From: Lee Corbin (lcorbin@tsoft.com)
Date: Wed Feb 05 2003 - 16:07:42 MST
Amara writes
> "The Sun should enter the Apex Cloud (a 'cloudlet' of the
> Aquila-Ophiuchus cloud, located within 5 pc of the Sun) within
> ~10^4 years."
Whew! The first time I read that I thought you
said 10^2 years. Thank goodness it's really
ten thousand years! That was a close one!
Lee
> -------------------------------------------
>
> http://it.arxiv.org/abs/astro-ph/0302037
>
> Astrophysics, abstract
> astro-ph/0302037
>
> From: Priscilla Chapman Frisch <frisch@oddjob.uchicago.edu>
> Date: Mon, 3 Feb 2003 21:50:08 GMT (8kb)
>
>
> Local Interstellar Matter: The Apex Cloud
>
> *Authors:* P. C. Frisch
>
> Several nearby individual low column density interstellar cloudlets
> have been identified based on kinematical features evident in
> high-resolution CaII observations near the Sun. One of these
> cloudlets, the ``Aquila-Ophiuchus'' cloud, is within 5 pc of the Sun
> and located in the solar apex direction. The velocity vector of this
> Apex Cloud is reevaluated and components at this velocity are found
> towards 17 stars with distances 1--60 pc, and located primarily in
> the galactic center hemisphere. The AC has a heliocentric velocity
> of ~--35 km/s, and is approaching the Sun from an upstream direction
> close to the bulk flow of ISM past the Sun (Frisch et al. 2002).
> Interstellar absorption consistent with the velocity of the AC is
> seen towards the nearest star $\alpha$ Cen, resolving a long
> standing puzzle and indicating that indeed this cloud will be the
> next interstellar cloud encountered by the Sun. The Sun should enter
> the AC within $\sim 10^4$ years.
>
>
> --
>
> Amara Graps, PhD
> Istituto di Fisica delle Spazio Interplanetario (IFSI)
> Consiglio Nazionale delle Ricerche (CNR), Roma, ITALIA
> Amara.Graps@ifsi.rm.cnr.it
>
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