Modeling of the optical spectra of late M-dwarfs

Details Modeling of the optical spectra of late M-dwarfs Modeling of the optical spectra of late M-dwarfs

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnt...16..324l&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 16, no. 4, p. 324-335

Physics

Scientific paper

We discuss the results of modeling of the optical spectra (λλ 600-900 nm) of two late M dwarfs, GJ51 (V M5) and GJ1111 (V M6.5), and the young brown dwarf Teide1 (V M8). The dependence of the spectra on effective temperature and gravity is studied. From the fit of the calculated spectra to the observed ones we determined the effective temperatures Tef = 3100 K and 2900 K for GJ51 and GJ1111, respectively, and Tef =2700 K for Teide1. The synthetical spectra at λλ 810.6-814.6 nm, 668.8-672.8 nm, and 608.3-612.3 nm were simulated using both the just-overlapping (JOLA) and the line-by-line (LBL) approximations for Plez's (1998) TiO line list. We show that these aproximations give similar results for the saturated molecular bands which govern the optical spectra of late M-dwarfs. The impact of chromospheric-like structures on the molecular spectra of M-dwarfs was also considered.

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