# There Are (super)Giants in the Sky: Searching for Misidentified Massive Stars in Algorithmically-Selected Quasar Catalogs

## TL;DR

This paper investigates misclassifications in large astronomical catalogs, revealing that some X-ray bright stars are incorrectly labeled as quasars, and highlights the importance of identifying such errors for accurate astronomical data.

## Contribution

The study uncovers instances of misidentified massive stars in quasar catalogs and develops methods to find and analyze these errors using multi-wavelength data.

## Key findings

- Identification of an X-ray bright quasar misclassified as a red supergiant
- Discovery of X-ray bright stars misidentified as quasars in SDSS catalog
- Demonstration of the need for careful classification to avoid catalog errors

## Abstract

Thanks to incredible advances in instrumentation, surveys like the Sloan Digital Sky Survey have been able to find and catalog billions of objects, ranging from local M dwarfs to distant quasars. Machine learning algorithms have greatly aided in the effort to classify these objects; however, there are regimes where these algorithms fail, where interesting oddities may be found. We present here an X-ray bright quasar misidentified as a red supergiant/X-ray binary, and a subsequent search of the SDSS quasar catalog for X-ray bright stars misidentified as quasars.