An X-Shooter view of the symbiotic star [JD2002] 11

TL;DR

This study confirms [JD2002] 11 as a dusty symbiotic star in the Small Magellanic Cloud, using spectral analysis and photometry to determine its properties and classify its nebula and dust characteristics.

Contribution

First detailed spectral and photometric analysis of [JD2002] 11, establishing it as the second dusty symbiotic star in the Small Magellanic Cloud.

Findings

Identified two-component nebula with different densities.

Fitted spectral energy distribution with two blackbody components.

Estimated luminosity consistent with a Mira star in dust shell.

Abstract

We aimed to verify the nature and derive the basic parameters of the symbiotic star candidate [JD2002] 11. For this purpose, we obtained and analysed an X-Shooter spectrum of [JD2002] 11. We also used optical and infrared photometry available for the object. Emission-line diagnostic ratios are characteristic of a dusty type symbiotic star and reveal a two-component nebula (low- and high-density). The spectral energy distribution is well fitted with a two-component blackbody spectrum with the respective temperatures of 1150 K and 600 K. The total luminosity of $\rm 3000\,L_{\odot}$ is consistent with the expected luminosity of a typical Mira star, embedded in an optically thick dust shell. We conclude that [JD2002] 11 is the ninth symbiotic star in total and only the second dusty type symbiotic star discovered in the Small Magellanic Cloud.