A study of the Galactic halo from a complete sample of RR Lyrae variables to B = 21

Details A study of the Galactic halo from a complete sample of RR Lyrae variables to B = 21 A study of the Galactic halo from a complete sample of RR Lyrae variables to B = 21

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..433h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Jan. 15, 1984, p. 433-448.

Astronomy and Astrophysics

Astronomy

68

Cepheid Variables, Halos, Space Density, Stellar Spectrophotometry, Stellar Structure, Galactic Nuclei, Radial Velocity, Star Distribution

Scientific paper

An automated search of a sequence of 1.2-m Schmidt plates is used to obtain a complete sample of RR Lyrae variables to B = 21. The sample is used to trace the space density of the halo to 60 kpc. A power-law distribution with index -3.1±0.2 is found, with an axial ratio of about 0.9. Radial velocities of sample members as a function of Galactocentric distance give a power-law relation with index -0.7±0.4 for the overall mass density; this is different from the distribution of the variables themselves and apparently shows the distribution of unseen matter.

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