Spectrophotometry of VB10 and the optical spectral classification of low-luminosity M dwarfs

Astronomy and Astrophysics – Astronomy

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Dwarf Stars, M Stars, Near Infrared Radiation, Spectral Bands, Stellar Spectrophotometry, Titanium Oxides, Infrared Spectroscopy, Light Emission, Optical Emission Spectroscopy, Stellar Luminosity

Scientific paper

Optical and near-infrared spectrophotometry is presented for VB10 (BD +4 deg 4048B), the lowest-luminosity M dwarf known. The strongest TiO bands and the 5530-A probable CaOH feature are somewhat blended and do not appear significantly stronger than in the earlier M dwarfs G51-15 and W359. Less saturated TiO bands retain temperature sensitivity. Compared with the energy distribution in the infrared, the optical flux distribution of VB10 is remarkably flat due to the blending of the strong absorption bands.

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