Sydney observatory Galactic survey Potential for detection of extreme disk-crossing stars

A. Fresneau*, A. E. Vaughan, R. W. Argyle

*Corresponding author for this work

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    8 Citations (Scopus)
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    Context. First Epoch astrometric and radiometric information of a survey in the optical along the Galactic fourth quadrant is archived for further analysis in the time-domain. Aims. A photographic survey of 1.9 × 106 stars down to B-magnitude 14 × 0.5 along the galactic meridian l = (330 ± 5)°, -64° ≤ b ≤ -7° and along the galactic equator 272° ≤ l ≤ 341°, |b| ≤ 7°, is provided from century old astrographic plates of Sydney Observatory. Stellar candidates to investigate the Galaxy disk kinematics up to a distance of 1 kpc from the Sun are tentatively selected. Methods. The early data are combined with late epoch observations into a set of 4.8 × 105 stars with significant proper motion μ ≥ 0.005× yr-1 and approximate color B - V. The selection effects and the kinematical bias on the stellar system are investigated. F-G stellar candidates with a mean transverse velocity dispersion of 45 km s -1 are suggested. Results. The spin rate of 1/2° pc-1 of the velocity ellipsoid along its long axis is observed over half a thickness of 25 pc of the galactic disk for stars at an estimated distance D ≤ 300 pc from the Sun. Conclusions. A catalogue of 4.8 × 105 stars is provided for further investigation of the galactic disk heating by transient spiral wave or by CMC encounter.

    Original languageEnglish
    Pages (from-to)1221-1229
    Number of pages9
    JournalAstronomy and Astrophysics
    Issue number3
    Publication statusPublished - Jul 2007

    Bibliographical note

    Copyright 2007 EDP Sciences, First published in Astronomy and astrophysics, Volume 469, published by EDP Sciences. The original article can be found at


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