Hα Position Determination of the Binary CIRCINUS-X-1

Details Hα Position Determination of the Binary CIRCINUS-X-1 Hα Position Determination of the Binary CIRCINUS-X-1

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..157d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 1/NOV1, P. 157, 1993

Astronomy and Astrophysics

Astronomy

11

Line: Profiles - Binaries: Close - Stars: Individual: Circinus X-1 - Ism: Jets And Outflows

Scientific paper

Circinus X-1 was observed using the Anglo-Australian Telescope and RGO spectrograph on 1992 May 31 (approximate orbital phase 300°), with seeing conditions of ˜1 arcsec. Hα emission was detected from an m mυ ˜ 20.5, reddened star at a position 1.45±0.15 arcsec south of star `L'. This Hα position for Circinus X-1 is in good agreement with an earlier VLBI measurement and a recent photometric and visual identification. The Doppler velocity of the Ha peak is found to be 150±50 km s-1, with the profile appearing skewed towards shorter wavelengths. The striking resemblance between this profile and the `stationary' Hα profile of SS 433 may be further evidence for jet-like activity from Circinus X-1.

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