2001/10/15 by I. Neill Reid, I. N. Reid, K. L. Cruz +1 · 1 citation
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Atmospheric Ozone and Climate #Spectroscopy and Laser Applications #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/338083
accepted for the Astronomical Journal
arxiv created 2001/10/15 · openalex publication_date 2002/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
We present narrowband M photometry of nine low-mass dwarfs with spectral types ranging from M2.5 to L0.5. Combining the ( L '- M ') colors derived from our observations with data from the literature, we find colors consistent with a Rayleigh-Jeans flux distribution for spectral types earlier than M5, but enhanced F 3.8 / F 4.7 flux ratios (negative [ L '- M '] colors) at later spectral types. This probably reflects increased absorption at M ' due to the CO fundamental band. We compare our results against recent model predictions and briefly discuss the implications.