An outer-disk SX Phe variable star in Rubin Data Preview 1
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911063068377088 |
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| author | Carlin, Jeffrey L. Ferguson, Peter S. Vivas, A. Katherina Caplar, Neven Malanchev, Konstantin |
| author_facet | Carlin, Jeffrey L. Ferguson, Peter S. Vivas, A. Katherina Caplar, Neven Malanchev, Konstantin |
| contents | 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 $(\langle g\rangle, \langle r\rangle) = (18.65, 18.63)$, 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 $\sim5$ kpc from the Galactic plane, in the outer Milky Way disk at a Galactocentric distance of $\sim22$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_00192 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An outer-disk SX Phe variable star in Rubin Data Preview 1 Carlin, Jeffrey L. Ferguson, Peter S. Vivas, A. Katherina Caplar, Neven Malanchev, Konstantin Astrophysics of Galaxies Solar and Stellar Astrophysics 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 $(\langle g\rangle, \langle r\rangle) = (18.65, 18.63)$, 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 $\sim5$ kpc from the Galactic plane, in the outer Milky Way disk at a Galactocentric distance of $\sim22$ 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. |
| title | An outer-disk SX Phe variable star in Rubin Data Preview 1 |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2507.00192 |