Scorpius XR-1: Some X-Ray and Optical Observations (1969 May)

Burginyon, G. A.; Grader, R. J.; Hill, Randal M.; Price, R. E.; Rodrigues, R.; Seward, F. D.; Swift, C. D.; Hiltner, W. A.; Mannery, Edward J.

doi:10.1086/150599

Cited by 10 publications

(3 citation statements)

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“…These correlations have been confirmed by further observations by Pelling (1972) Results of simultaneous X-ray and optical observations of Sco X-l for eight rocket flights (Burginyon et al, 1970). Fig.…”

Section: Universal Time (Thousands Of Seconds)supporting

confidence: 74%

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Simultaneous X-Ray, Optical and Radio Observations of Galactic X-Ray Sources

Hiltner

1973

Symp. - Int. Astron. Union

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Simultaneous observations of the X-ray source Sco X-1 are reviewed and discussed. Several conclusions can be drawn from the observations. (a) There is no correlation of the radio intensities with either the optical or X-ray intensities. (b) The X-ray intensity is high and variable only when the blue optical magnitude is brighter than 12.6–12.7. (c) There is often correlation of X-ray and optical flares, but the relationship is not one to one.Attention is called to the paucity of simultaneous observations of other identified X-ray sources.

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Section: Universal Time (Thousands Of Seconds)supporting

confidence: 74%

“…The earliest attempt to make simultaneous observations has been reported by Burginyon et al (1970). Eight rocket flights were made while the optical counterpart of Sco X-l was monitored for blue magnitude.…”

Section: Universal Time (Thousands Of Seconds)mentioning

confidence: 99%

Simultaneous X-Ray, Optical and Radio Observations of Galactic X-Ray Sources

Hiltner

1973

Symp. - Int. Astron. Union

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“…The value of N Hx for Sco X-l obtained with ( 4a) is (30-40) x 10 20 cm" 2 (Grader et al, 1970a;Burginyon et al, 1970), whereas the 21 cm emission line intensity gives about 10xl0 20 cm" 2 (Goldstein and MacDonald, 1969). The difference has been interpreted as due to circumstellar cold matter.…”

Section: J(e) = a (E) Q (£) A (E) = Exp [ -N H mentioning

confidence: 98%

Absorption and Production of Soft X-Rays in the Galaxy

Hayakawa

1973

Symp. - Int. Astron. Union

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The column densities of interstellar hydrogen to X-ray sources derived from their spectra are compared with those obtained from 21 cm radio observations. Referring to several observed results on Cyg X-2, Cygnus Loop etc., the interpretation of the low energy cut-off of the spectrum in terms of the interstellar absorption is subject to ambiguities due to a modification of the emission spectrum by Compton scattering in the sources and the contribution of emission lines.The result of soft X-ray sky surveys indicates that the diffuse component of soft X-rays consists of the extragalactic and the galactic components. The former has a hard component with a power law spectrum and a soft component which may be represented by an exponential spectrum. The galactic component is so soft that its spectrum may also be explained by thermal bremsstrahlung of temperature of about 0.1 keV. Its generation rate may account for the heating and ionization of interstellar matter. It is suggested that galactic diffuse soft X-rays are produced by active stars of a rather high number density.

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Absorption and Production of Soft X-rays in the Galaxy

Hayakawa

1973

X- And Gamma-Ray Astronomy

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Scorpius XR-1: Some X-Ray and Optical Observations (1969 May)

Cited by 10 publications

References 0 publications

Simultaneous X-Ray, Optical and Radio Observations of Galactic X-Ray Sources

Simultaneous X-Ray, Optical and Radio Observations of Galactic X-Ray Sources

Absorption and Production of Soft X-Rays in the Galaxy

Absorption and Production of Soft X-rays in the Galaxy

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