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See detailInvestigations of typical stellar spectra with high dispersion. I. Table of lines in α Cygni.
Struve, Otto; Swings, Polydore ULg

in Astrophysical Journal (1941), 94

This paper contains a new table of wave lengths of absorption lines in the spectrum of α Cygni between λ 3862 and λ 6590.

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See detailThe spectrum of comet Cunningham, 1940C.
Swings, Polydore ULg; Elvey, C.-T.; Babcock, H.-W.

in Astrophysical Journal (1941), 94

Slit spectrograms of Comet Cunningham secured at the McDonald Observatory reveal well-resolved ultraviolet bands due to OH and NH; only the lines of low rotational quantum number are observed, as in the ... [more ▼]

Slit spectrograms of Comet Cunningham secured at the McDonald Observatory reveal well-resolved ultraviolet bands due to OH and NH; only the lines of low rotational quantum number are observed, as in the case of CH. The abundances of OH and NH molecules seem to be of the same order as that of CN. Each branch of the violet bands of CN has two maxima, one corresponding to a rotational distribution for T  400° K and one corresponding to T  50° K. The tail bands of CN are absent. The authors discuss the variation with heliocentric distance of the relative intensities of the vibrational transitions. The rotational intensity distribution and the extension of the different bands in the head have been investigated. The cometary bands of CH belonging to the two electronic transitions, A2∆ → x2∏ (near λ 43oo) and B2∑- → x2∏ (near λ 3900), are described. The bands observed between λ 4000 and λ 4130 are discussed but remain unidentified. [less ▲]

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See detailSpectrographic observations of peculiar stars. II.
Swings, Polydore ULg; Struve, Otto

in Astrophysical Journal (1941), 94

RX Puppis.-Besides the strong emission lines of H, He I, and He II, this star is characterized by very intense lines of [Fe VII]; other highly ionized elements observed in the spectrum are [Ne V], [Fe VI ... [more ▼]

RX Puppis.-Besides the strong emission lines of H, He I, and He II, this star is characterized by very intense lines of [Fe VII]; other highly ionized elements observed in the spectrum are [Ne V], [Fe VI], and [Ca VII]. The object is very similar to CI Cygni; but the evidence for a late-type component is not as definite. The behavior of the forbidden lines is discussed. Recent variations in the spectra of T Coronae Borealis, Z Andromedae, RW Hydrae, RS Ophiuchi, and AX Persei.-These five objects combine bright lines of high excitation and late-type spectra. In all cases their line-emission spectra observed in the last few years behave in the same way as in novae in their nebular stages; but the ejection velocities are smaller than in single novae, even of the slow type. γ Cassiopeiae.-The observations obtained in 1940 and 1941 were used to determine the contours of the broad lines from the reversing layer. These lines became gradually stronger as the lines produced by the outer shell grew weaker. The optical thickness for continuous radiation of the shell near its maximum development was about τr = 0.2. 14 Comae Berenices.-The spectrum of this star consists of (1) an A5 component of moderate luminosity whose H lines show strong Stark effect and whose lines of Mg II, Si II, Fe II, and Fe I show rapid axial rotation and (2) the spectrum of a shell, which is responsible for sharp Hα but which is otherwise weak in H; the shell also gives rise to sharp lines of Ti II, Cr II, Sc II, Ca II, etc., and resembles the spectrum of Є Aurigae, except that H is much weaker and that the excitation temperature is lower. Some spectroscopic peculiarities of the shell may be accounted for by the hypothesis that the pressure within the shell is lower (perhaps by a factor of 10 or 100) than in normal supergiant reversing layers. [less ▲]

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See detailThe interstellar absorption lines of molecular origin
Swings, Polydore ULg

in Journal of the Royal Astronomical Society of Canada (1941), 35

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See detailComplex structure of cometary bands tentatively ascribed to the contour of the solar spectrum
Swings, Polydore ULg

in Lick Observatory Bulletin (1941), 19

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See detailThe spectrum of the night sky.
Elvey, C.-T.; Swings, Polydore ULg; Linke, Walter

in Astrophysical Journal (1941), 93

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See detailThe spectra of two peculiar stars: MWC 17 and CD -27°11944.
Swings, Polydore ULg; Struve, Otto

in Astrophysical Journal (1941), 93

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See detailErratum.
Swings, Polydore ULg

in Astrophysical Journal (1941), 94

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See detailThe evolution of a peculiar stellar spectrum: Z Andromedae.
Swings, Polydore ULg; Struve, Otto

in Astrophysical Journal (1941), 93

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See detailThe spectrum of the Shell of PLEIONE.
Struve, Otto; Swings, Polydore ULg

in Astrophysical Journal (1941), 93

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See detailThe emission lines in the spectra of B 1985 and WY Geminorum.
Swings, Polydore ULg; Struve, Otto

in Astrophysical Journal (1941), 93

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See detailTwo interesting nuclei of planetary nebulae: IC 418 and NGC 40
Swings, Polydore ULg; Struve, Otto

in Proceedings of the National Academy of Sciences of the United States of America (1941), 27

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See detailA contribution to the study of β Canis Majoris.
Struve, Otto; Swings, Polydore ULg

in Astrophysical Journal (1941), 94

Coudé spectrograms obtained at the McDonald Observatory on January 22 and 24, 1941, show a velocity range of about 9 km/sec, in a period of 6 hours. The lines are diffuse and shallow near minimum velocity ... [more ▼]

Coudé spectrograms obtained at the McDonald Observatory on January 22 and 24, 1941, show a velocity range of about 9 km/sec, in a period of 6 hours. The lines are diffuse and shallow near minimum velocity and sharper and deeper near maximum velocity. The Ca II line K shares in the oscillations. It is probably a blend of a stellar and an interstellar line. The lines suggest turbulence of an appreciable amount. A line at λ 4469.71 is probably a blend of O II and forbidden He I. A comparison with β Cephei shows that β Canis Majoris is more luminous. It is, however, not a supergiant. The similarity in the periods suggests similarity of internal structure. [less ▲]

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See detailOn the emission lines in the spectrum of BD +20° 2465
Swings, Polydore ULg; Struve, Otto

in Publications of the Astronomical Society of the Pacific [=PASP] (1941), 53

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See detailVariations in the spectrum of HD 108
Swings, Polydore ULg; Struve, Otto

in Publications of the Astronomical Society of the Pacific [=PASP] (1941), 53

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See detailThe spectrum of Nova Monocerotis, 1939
Swings, Polydore ULg; Struve, Otto

in Publications of the Astronomical Society of the Pacific [=PASP] (1941), 53

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See detailProblèmes physiques des atmosphères des Novae et des astres présentant des analogies spectrales avec les Novae.
Swings, Polydore ULg

in Actualités Scientifiques et Industrielles (1941), 896

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