A machine learning approach for identification and classification of symbiotic stars using 2MASS and WISE

Abstract

In this second paper in a series of papers based on the most-up-to-date catalogue of symbiotic stars (SySts), we present a new approach for identifying and distinguishing SySts from other Halpha emitters in photometric surveys using machine learning algorithms such as classification tree, linear discriminant analysis, and K-nearest neighbour. The motivation behind of this work is to seek for possible colour indices in the regime of near- and mid-infrared covered by the 2MASS and WISE surveys. A number of diagnostic colour-colour diagrams are generated for all the known Galactic SySts and several classes of stellar objects that mimic SySts such as planetary nebulae, post-AGB, Mira, single K and M giants, cataclysmic variables, Be, AeBe, YSO, weak and classical T Tauri stars, and Wolf-Rayet. The classification tree algorithm unveils that primarily J-H, W1-W4 and Ks-W3 and secondarily H-W2, W1-W2 and W3-W4 are ideal colour indices to identify SySts. Linear discriminant analysis method is also applied to determine the linear combination of 2MASS and AllWISE magnitudes that better distinguish SySts. The probability of a source being a SySt is determined using the K-nearest neighbour method on the LDA components. By applying our classification tree model to the list of candidate SySts (Paper I), the IPHAS list of candidate SySts, and the DR2 VPHAS+ catalogue, we find 125 (72 new candidates) sources that pass our criteria while we also recover 90 per cent of the known Galactic SySts.

33 pages,22 figures,Accepted for publication in MNRAS

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• ODUSSEAS: Upgraded version with new reference scale and parameter determinations for 82 planet-host M dwarf stars in SWEET-Cat
• Spectroscopic and photometric analysis of symbiotic candidates -- I. Ten candidates on classical symbiotic stars
• Discovery of five new Galactic symbiotic stars in the VPHAS+ survey
• Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues
• SU Lyn -- a transient symbiotic star
• RAMSES II - RAMan Search for Extragalactic Symbiotic Stars. Project concept, commissioning, and early results from the science verification phase
• DeGaPe 35: Amateur discovery of a new southern symbiotic star
• THA 15-31: Discovery with VLT/X-Shooter and Swift/UVOT of a new symbiotic star of the accreting-only variety
• V618 Sgr: Galactic eclipsing symbiotic nova detected in repeated outbursts
• Classification of low-luminosity stellar X-ray sources in the field of the Draco dwarf spheroidal galaxy
• A massive AGB donor in Scutum X-1: Identification of the first Mira variable in an X-ray binary
• A Classifier to Detect Elusive Astronomical Objects through Photometry
• XMM-Newton study of the Sculptor dwarf spheroidal galaxy
• Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
• Planetary Nebulae and How to Find Them: Color Identification in Big Broadband Surveys
• eROSITA (eRASS1) study of the Canis Major overdensity: Developing a multi-wavelength algorithm for classifying faint X-ray sources