Photocenter Shift Effect in Double Stars of Gaia DR2 Database

• Autorzy: López Oriona A. , Ling J. F. , Sánchez Sellero C.

Identyfikatory

DOI

10.32023/0001-5237/70.1.2

• Języki publikacji: EN

Abstrakty

EN

In order to check the performance of the Gaia satellite when detecting double stars, we attempted to discover a photocenter shift affecting Gaia's second data release (Gaia DR2). We analyzed data of bona-fide double stars from "Double and Multiple System Annex" catalog and matched them with the Gaia DR2 catalog. We tried to derive a relationship between measurements of visual magnitude and signs of binarity based on parallaxes and proper motions. A comprehensive study of parallaxes indicates the presence of the photocenter shift effect. Due to the proper motion two-dimensional nature, we conducted only a simply study which implies that a real photocenter shift may affect double stars appearing in the Gaia DR2 catalog as single sources.

Słowa kluczowe

EN

binaries visual; parallaxes; proper motions; astrometry

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2020
• Tom: Vol. 70, No. 1
• Strony: 19--32
• Opis fizyczny: Bibliogr. 17 poz., wykr.

Twórcy

autor

López Oriona A.

• University of Santiago de Compostela, Santiago de Compostella, Spain

autor

Ling J. F.

• University of Santiago de Compostela, Santiago de Compostella, Spain
• Ramon María Aller Observatory

autor

Sánchez Sellero C.

• University of Santiago de Compostela, Santiago de Compostella, Spain
• Department of Statistics, Mathematical Analysis and Optimization

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