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New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs

  • Authors: Adam J. Burgasser, Adam C. Schneider, Aaron M. Meisner, Dan Caselden, Chih-Chun Hsu, Roman Gerasimov, Christian Aganze, Emma Softich, Preethi Karpoor, Christopher A. Theissen, Hunter Brooks, Thomas P. Bickle, Jonathan Gagné, Ètienne Artigau, Michaël Marsset, Austin Rothermich, Jacqueline K. Faherty, J. Davy Kirkpatrick, Marc J. Kuchner, Nikolaj Stevnbak Andersen, Paul Beaulieu, Guillaume Colin, Jean Marc Gantier, Leopold Gramaize, Les Hamlet, Ken Hinckley, Martin Kabatnik, Frank Kiwy, David W. Martin, Diego H. Massat, William Pendrill, Arttu Sainio, Jörg Schümann, Melina Thévenot, Jim Walla, Zbigniew Wędracki

Adam J. Burgasser et al 2025 The Astrophysical Journal 982 .

  • Provider: AAS Journals

Caption: Figure 14.

Metallicity sequences of spectral type standards for the T0 (left), T3 (middle), and T6 (right) subclasses, showing from top to bottom dwarf, mild subdwarf (d/sd), subdwarf (sd), and extreme subdwarf (esd) standards. All data are smoothed to an equivalent resolution of λ/Δλ = 300, normalized at the 1.25 μm peak and offset by constants (dashed lines). The dwarf standard is repeated in magenta to compare to the d/sd, sd, and esd standards.

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