Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey

Details Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey

2010-01-19

arxiv.org/abs/1001.3402v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

58 pages, 11 figures, 8 tables, accepted for publication in the Astronomical Journal

Scientific paper

We present a sample of 484 L dwarfs, 210 of which are newly discovered from the Sloan Digital Sky Survey (SDSS) Data Release 7 spectroscopic database. We combine this sample with known L dwarfs to investigate their $izJHK_S$ colors. Our spectroscopically selected sample has $\sim$0.1 magnitude bluer median $J-K_S$ colors at a given spectral type (for L0 to L4) than previously known L dwarfs, which reflects a bias towards redder L dwarfs in past selection criteria. We present photometric distance relations based on $i-z$ and $i-J$ colors and derive distances to our L dwarf sample. We combine the distances with SDSS/2MASS proper motions in order to examine the tangential velocities. For the majority of our spectroscopic sample, we measured radial velocities and present three dimensional kinematics. We also provide H$\alpha$ detections for the fraction of our sample with sufficient quality spectra. Comparison of the velocities of our L dwarf sample to a kinematic model shows evidence for both cold and hot dynamical populations, consistent with young and old disk components. The dispersions of these components are similar to those found for M dwarfs. We also show that $J-K_S$ color is correlated with velocity dispersion, confirming a relationship between $J-K_S$ color and age.

Affiliated with

Also associated with

No associations

Rating

Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey 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 Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-127837