What the study found
The study found that the Stellar LAbel Machine (SLAM), a data-driven model using support vector regression, can estimate metallicity ([Fe/H]), effective temperature (T eff), and surface gravity (log g) for Sloan Digital Sky Survey V M dwarfs from low-resolution BOSS spectra. Its metallicity estimates showed no bias in M+M dwarf wide binaries, and its temperature and gravity estimates generally agreed with several external reference methods.
Why the authors say this matters
The authors suggest this work matters because it provides calibrated stellar parameters for M dwarfs, a type of cool dwarf star, using BOSS optical spectra. They also conclude that the study can be used to correct a bias in APOGEE ASPCAP metallicities through an equation they provide.
What the researchers tested
The researchers applied SLAM to low-resolution optical spectra from the BOSS spectrographs in SDSS-V DR19. They calibrated [Fe/H] using LAMOST F, G, or K dwarf companions, and calibrated T eff and log g using APOGEE Net.
What worked and what didn't
For [Fe/H], comparisons between the two stars in M+M dwarf wide binaries showed no bias and a scatter of 0.11 dex. Other comparisons gave biases of −0.06 ± 0.16 dex and 0.02 ± 0.14 dex, while T eff agreed well with interferometric angular-diameter calibrations (−27 ± 92 K) and LAMOST (−34 ± 65 K) but was lower than one color-based relation by 146 ± 45 K. The log g values aligned well with LAMOST (−0.01 ± 0.07 dex) and with values derived from stellar mass and radius (−0.04 ± 0.09 dex), and the bias versus APOGEE ASPCAP depended on ASPCAP [Fe/H] and T eff.
What to keep in mind
The abstract does not describe major limitations beyond the fact that the calibrations and comparisons are tied to the specific datasets and reference methods used here. The summary also notes that the ASPCAP metallicity correction depends on ASPCAP [Fe/H] and T eff, but it does not provide broader validation details in the abstract.
Key points
- SLAM was used to estimate [Fe/H], T eff, and log g for SDSS-V M dwarfs from BOSS spectra.
- M+M dwarf wide-binary comparisons showed no [Fe/H] bias and 0.11 dex scatter.
- T eff matched interferometric and LAMOST-based values but was lower than one color-based estimate by 146 ± 45 K.
- log g agreed well with both LAMOST and values derived from stellar mass and radius.
- The authors provide an equation to correct a bias in APOGEE ASPCAP metallicities.
Disclosure
- Research title:
- SLAM estimates M-dwarf stellar parameters from BOSS spectra
- Authors:
- Dan 丹 Qiu 邱, Jennifer A. Johnson, Chao 超 Liu 刘, Diogo Martins Souto, Ilija Medan, Guy S. Stringfellow, Zachary Way, Yuan-sen Ting, A. R. Casey, Bárbara Rojas-Ayala, Ricardo López-Valdivia, Ying-Yi 盈亿 Song 宋, Bo 博 Zhang 章, Jiadong 佳东 Li 李, Aida Behmard, Szabolcs Mészáros, Keivan G. Stassun, José G. Fernández-Trincado
- Institutions:
- Eötvös Loránd University, Flatiron Health (United States), Flatiron Health (United States), Flatiron Institute, Flatiron Institute, Georgia State University, Konkoly Observatory, Laboratory for Atmospheric and Space Physics, Max Planck Institute for Astronomy, Monash University, MTA-SZTE Research Group on Artificial Intelligence, The Ohio State University, The Ohio State University, Universidad Católica del Norte, Universidad Nacional Autónoma de México, Universidade Federal de Sergipe, University of Tarapacá, Vanderbilt University, Vanderbilt University
- Publication date:
- 2026-03-09
- OpenAlex record:
- View
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