References of "Arpigny, Claude"
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See detailSpectroscopy, photometry and direct filter imagery of Comet P/Halley
Arpigny, Claude ULg; Dossin, F.; Manfroid, Jean ULg et al

in The Messenger (1986), 45

Observational techniques and instrumentation applied in ground-based studies of the cometary coma during the post-perihelion phase of the recent passage of Comet Halley are summarized. Applications of a 1 ... [more ▼]

Observational techniques and instrumentation applied in ground-based studies of the cometary coma during the post-perihelion phase of the recent passage of Comet Halley are summarized. Applications of a 1.5 m telescope equipped with a coude spectrograph for long slit investigations of spectral intensity distributions, a 1.4 m CAT, coude echelle spectrometer and reticon to evaluate the C-12/C-13 isotopic abundance ratio, and a 50 cm photometric telescope for narrow bandwidth spectroscopy are described. Finally, the 1.5 m Danish telescope, equipped with a CCD camera, collected high spatial resolution photographs of the various coma components when the comet was 0.42 AU from the sun. [less ▲]

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See detailThe Al/Mg abundance ratio in halo stars
Arpigny, Claude ULg; Magain, Pierre ULg

in Astronomy and Astrophysics (1983), 127

The Al to Mg abundance ratio is redetermined in two extreme metal-poor stars, HD 19445 and HD 140283, on the basis of accurate spectral material. It is found that: (1) one of the two lines used for the Al ... [more ▼]

The Al to Mg abundance ratio is redetermined in two extreme metal-poor stars, HD 19445 and HD 140283, on the basis of accurate spectral material. It is found that: (1) one of the two lines used for the Al abundance determination is blended by CH lines; (2) no anomalous difference appears between the hotter and the cooler star, both showing an Al overdeficiency; (3) the observations are in fair agreement with predictions from the theory of explosive carbon burning. [less ▲]

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