An indirect measurement of the galactic center distance

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrometry, Galactic Structure, Milky Way Galaxy, Nebulae, Distance, Galactic Nuclei, H Ii Regions, Kinematics, Neutral Gases, Oort Cloud

Scientific paper

The sun-galactic center distance R0 is calculated using observational data in neutral hydrogen, OB stars and H II regions with their exciting stars. The method consists in the calibration of the scale of the kinematic distances to hydrogen features by comparisons with the photometric distances of OB stars coexisting with these features. An iterative, numeric procedure taking R0 as a variable parameter gives a range R0 greater than 7.8 kpc and less than 9.2 kpc with a mean value of 8.5 kpc for the best agreement between both distance scales. This result is consistent with a value R0 = 8.4 kpc obtained from comparisons between kinematic distances of H II regions and photometric distances of their exciting stars. These values do not differ essentially from R0 = 8.7 + or - 0.7 kpc as obtained by Oort and Plaut using RR Lyrae stars.

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