RE: Our next cloud

From: Lee Corbin (lcorbin@tsoft.com)
Date: Wed Feb 05 2003 - 16:07:42 MST

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    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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