Density Wave Streaming Motions in Stars along the Sagittarius Spiral Arm

Details Density Wave Streaming Motions in Stars along the Sagittarius Spiral Arm Density Wave Streaming Motions in Stars along the Sagittarius Spiral Arm

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aj....130.2701f&link_type=abstract

The Astronomical Journal, Volume 130, Issue 6, pp. 2701-2716.

Astronomy and Astrophysics

Astronomy

6

Astronomical Data Bases: Miscellaneous, Galaxy: Structure, Stars: Kinematics, Surveys

Scientific paper

A magnitude-limited photographic survey of relative proper-motion components and B, V photometry of 1.3×106 stars brighter than apparent B magnitude 14.5+/-0.5 in the fourth Galactic quadrant is converted into a distance-limited survey of 3.26×105 stars up to a distance of 500 pc. A streaming motion of 13.5+/-0.5 km s-1 is detected in 4.1×104 Population I stellar candidates with an orbital perigalactic center located at 6.8 kpc<=R<=7.2 kpc, with a Sun location Rsol=8.5 kpc. A density perturbation of ~0.1 Msolar pc-3 in the Galactic field potential at R0~6.8 kpc is interpreted as resulting from the density wave connected with the Sagittarius-Carina spiral arm. A set of 1.4×104 stars of mass ~1.5+/-0.75 Msolar identify a pitch angle of 10deg+/-1deg and a migration time from the Sagittarius spiral arm into the greater solar neighborhood of ~35 Myr.

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