Issue |
A&A
Volume 429, Number 2, January II 2005
|
|
---|---|---|
Page(s) | 525 - 530 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20041265 | |
Published online | 17 December 2004 |
Kinematics of Vega-like stars: Lifetimes and temporal evolution of circumstellar dust disks
Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560034, India e-mail: manoj@iiap.res.in
Received:
10
May
2004
Accepted:
13
August
2004
We have used the velocity dispersion as an age indicator to
constrain the ages of a large sample of main sequence Vega-like stars
in order to study the lifetimes and temporal evolution of the dust
disks around them. We use Hipparcos measurements to compute
stellar velocities in the sky plane. The velocity dispersion of
Vega-like stars is found to be systematically smaller than that of the
normal main sequence field stars for all spectral types, suggesting
that the main sequence dusty systems, on average, are younger than
normal field stars. The debris disks seem to survive longer
around late type stars as compared to early type stars. Further, we
find a strong correlation between fractional dust luminosity () and velocity dispersion of
stars with dust disks. Fractional dust luminosity is found to drop off
steadily with increasing stellar age from early pre-main sequence
phase to late main sequence phase.
Key words: stars: circumstellar matter / stars: planetary system / stars: kinematics / stars: pre-main sequence / stars: evolution
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.