Vertical distribution of Galactic disk stars
نویسندگان
چکیده
منابع مشابه
Vertical distribution of Galactic disk stars ⋆
Nearly 400 Tycho-2 stars have been observed in a 720 square degree field in the direction of the North Galactic Pole with the high resolution echelle spectrograph ELODIE. Absolute magnitudes, effective temperatures, gravities and metallicities have been estimated, as well as distances and 3D velocities. Most of these stars are clump giants and span typical distances from 200 pc to 800 pc to the...
متن کاملVertical distribution of Galactic disk stars : ⋆ II . The surface mass density in the Galactic plane
High resolution spectra data of red clump stars towards the NGP have been obtained with the high resolution spectrograph Elodie at OHP for Tycho-2 selected stars. Combined with Hipparcos local analogues, we determine both the gravitational force law perpendicular to the Galactic plane, and the total surface mass density and thickness of the Galactic disk. The surface mass density of the Galacti...
متن کاملThe Distribution of Galactic Disk Stars in Baade’s Window
The color-magnitude diagram of ∼ 3×10 stars obtained for Baade’s Window towards the Galactic bulge with the OGLE project reveals a surprisingly narrow main sequence due to galactic disk stars at a distance of d ∼ 2 kpc, i.e. at the location of the Sagittarius spiral arm. A more careful analysis indicates there is an excess in the number of disk stars by a factor ∼ 2 between us and d ∼ 2.5 kpc a...
متن کاملThe Vertical Distribution and Kinematics of HI and Mass Models of the Galactic Disk
We present full modelling of tangent point emission of HI as seen in the 21cm transition in the inner Galaxy. We measure the scale height and velocity dispersion of HI as a function of Galactic radius besides the rotation curve and the z-centroid of the atomic layer. The model used takes into account emission from a large path length along the line of sight, corresponding to an interval ( R) of...
متن کاملNearby stars of the Galactic disk and halo
Model atmosphere analyses of échelle spectra of some fifty nearby Fand G-type stars are presented. The sample is confined to the main-sequence, turnoff and subgiant region, regardless of the metal abundance. On the base of these data, spectroscopic parallaxes are calculated and compared to the Hipparcos astrometry to explore the reliability of the derived stellar parameters, notably the surface...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20078788