Direct evidence for a massive galactic halo

Details Direct evidence for a massive galactic halo Direct evidence for a massive galactic halo

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.303..406h&link_type=abstract

Nature (ISSN 0028-0836), vol. 303, June 1983, p. 406-408.

Other

24

Giant Stars, Milky Way Galaxy, Stellar Spectrophotometry, Balmer Series, Mass Distribution, Radial Velocity, Stellar Color, Stellar Spectra

Scientific paper

The discovery of a very distant galactic RR Lyrae star, R15, is reported, and spectroscopic observations are used to show that the star has a high negative radial velocity, implying a lower limit to the mass of the galaxy of 1.4 x 10 to the 12th solar masses. The photometric observations favoring the interpretation of the star as an RR Lyrae star are discussed, and the spectrum is shown. On the assumption that the star is in the galactic halo the value 0.9 is adopted for its absolute magnitude, and its distance is taken to be 8.7 kpc. The lower limit to the mass of the galaxy is derived and shown to be in good agreement with values obtained by other, independent methods.

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