Galactic Distribution, Radial Velocities and Masses of PN
نویسندگان
چکیده
منابع مشابه
Radial velocities of planetary nebulae towards the Galactic bulge
Accurate radial velocities for a sample of 71 planetary nebulae, mostly located in the direction of the Galactic Centre, are presented. Most of the nebulae discussed in this paper are likely members of the Galactic bulge, based on their radial velocity, longitude and derived distance. The data give a large improvement over existing catalogues, doubling the sample of bulge planetary nebulae with...
متن کاملRadial Velocities of Stars in the Galactic Center 1
We present results from K band slit scan observations of a ∼20×20 region of the Galactic center (GC) in two separate epochs more than five years apart. The high resolution (R = λ ∆λ ≥14, 000) observations allow the most accurate radial velocity and acceleration measurements of the stars in the central parsec of the Galaxy. Detected stars can be divided into three groups based on the CO absorpti...
متن کاملGAIA Spectroscopy and Radial Velocities
GAIA spectroscopic and radial velocity performancies are reviewed on the base of groundbased test observations and simulations. The prospects for accurate analysis of stellar atmospheres (temperature, gravity, chemical abundances, rotation, peculiarities) and precise radial velocities (single stars, binaries, pulsating stars) are colorful provided the spectral dispersion is high enough. A highe...
متن کاملRadial velocities and iron abundances of field
This is the second of the papers devoted to derive radial velocities and iron abundances of field RR Lyraes observed by HIPPARCOS. Our abundances show good agreement with those in the literature obtained both from photometric (∆S index) and spectroscopic methods. Binary candidates and stars misclassified as RR Lyraes in the original HIPPARCOS list have been also identified.
متن کاملMasses of Compact Galactic Objects
Andrew Gould (Ohio state University) and B. Scott Gaudi (Ohio state University) 5 Using the technique of gravitational microlensing, SIM Lite will conduct a representative census of all compact Galactic objects from brown dwarfs to black holes, including white dwarfs, neutron stars, and main sequence stars. The masses of these objects will be derived from a combination of precise measurement of...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1989
ISSN: 0074-1809
DOI: 10.1017/s0074180900137660