Four nearby L dwarfs

Details Four nearby L dwarfs Four nearby L dwarfs

1999-09-20

arxiv.org/abs/astro-ph/9909336v1

Astron.J.119:369-377,2000

Astronomy and Astrophysics

Astrophysics

to appear in AJ, January 2000; 27 pages, including 3 tables and 7 figures embedded in the text

Scientific paper

10.1086/301177

We present spectroscopic, photometric and astrometric observations of four bright L dwarfs identified in the course of the 2MASS near-infrared survey. Our spectroscopic data extend to wavelengths shortward of 5000\AA in the L0 dwarf 2MASSJ0746+2000 and the L4 dwarf 2MASSJ0036+1840, allowing the identification of absorption bands due to MgH and CaOH. The atomic resonance lines Ca I 4227\AA and Na I 5890/5896\AA are extremely strong, with the latter having an equivalent width of 240\AA in the L4 dwarf. By spectral type L5, the D lines extend over $\sim1000$\AA and absorb a substantial fraction of the flux emitted in the V band, with a corresponding effect on the (V-I) broadband colour. The KI resonance doublet at 7665/7699\AA increases in equivalent width from spectral type M3 to M7, but decreases in strength from M7 to L0 before broadening substantially at later types. These variations are likely driven by dust formation in these cool atmospheres.

Affiliated with

Also associated with

No associations

Rating

Four nearby L dwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Four nearby L dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four nearby L dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-429289