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

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

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...469.1221f&link_type=abstract

Astronomy and Astrophysics, Volume 469, Issue 3, July III 2007, pp.1221-1229

Astronomy and Astrophysics

Astrophysics

2

Surveys, Stars: Kinematics

Scientific paper

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°, midbmid ≤ 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 GMC encounter.
Full Tables [see full text]-[see full text] are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/469/1221

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