STRONG BALMER EMISSION LINES IN YOUNG BROWN DWARFS
Main Article Content
Abstract
The presence of Balmer emission lines is an indicator of magnetic activity in stars. This paper presents the spectroscopic observations at blue wavelengths of nearby young brown dwarfs with previously detected lithium. All targets show strong Balmer emission lines, indicating that these brown dwarfs are magnetically active. A forbidden emission line is marginally detected in DENIS2022-5645, implying that this young brown dwarf is still an accreting material.
Keywords
brown dwarfs, magnetic fields, spectroscopy
Article Details
References
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Hawley, S. L., Gizis, J. E., & Reid, I. N. (1996). The Palomar/MSU Nearby Star Spectroscopic Survey. II. The Southern M Dwarfs and Investigation of Magnetic Activity. The Astronomical Journal, 112 (6), 2799-2827.
Herczeg, G. J., & Hillenbrand, L. A. (2008). UV excess measures of accretion onto young very low mass stars and brown dwarfs. The Astrophysical Journal, 681, 594-625.
Nguyen-Thanh, D., Phan-Bao, N., Murphy, S. J., & Bessell, M. S. (2020), Sporadic and intense accretion in a 1 Myr-old brown dwarf candidate. Astronomy and Astrophysics, 634, A128-A142.
Phan-Bao, N., Bessell, M. S., Nguyen-Thanh, D., Martín, E. L., Ho, P. T. P, Lee, C. F., & Parsons, H. (2017). Detection of lithium in nearby young late-M dwarfs. Astronomy and Astrophysics, 600, A19-A27.
Phan-Bao, N., & Bessell, M. S. (2022). Confirmed detection of lithium in nearby young late-M dwarfs. Communications in Physics, 32(2), 133-140.
Reiners, A., Seifahrt, A., & Dreizler, S. (2010). Discovery of a nearby young brown dwarf binary candidate. Astronomy and Astrophysics, 513, L9-L12.