Astronomy and Astrophysics Supplement Series

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List of Papers (Total 1,649)

Four-colour photometry of eclipsing binaries - XXXIX. Light curves of the pre–main sequence triple system TY Coronae Australis

Complete uvby light curves of the detached Herbig Be eclipsing binary TY Coronae Australis are presented. A total of 1789 photometric measurements in each of the four colours were obtained in 1989 and in 1992-1994. A detailed analysis of the y light curve obtained in 1992-1993 is published separately (Casey et al. 1997). The reflection nebula around the system contributes about...

Calculated oscillator strengths of singly ionized cobalt

Transition probabilities of the spectrum of Co II are calculated using the orthogonal operator description for both the odd and the even energy levels.

Stellar population synthesis diagnostics

A quantitative method is presented to compare observed and synthetic colour-magnitude diagrams (CMDs). The method is based on a merit function for a point in the observed CMD, which has a corresponding point in the simulated CMD within of the error ellipse. The merit function is then combined with the Poisson merit function of the points for which no corresponding point was found...

The art of fitting p-mode spectra - II. Leakage and noise covariance matrices

In Part I we have developed a theory for fitting p-mode Fourier spectra assuming that these spectra have a multi-normal distribution. We showed, using Monte-Carlo simulations, how one can obtain p-mode parameters using "Maximum Likelihood Estimators". In this article, hereafter Part II, we show how to use the theory developed in Part I for fitting real data. We introduce 4 new...

Orbital elements of 9 visual double stars

Orbital elements and ephemerides for 9 visual double stars are given.

Continuous declination system set up by observations of photoelectric astrolabe Mark I In Irkutsk - The first results of international cooperation between CSAO and VS NIIFTRI

The Photoelectric Astrolabe Mark I (PHA I) has been revised with a new combined prism which could work as an almucantar with zenith distance of , to measure continuous declinations at the latitude of Irkutsk, Russia (). The PHA I has been working at the astronomical base of VS NIIFTRI in Irkutsk since Nov. 1995 based on an international cooperation agreement of near 4 years for...

Check on JPL DE405 using modern optical observations

JPL DE405 is compared with optical positions of the outer planets Jupiter to Pluto. Systematic errors in some of the optical observations complicate the interpretation of the residuals between observation and DE405. A common offset in the right ascension of the outer planets suggests a frame–tie problem between DE405 and the ICRF. It is concluded that the overall accuracy of...

Spectral classification of unidentified IRAS sources with

Spectral types of a large number of unidentified IRAS Point Sources with were determined; the majority are faint, oxygen-rich (M-type) or carbon-rich giant stars. The Guide Star Catalog has been used to find the photographic magnitudes of the newly classified IRAS sources with quality-3 flux densities at 12 m in order to determine their Bj -[12] colour index. The dependence of...

The density and shock characteristics of NGC 2818

We report the results of narrow band imaging of the bipolar outflow source NGC 2818 in transitions of [NII], [OIII], [SII], and HI. As a consequence, we are able to assess the overall excitation properties of the shell, and determine that line ratios towards the nebular periphery are anomalous, and characteristic of planar shocks with velocity km s-1. Pre-shock densities are...

Photographic observations of visual double stars

The photographic observations of 72 visual double stars are presented. The observations were made in the years 1992-1997 with the 60-cm double refractor of the Bosscha Observatory at Lembang.

A method to analyze adaptive optics images of binary stars

We present a fast and robust ad-hoc method to analyze a set of short exposure images of a close binary star taken by the adaptive optics system of the ESO 3.6 m telescope. At first each image is fitted, assuming as a radially symmetrical approximation of its "instantaneous” PSF, the superposition of a central Gaussian and of a Moffat torus. Owing to the coral variability and...

Atomic data from the Iron Project - XXXV. Relativistic fine structure oscillator strengths for Fe XXIV and Fe XXV

The first large-scale calculations of relativistic radiative transition probabilities from the Iron Project is reported for dipole allowed and intercombination (E1) transitions in Li-like Fe XXIV and He-like Fe XXV. The ab intio calculations are carried out in the close coupling approximation using the Breit-Pauli R-matrix method in intermediate coupling characterized by SLJ...

A list of nearby dwarf galaxies towards the Local Void in Hercules-Aquila

Based on film copies of the POSS-II we inspected a wide area of □° in the direction of the nearest cosmic void: {RA = 18h 38m, , 1500 km s-1}. As a result we present a list of 78 nearby dwarf galaxy candidates which have angular diameters and a mean surface brightness , mag/□″. Of them 22 are in the direction of the Local Void region. To measure their redshifts, a HI survey of...

