The optical counterpart of Aquila X-1 /3U 1908+00/

Details The optical counterpart of Aquila X-1 /3U 1908+00/ The optical counterpart of Aquila X-1 /3U 1908+00/

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220l.131t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 220, Mar. 15, 1978, p. L131-L134.

Astronomy and Astrophysics

Astrophysics

62

Stellar Spectrophotometry, Variable Stars, X Ray Sources, Astronomical Photography

Scientific paper

We have discovered a highly variable star very close to the center of the SAS 3 error circle for the flaring X-ray source Aquila X-1 (3U 1908+00). Photographic photometry over the last 4 years shows covariability; the optical counterpart brightens from B greater than 20 to B approximately 17 mag during times of X-ray outburst, thus establishing the identification. Spectrophotometry of this star during its quiescent state shows spectral features of a K0 star with no obvious peculiarities; its distance must be at least 1.7 kpc.

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