n < 2 Allowed Transitions in Neutral Sulfur within in the Visible and Infrared Spectral Ranges

in Astronomy and Astrophysics. Supplement Series (1993), 102

A photometric study of the bright cloud B in Sagittarius. VII - 1165 new variable stars and 65 diffuse objects

in Astronomy and Astrophysics. Supplement Series (1991), 90

A field in the Sagittarian bright cloud in the direction of the Galactic center is investigated by means of the B, V, and R Schmidt plates at the ESO, and 1165 variable stars are reported. The position, R ... [more ▼]

A field in the Sagittarian bright cloud in the direction of the Galactic center is investigated by means of the B, V, and R Schmidt plates at the ESO, and 1165 variable stars are reported. The position, R magnitudes, epochs, and amplitudes of variation are given for each star, and the surface density per square degree of variable stars increases from 1.7 to 65. The number of variables in the present field is similar to that for field A, and variables of type L and/or M are more densely numerous toward the center of the Galaxy than at other locations. Of the objects listed, 65 are given with potential classifications based on morphological data from the B and R Schmidt plates. The preliminary observations suggest a success rate of 42 percent on the precise prediction of the object types. [less ▲]

General catalogue of Ap and Am stars

in Astronomy and Astrophysics. Supplement Series (1991), 89

A catalog of all the known Ap and Am stars, containing a total of 6684 objects, was prepared. The few stars that were wrongly considered as Ap or Am star are noted as well as some others for which their ... [more ▼]

A catalog of all the known Ap and Am stars, containing a total of 6684 objects, was prepared. The few stars that were wrongly considered as Ap or Am star are noted as well as some others for which their identity as Ap or Am stars is not yet well established. The catalog gives the identificators and the main observational data for each star, including the magnitude, color, spectral type, duplicity, periodicity, magnetic field, and projected rotational velocity. [less ▲]

A database of Ap stars

in Astronomy and Astrophysics. Supplement Series (1991), 89

A database for 3195 Ap stars, which can be used on an IBM-compatible personal computer, is described. It is essentially based on Renson's general catalogue of Ap and Am stars, but contains much additional ... [more ▼]

A database for 3195 Ap stars, which can be used on an IBM-compatible personal computer, is described. It is essentially based on Renson's general catalogue of Ap and Am stars, but contains much additional information. It operates within the Dbase III Plus system. [less ▲]

Second supplement to the catalogue of observed periods of Ap stars

in Astronomy and Astrophysics. Supplement Series (1991), 87

Supplementary data on the periods of Ap stars with references are presented 20 new stars are introduced for which a periodic variability has been discovered since 1987 or it was known before but it was ... [more ▼]

Supplementary data on the periods of Ap stars with references are presented 20 new stars are introduced for which a periodic variability has been discovered since 1987 or it was known before but it was not reported in the previous issues of this catalogue. For many of the stars in the previous catalogues new determinations of the period are introduced. Recently attributed variable star names are also reported. [less ▲]

The chemical composition of the extreme halo stars. III - Equivalent widths of 20 dwarfs

in Astronomy and Astrophysics. Supplement Series (1990), 86

In the first two papers of this series the chemical composition of 20 extreme halo stars was discussed. The abundances of a number of elements were determined using model atmosphere analysis of equivalent ... [more ▼]

In the first two papers of this series the chemical composition of 20 extreme halo stars was discussed. The abundances of a number of elements were determined using model atmosphere analysis of equivalent widths. In this paper a tabulation of the equivalent width data is presented. A comparison of the measurements with the equivalent widths from different sources is used to assess the quality of the data. [less ▲]

Infrared photometry and spectrophotometry of SN 1987A. I - March to October 1987 observations

in Astronomy and Astrophysics. Supplement Series (1989), 80

IR (1-20 micron) observations, photometry, and narrow band spectrophotometry of SN 1987A obtained between March 16 and October 12, 1987, are presented. Variations of the bolometric luminosity are ... [more ▼]

IR (1-20 micron) observations, photometry, and narrow band spectrophotometry of SN 1987A obtained between March 16 and October 12, 1987, are presented. Variations of the bolometric luminosity are determined from IR and optical photometry. The spectral energy distribution, effective radius, and effective temperature of the hotter component are derived. Also, observations of hydrogen lines and CO emission are discussed. [less ▲]

Liste des étoiles Ap et Am dans des amas ouverts

in Astronomy and Astrophysics. Supplement Series (1988), 76

We have established a catalogue of the stars that are in the field of open clusters among all those which appear in the general catalogue of Ap and Am stars.

Study of AG Carinae. I - The 1977 spectrum of the star

in Astronomy and Astrophysics. Supplement Series (1988), 73

Spectroscopic observations of the variable P Cygni-like star AG Car have been obtained in February 1977. At this epoch, the star was in a relative minimum phase (V = 7.6) observed during a long and ... [more ▼]

Spectroscopic observations of the variable P Cygni-like star AG Car have been obtained in February 1977. At this epoch, the star was in a relative minimum phase (V = 7.6) observed during a long and comparatively quiet period of intermediate brightness. The spectrum displays prominent P Cygni lines of He I, Si III, N II and Fe III. The corresponding equivalent spectral type is B2-3 Ib. The presence of an outward accelerated envelope with a multiple shell structure is confirmed. The observation of broad [Fe II] emission lines, in contrast with the absence of permitted ones, implies the presence of a low density shell expanding at about 200 km/s. [less ▲]

Premier supplément au catalogue des périodes observées our des étoiles Ap

in Astronomy and Astrophysics. Supplement Series (1988), 72

Supplementary data on the periods of Ap stars with references are presented; 58 new stars are introduced for which periodic variability has been discovered since 1983. For some of these stars periodicity ... [more ▼]

Supplementary data on the periods of Ap stars with references are presented; 58 new stars are introduced for which periodic variability has been discovered since 1983. For some of these stars periodicity was known before 1983 but they were not reported in the previous catalogue. Recently attributed variable star names are also reported. [less ▲]