Optimised polarimeter configurations for measuring the Stokes parameters of the cosmic microwave background radiation

We present configurations of polarimeters which measure the three Stokes parameters I, Q and U of the Cosmic Microwave Background Radiation with a nearly diagonal error matrix, independent of the global orientation of the polarimeters in the focal plane. These configurations also provide the smallest possible error box volume.

Radial velocities of Hipparcos southern B8-F2 type stars

Radial velocities have been determined for a sample of B8-F2 type stars observed by the Hipparcos satellite. Observations were obtained within the framework of an ESO key-program. Radial velocities have been measured using a cross-correlation method, the templates being a grid of synthetic spectra. The obtained precision depends on effective temperature and projected rotational...

The photographic observations on the components of Sirius

A series of photographic observations on the components of Sirius was carried out in the years 1976-1986 at the Bosscha Observatory. We present the analysis and the results of the measurements.

Stellar kinematic data for the central region of spiral galaxies. II.

We present a second dataset of absorption spectroscopy on the inner region of spiral galaxies. We have determined the central velocity dispersion for 42 Sa-Sc objects and, for 32 of them, stellar rotation curves and velocity-dispersion profiles. Some of these profiles are limited to the bulge, some others do reach a region dominated by the luminosity of the disk. These data are...

3D mapping of optical turbulence using an atmospheric numerical model - II. First results at Cerro Paranal

The first statistical results of simulations of optical turbulence over Cerro Paranal by an atmospheric non-hydrostatic model (Meso-Nh) are presented. Measurements from the whole PARSCA93 campaign are analyzed. Simulations are compared to optical measurements obtained by a Scidar and a DIMM working at the same time during 14 nights 13-26 May 1993 over Paranal (Chile). An...

Spectral analysis of stellar light curves by means of neural networks

Periodicity analysis of unevenly collected data is a relevant issue in several scientific fields. In astrophysics, for example, we have to find the fundamental period of light or radial velocity curves which are unevenly sampled observations of stars. Classical spectral analysis methods are unsatisfactory to solve the problem. In this paper we present a neural network based...

IC 348 proper motion study from digitised Schmidt plates

A new proper motion study for about 1400 stars with  mag in a one square degree region around the young open cluster IC 348 based on Schmidt plates is presented. With an overall accuracy of about 3 mas/yr (2.5 mas/yr, respectively for all stars with  mag) we have obtained membership probabilities dividing our sample into three groups: foreground stars, cluster stars and...

The Hamburg/SAO survey for emission–line galaxies - II. The second list of 128 galaxies

We present the second part of the Hamburg/SAO Survey for Emission-Line Galaxies (HSS therein, SAO – Special Astrophysical Observatory, Russia) which is based on the digitized objective-prism photoplates database of the Hamburg Quasar Survey (HQS). The main goal of the project is the search for emission-line galaxies (ELG) in order to create a new deep sample of blue compact/Hii...

Absolute declinations with the photoelectric astrolabe at Calern Observatory (OCA)

A regular observational programme with a photoelectric astrolabe have been performed at "Observatoire du Calern" (Observatoire de la Côte d'Azur, OCA, ϕ = ; λ = , Calern, Caussols, France) for the last twenty years. It has been almost fully automatized between 1984 and 1987. Since 1988 the photoelectric astrolabe was used without any modification. In addition to determining the...

Colour distributions in E-S0 galaxies - IV. Colour data and dust in E's from Nieto's B, R frames

The colours distributions (with R in Cousins's system) have been measured in 44 E classified galaxies in the Local Supercluster, from pairs of frames collected by Nieto and co-workers in 1989-91. These are nearly all from the CFHT, and of sub-arsec resolution. Great attention has been given to the effects of unequal PSF's in the B and R frames upon colour distributions near...

Elemental abundance studies of CP stars - II. The silicon stars HD 133029 and HD 192913

Fine analyses of the silicon stars HD 133029 and HD 192913 are presented using ATLAS9 model atmospheres whose predictions fit the optical region spectrophotometry and Hγ profiles and have the same bulk metallicity as the deduced abundances. Both are very He poor stars. The light elements are mostly solar except for silicon, and all the heavier elements, except nickel in HD 133029...

Photometric studies of some starburst galaxies

We present the results of a detailed morphological analysis of ten starburst galaxies selected from the Markarian catalog of uv-excess objects. CCD surface photometry of these galaxies was carried out based on observations made in B, V (Johnson) and R, I (Kron-Cousins) band passes. We present the radial variations of surface brightness, ellipticity, position angle and the colour...