Bonsoir Claude,

J'ai mis ce lien unique sur mon site, car sur le site du CDS, il n'y a
pas de lien direct pour télécharger le catalogue complet (c'est le site
FTP en petit au haut de l'écran qui nous y mène).

Au plaisir,

Pierre




Claude Duplessis wrote:
>
>
> Merci Pierre pour les précisions sur NGC 2818 et 2818A ! Ainsi que
> l'info sur le catalogue de Lynga.
>
> Je trouve que de plutôt répliquer le dépôt du catalogue de Lynga sur
> ton site, tu aurais très bien pu fournir la source officielle de
> l'université de Strasbourg ou sont regrouper tous les catalogues:
> http://cdsarc.u-strasbg.fr/viz-bin/ftp-index?VII/92A
>
> Ca me semble plus simple de faire un lien ! Merci, Claude
>
> Pierre Paquette wrote:
> >
> >
> > Bonsoir,
> >
> > Je suggère d'afficher ce message avec une police («font») de
> > largeur fixe comme Monospace. Et je m'excuse pour l'anglais.
> >
> > Selon «Star Clusters», de Brent A. Archinal et Steven J. Hynes
> > (Willmann-Bell, 2003):
> >
> > Name Type h min s deg min con Tr.type diam mag nb* mag*br magsur
> > distpc sa u2k ref NGC 2818 clpn 09 16 10 –36 37.1 Pyx III1m n 8.0
> > 8.2 298 11.32 12.7 3221 20 170 4 The NGC designation applies to the
> > cluster and planetary nebula. Aliases: Cr 206; Lund 497; Mel 96;
> > OCl 743; Raab 82; Dunlop 564; h 3154; vdB-Ha 59; C0914–364
> >
> > NGC 2818 = C0914–364: The first observation of this object was made
> > by James Dunlop [1828] from Paramatta, in New South Wales,
> > Australia, and was cataloged by him as Δ564. He noted the cluster
> > first with a smaller nebulosity involved. John Herschel also
> > observed this field, listing it as h 3154 and describing it as a
> > planetary nebula in the field of an open cluster. In the NGC
> > description it appears that the 2818 designation is applied
> > specifically to the planetary nebula. However, to complicate
> > matters, its presence in the cluster is mentioned, but the cluster
> > is not given any separate designation. Arguably, from the
> > historical records, the designation NGC 2818 could be said to apply
> > to the cluster/planetary nebula combination, but this may cause
> > confusion. In an attempt to resolve the matter, Sulentic and Tifft
> > [1973] split the two objects in the RNGC, calling the open cluster
> > NGC 2818 and the planetary nebula NGC 2818A. However, there are no
> > historical grounds for this, and we feel that this designation
> > should be avoided. A more satisfactory solution might be to
> > identify the planetary nebula as NGC 2818, and identifying the
> > cluster by one of its alternative designations, Melotte 96 or
> > Collinder 206.
> >
> > Of course, the presence of a planetary nebula within an open
> > cluster might just be a projection effect, as it is in the more
> > well-known case of NGC 2438 and the cluster NGC 2437 (= M 46).
> > Evidence of a genuine physical association in the case of NGC
> > 2818/2817A, though, was first provided by Tifft, et al., [1972] who
> > noted that the radial velocity of the nebula was similar to that of
> > two stars in the cluster. Further observational evidence of the
> > association was also presented by Dufour [1984] based on an
> > analysis of its physical properties and chemical composition. This
> > occurrence is very important in the study of planetary nebulae,
> > which are notoriously difficult to investigate because of the
> > problems of measuring their distance. In this instance the
> > distance, size and progenitor mass can be determined to an unusual
> > degree of accuracy. The cluster itself is not otherwise
> > particularly exceptional, being an intermediate-age Population I
> > grouping at a distance of some 3.5kpc.
> >
> > Brian Skiff [private communication 1995] gives a position for the
> > cluster of approximately (2000.0) 09h 16m 10s –36° 36.1', a value
> > which is used here. He also gives the position of the planetary
> > nebula as (2000.0) 09h 16m 01.48s –36° 37' 36.5" and notes it is
> > GSC 7164–3813.
> >
> > Le catalogue de Lynga (rendu obsolète par le New catalog of
> > optically visible open clusters and candidates (V2.8) de Dias W.S.,
> > Alessi B.S., Moitinho A., Lepine J.R.D., dans Astronomy &
> > Astrophysics vol. 389, no. 871, paru en 2002) est disponible sur
> > mon site et contient 1151 entrées:
> > http://cielprofond.info/Lynga.zip
> > <http://cielprofond.info/Lynga.zip>
> > <http://cielprofond.info/Lynga.zip
> > <http://cielprofond.info/Lynga.zip>>
> >
> > Bonnes observations!
> >
> > Pierre Paquette