# Reclassifying symbiotic stars with 2MASS and WISE: An atlas of spectral energy distribution

## TL;DR

This paper updates the catalog of symbiotic stars, constructs their spectral energy distributions using 2MASS and WISE data, and reclassifies them into types based on their SED profiles, revealing new insights into their properties.

## Contribution

It provides an expanded catalog of symbiotic stars, constructs their SEDs with infrared data, and offers a new classification scheme based on spectral energy distribution profiles.

## Key findings

- Increased known symbiotic stars by ~50% in our Galaxy and ~400% extragalactically.
- Reclassification of symbiotic stars into S-, D-, and D'-types based on SED profiles.
- First compilation of symbiotic stars exhibiting the OVI Raman-scattered line at 6830Å.

## Abstract

We present a new updated catalogue of Galactic and extragalactic symbiotic stars (SySts). Since the last catalogue of SySts (Belczynski et al. 2000), the number of known SySts has significantly increased. Our new catalogue contains 316 known and 82 candidates SySts. Of the confirmed Systs 252 are located in our Galaxy and 64 in nearby galaxies. This reflects an increase of $\sim$50% in the population of Galactic SySts and $\sim$400% in the population of extragalactic SySts. The spectral energy distribution (SED) of 334 (known and candidates) SySts have been constructed using the 2MASS and WISE data. These SEDs are used to provide a robust reclassification in scheme of S- (74%), D- (15%) and D'-types (2.5%). The SEDs of S- and D-type peak between 0.8 and 1.6$\mu$m and between 1.6 and 4$\mu$m, respectively, whereas those of D'-type exhibit a plateau profile. Moreover, we provide the first compilation of SySts that exhibit the OVI Raman-scattered line at 6830\AA. Our analysis shows that 55% of the Galactic SySts exhibit that line in their spectrum, whereas this percentage is different from galaxy to galaxy.