The reddening and distance of Scorpius X-1

Details The reddening and distance of Scorpius X-1 The reddening and distance of Scorpius X-1

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...171..289k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 171, no. 1-2, Jan. 1987, p. 289-296. Research supported by the Danish Astronom

Astronomy and Astrophysics

Astrophysics

17

Interstellar Extinction, Scorpius Constellation, Ultraviolet Spectra, X Ray Sources, Cosmic Dust, Optical Thickness

Scientific paper

Since its discovery the reddening and distance of Scorpius X-1 have been debated issues. A rediscussion of the 220 nm feature indicates that the reddening of the source may have been overestimated. An alternative reddening 0.080 mag is proposed. New reddening-distance data for about 200 stars in a small area containing Sco X-1 combined with the reddening 0.080 mag suggest a distance range 200 - 300 pc. If a high reddening ≡0.300 mag could be maintained the distance of Scorpius X-1 would be in the range 100 - 400 pc. The smallest and the largest reddenings observed in the area result in upper distance limits for Sco X-1. A comparison of the distribution of E(b-y) < 0.100 lines of sight and the IRAS 100 μm sky fluxes shows that Sco X-1 is located in a low intensity/low reddening region. The source's color excess is probably 0.08 and its distance ≡250 pc.

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