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  1. Article

    Open Access

    Near-infrared sky background fluctuations at mid- and low latitudes

    The emission of the upper atmosphere introduces an additional variable component into observations of astronomical objects in the NIR 700–3,000 nm range. The subtraction of this component is not easy because i...

    G. Moreels, J. Clairemidi, M. Faivre, D. Pautet… in Experimental Astronomy (2008)

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  2. Article

    Jets And Arcs In The Coma Of Comet Hale-Bopp From August 1996 To April 1997

    An observation program for measuring the activity of Comet Hale-Bopp was conducted at the Observatoire de Haute Provence from August 1996 to April 1997. Narrow band images were obtained from the 120 cm telesco...

    CÉLINE LAFFONT, P. ROUSSELOT, J. CLAIREMIDI, G. MOREELS… in Earth, Moon, and Planets (1997)

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  3. No Access

    Chapter and Conference Paper

    Spectroscopic Evidence of Organic Molecules Released by the Dust of Halley’s Inner Coma

    New spectroscopic arguments supporting the probable presence of organic molecules in the material released by comet Halley are deduced from the data obtained by the Vega three-channel spectrometer. Two excesse...

    J. Clairemidi, P. Rousselot, G. Moreels in Origin and Evolution of Interplanetary Dust (1991)

  4. No Access

    Chapter and Conference Paper

    Spatial Distribution and Color of Dust in Halley’s Inner Coma

    Composite images of the intensity of solar radiation scattered by dust in Halley’s coma are constructed by using the three-channel spectra obtained during the approach phase of the Vega 2 spacecraft They cover...

    J. Clairemidi, E. Brandon, P. Rousselot… in Origin and Evolution of Interplanetary Dust (1991)

  5. No Access

    Chapter and Conference Paper

    Properties of dust in comet P/Halley measured by the Vega-2 three-channel spectrometer

    Optical properties of cometary dust exhibit no substantial variations at distances from 100 to 15 000 km from the nucleus. Dust ejection can be approximated by cos φ where φ is the angle with the sun-nucleus axis...

    V. A. Krasnopolsky, V. I. Moroz, A. A. Krysko… in Exploration of Halley’s Comet (1988)

  6. No Access

    Chapter and Conference Paper

    Spectrophotometry of comet P/Halley at wavelengths 275—710 nm from Vega 2

    Spectrophotometric observations of the inner coma of comet Halley in the range 275-710 nm were conducted from Vega 2 on March 8, 9, 10, 11, 1986. During the encounter session, when the impact parameter was min...

    G. Moreels, J. Clairemidi, J. P. Parisot, J. M. Zucconi… in Exploration of Halley’s Comet (1988)

  7. Article

    Corrigendum: Near-ultraviolet and visible spectrophotometry of comet Halley from Vega 2

    G. Moreels, M. Gogoshev, V. A. Krasnopolsky, J. Clairemidi, M. Vincent… in Nature (1986)

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  8. No Access

    Article

    Spectroscopic study of comet Halley by the Vega 2 three-channel spectrometer

    The three-channel spectrometer (TKS) aboard the Vega 2 spacecraft recorded infrared and visible spectra near the nucleus of comet Halley. Spectra in the range 0.95–1.9 µm at a distance of 300 km from the nucle...

    V. A. Krasnopolsky, M. Gogoshev, G. Moreels, V. I. Moroz, A. A. Krysko… in Nature (1986)

  9. No Access

    Article

    Near-ultraviolet and visible spectrophotometry of comet Halley from Vega 2

    We report results obtained by the near-ultraviolet and visible channel (V) of the TKS instrument1 carried by Vega 2 during the hour preceding its closest approach to comet Halley. The brightness of the OH (0, 0) ...

    G. Moreels, M. Gogoshev, V. A. Krasnopolsky, J. Clairemidi, M. Vincent… in Nature (1986)

  10. No Access

    Article

    Ejections of massive objects from the center of a stellar disk

    We study numerically the behavior of a stellar disk when objects are ejected from the central part of the disk and out of its plane. The arms and distortions that occur in the systems are more pronounced when ...

    S. Clairemidi, J. Clairemidi in Astrophysics and Space Science (1980)

  11. No Access

    Article

    Ejections of massive objects from the center of a stellar disk

    Considering the possibility that massive objects might be ejected from the central parts of galaxies, we have investigated the effects of such a phenomenon on the parent galaxy. A galaxy is represented by a di...

    S. Clairemidi, J. Clairemidi in Astrophysics and Space Science (1980)