电星。我们确定，当我们使用FIRST和rac -mid时，该方法探测$\sim$ 90pc的距离，当我们使用FIRST和VLASS时，该方法探测$\sim$ 250pc的距离。我们研究了当前和未来射电巡天所需的时间基线，以探测到我们发现的8个源，其中SKA (6.7 GHz)的观测间隔需要< 3年才能找到所有8个源。我们还确定了9个已知的和43个候选的可变射电恒星源，它们在FIRST (1.4 GHz)中被探测到，但在RACS-mid (1.37 GHz)中未被探测到。这表明许多恒星射电源是可变的，通过多个时代的调查可以探测到更完整的恒星射电源样本。

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

Publications of the Astronomical Society of Australia 地学天文-天文与天体物理

CiteScore

5.90

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： Publications of the Astronomical Society of Australia (PASA) publishes new and significant research in astronomy and astrophysics. PASA covers a wide range of topics within astronomy, including multi-wavelength observations, theoretical modelling, computational astronomy and visualisation. PASA also maintains its heritage of publishing results on southern hemisphere astronomy and on astronomy with Australian facilities. PASA publishes research papers, review papers and special series on topical issues, making use of expert international reviewers and an experienced Editorial Board. As an electronic-only journal, PASA publishes paper by paper, ensuring a rapid publication rate. There are no page charges. PASA''s Editorial Board approve a certain number of papers per year to be published Open Access without a publication fee.