K 3-22: a D-type symbiotic star
Romano L.M. Corradi, Corrado Giammanco
TL;DR
This paper confirms that K 3-22 is a D-type symbiotic star through optical spectroscopy, identifying characteristic high excitation nebular features and Raman-scattered O VI emission, distinguishing it from planetary nebulae.
Contribution
The study provides the first spectroscopic confirmation of K 3-22 as a D-type symbiotic star, clarifying its classification previously mistaken as a planetary nebula.
Findings
K 3-22 exhibits high excitation nebular spectrum.
Presence of Raman-scattered O VI emission confirms symbiotic nature.
Spectroscopy distinguishes it from planetary nebulae.
Abstract
A goal of the IPHAS survey is to determine the frequency and nature of emission-line sources in the Galactic plane. According to our selection criteria, K 3-22 is a candidate symbiotic star, but it was previously classified as a planetary nebula. To determine its nature, we acquired a low-resolution optical spectrum of K 3-22. Our analysis of our spectroscopy demonstrates that K 3-22 is indeed a D-type symbiotic star, because of its high excitation nebular spectrum and the simultaneous presence of Raman-scattered O VI emission at 6825 and 7082 angstrom, which is detected primarily in symbiotic stars.
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