Abstract
We present high-resolution spectra analysis of the three late-M dwarfs LP944-20, SIPS J2045-6332 and DENIS-P J0021.0-4244. The stellar spectra were observed with Very Large Telescope/Ultraviolet–Visual Echelle Spectrograph (VLT/UVES) in optical and near-infrared regions. The effective temperatures T eff and log g was defined by comparing observed and theoretical energy distributions for the investigated objects. Synthetic spectra were calculated for PHOENIX atmosphere models – COND and DUSTY, as well as for Semi-empirical atmosphere model. We discuss the influence of the effects associated with dust in stellar atmosphere on the energy distribution in the stellar spectra.
Highlights
Brown dwarfs are objects occupying an intermediate position between stars and giant planets
We present high-resolution spectra analysis of the three late-M dwarfs LP944-20, SIPS J2045-6332 and DENIS-P J0021.0-4244
The stellar spectra were observed with Very Large Telescope/Ultraviolet–Visual Echelle Spectrograph (VLT/UVES) in optical and near-infrared regions
Summary
Brown dwarfs are objects occupying an intermediate position between stars and giant planets. Investigation of brown dwarfs is important for understanding the evolution and structure of stars and planets. We present a study of 3 late-M dwarfs LP944-20, SIPS J2045-6332 and DENIS-P J0021.04244, that could be young brown dwarfs. The spectral type of LP 944-20 is estimated as M9.0 [3]. The spectral type of SIPS J2045-6332 range M8.5-M9.0 [15]. DENIS-P J0021.0-4244 is a member of wide ultracool binary with the spectral type M9.5 [6]. The spectra were obtaned with resolution R = 38000 in the spectral regions 5700–7530 Å and 7650–9470 Å. This work is part of an effort to characterize a sample of nearby M-dwarfs, from a program of Moving Groups research.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call