Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..104n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. 104-115.
Astronomy and Astrophysics
Astrophysics
39
Galactic Mass, Galactic Structure, Horizontal Branch Stars, Milky Way Galaxy, Blue Stars, Line Of Sight
Scientific paper
The results of a search for blue horizontal branch (BHB) stars at galactocentric distances of about 40-65 kpc are reported. Heliocentric line-of-sight velocities are presented for 10 horizontal branch stars in this distance interval and are used to place constraints on the extent and mass of the Galaxy's dark corona. The dispersion of the radial component of galactocentric velocity of this group of objects is 111 + or - 25 km/s. It is inferred that the mass of the dark corona continues to grow out to at least 40 kpc. If the stellar orbits are isotropic, the data show little evidence of a departure from a flat rotation curve having a vc of about 200 km/s, and the mass within kpc is about 6 x 10 to the 11th solar masses. If the orbits are radial, the data for the horizontal branch stars may be interpreted in terms of a corona which extends out to only about 40 kpc, and in this case the Galaxy mass is 5(+2 -1) x 10 to the 11th solar masses.
Hawkins R. S. M.
Norris John. E.
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