DeGaPe 35: Amateur discovery of a new southern symbiotic star

TL;DR

This paper reports the discovery and detailed characterization of a new southern symbiotic star, DeGaPe 35, including spectroscopic and photometric analysis revealing its binary components and variability.

Contribution

It is the first detailed study of DeGaPe 35, identifying it as a new symbiotic star with specific stellar components and variability, expanding the catalog of known symbiotic systems.

Findings

Discovered a new S-type symbiotic star in the southern hemisphere.

Spectroscopic analysis revealed emission lines and stellar components.

Photometric variability suggests orbital motion with a period of 700-800 days.

Abstract

In this work, we present the discovery and characterization of a new southern S-type symbiotic star, DeGaPe 35. We have obtained the low-resolution spectroscopic observations and supplemented them with photometry from Gaia DR3 and other surveys. The optical spectra of this target show prominent emission lines, including highly ionized [Fe VII] and O VI lines. The cool component of this symbiotic binary is an M4-5 giant with effective temperature ~ 3 380 - 3 470 K and luminosity ~ 3 000 L$_\odot$ (for the adopted distance of 3 kpc). The hot component is a shell-burning white dwarf. The photometric observations of the Gaia satellite, published recently in the Gaia DR3 suggested the variability with the period of about 700 - 800 days that we tentatively attributed to the orbital motion of the binary.