LAMOST J202629.80+423652.0 is not a symbiotic star

Abstract

AMOST J202629.80+423652.0 has been recently classified as a new symbiotic star containing a long-period Mira, surrounded by dust (D-type) and displaying in the optical spectra high ionization emission lines, in-cluding the Raman-scattered OVI at 6825 A. We have observed LAMOST J202629.80+423652.0 photometrically in the BVRI bands and spectroscopi-cally over the 3500-8000 A range. We have found it to be a normal G8 IV sub-giant star, deprived of any emission line in its spectrum, and reddened by EB-V =0.35 mag. Combining our photometry with data from all-sky patrol surveys, we find LAMOST J202629.80+423652.0 to be non variable, so not pulsating as a Mira. We have compiled from existing sources its spectral en-ergy distribution, extending well into the mid-Infrared, and found it completely dominated by the G8 IV photospheric stellar emission, without any sign of cir-cumstellar dust. We therefore conclude that LAMOST J202629.80+423652.0 is not a symbiotic star, nor it is pulsating or been enshrouded in dust.