UV spectroscopy confirms SU Lyn to be a symbiotic star

Abstract

SU Lyn, a star that ostensibly appears to be an unremarkable late M type giant, has recently been proposed to be a symbiotic star largely based on its hard X-ray properties. The star does not display, in low-resolution optical spectra, the high excitation lines typically seen in the spectra of symbiotic stars. In the present work, UV, optical, and near-infrared observations are presented, aimed at exploring and strengthening the proposed symbiotic classification for this star. Our Far-UV 1300-1800$\mathring{A}$ spectrum of SU Lyn, obtained with the ASTROSAT mission's UVIT payload, shows emission lines of Si IV, C IV, OIII and N III in a spectrum typical of symbiotic stars. The UV spectrum robustly confirms SU Lyn's symbiotic nature. The detection of high excitation lines in a high-resolution optical spectrum further consolidates its symbiotic nature. As is being recognized, the potential existence of other similar symbiotic systems could significantly impact the census of symbiotic stars in the galaxy.

arXiv commentAccepted for publication in MNRAS-Letters

References in corpus (14)

• In-orbit Calibrations of the Ultra-Violet Imaging Telescope
• Additional Calibration of the Ultra-Violet Imaging Telescope on board AstroSat
• Symbiotic stars in X-rays
• A multi-epoch spectrophotometric atlas of symbiotic stars
• A census of symbiotic stars in the 2MASS, WISE and Gaia surveys
• In-orbit Performance of UVIT and First Results
• SU Lyncis, a hard X-ray bright M giant: Clues point to a large hidden population of symbiotic stars
• In-orbit Performance of UVIT on ASTROSAT
• The Symbiotic Stars
• Early formation of carbon monoxide in the Centaurus A supernova SN 2016adj
• SU Lyn: diagnosing the boundary layer with UV and hard X-ray data
• Studying the Imaging Characteristics of Ultra Violet Imaging Telescope (UVIT) through Numerical Simulations
• Line formation regions of the UV spectrum of CI Cygni
• First Results from MFOSC-P : Low Resolution Optical Spectroscopy of a Sample of M dwarfs within 100 parsecs

Cited by in corpus (5)

• The GALAH Survey and Symbiotic Stars. I. Discovery and follow-up of 33 candidate accreting-only systems
• Symbiotic stars in the era of modern ground- and space-based surveys
• SU Lyn -- a transient symbiotic star
• Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues
• Comprehensive analysis of a symbiotic candidate V503 Her