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An outer-disk SX Phe variable star in Rubin Data Preview 1
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An outer-disk SX Phe variable star in Rubin Data Preview 1
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Paper
An outer-disk SX Phe variable star in Rubin Data Preview 1
2025
Overview
We report the discovery of an SX Phoenicis-type pulsating variable star via 217 epochs of time-series photometry from the Vera C. Rubin Observatory's Data Preview 1. The star, designated LSST-DP1-O- 614435753623041404 (or LSST-C25_var1 for short), has mean magnitudes of \\(( g r) = (18.65, 18.63)\\), with pulsation amplitudes of (0.60, 0.38)~mag in these bands. Its period is 0.0767 days (1.841 hours), typical of SX Phe pulsators. We derive a distance to the star of 16.6 kpc based on an SX Phe period-luminosity relation. Its position \\(5\\) kpc from the Galactic plane, in the outer Milky Way disk at a Galactocentric distance of \\(22\\) kpc, and its proper motion suggest that LSST-C25_var1 is part of the Monoceros Ring structure. This star is presented as a small taste of the many thousands of variable stars expected in Rubin/LSST data.
Publisher
Cornell University Library, arXiv.org
Subject
