Astronomy and Astrophysics Supplement Series

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List of Papers (Total 1,079)

CCD astrometry and UBV photometry of visual binaries - II. Visual double stars with mainly G - type primaries and relatively small angular separation

Differences of magnitude and and colours, as well as separations and position angles of 42 relatively close double stars are presented. The selection criteria of our sample are: the relatively small separation (between 2.5 and 5 arcseconds), magnitude difference under 1.25 mag, and mainly G-type primaries. The CCD observations, performed at the 90 cm Dutch telescope at ESO, were...

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...

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...

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...

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.

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...

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...

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...

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...

The effective temperature scale of giant stars (F0–K5) - I. The effective temperature determination by means of the IRFM

We have applied the InfraRed Flux Method (IRFM) to a sample of approximately 500 giant stars in order to derive their effective temperatures with an internal mean accuracy of about 1.5% and a maximum uncertainty in the zero point of the order of 0.9%. For the application of the IRFM, we have used a homogeneous grid of theoretical model atmosphere flux distributions developed by...

A survey of flares and current helicity in active regions

We examine the spatial and temporal relationship between chromospheric H flares and photospheric current helicities in active regions. All of the data were obtained by the vector magnetograph system at Huairou Solar Observing Station of Beijing Astronomical Observatory. We focus our analysis on NOAA Active Region 6233, which was observed on 30 August 1990. The result shows that...

Strömgren photometry of 40 Harmonia, 45 Eugenia and 52 Europa

The Asteroids 40 Harmonia, 45 Eugenia and 52 Europa have been studied photometrically. From their lightcurves synodic periods of , and , and maximum amplitudes of , and , have been deduced for 40 Harmonia, 45 Eugenia and 52 Europa, respectively. Improved solutions for the sense of rotation, sidereal period, pole orientation and shape properties are proposed.

Six years of short-spaced monitoring of the and , 28SiO maser emission in evolved stars

We present the results from a monitoring of the and , 28SiO maser emission in 21 objects, covering all types of known SiO maser emitters: 13 Mira variables, 2 long period semi regu lars (SRGs), 3 variable super giants (SGs), 2 OH/IR stars, and one young stellar object. This study has been carried out with the 13.7 meter radiotelescope of the Centro Astronómico de Yebes...

Starspot photometry with robotic telescopes. and by light curves of 47 active stars in 1996/97

We present continuous multicolor photometry for 47 stars from October 1996 through June 1997. Altogether, 7073 , UBV, and by data points, each the average of three individual readings, were acquired with three automatic photoelectric telescopes (APTs) at Fairborn Observatory in southern Arizona. Most of our targets are chromospherically active single and binary stars of spectral...

The luminosity function of cluster galaxies - II. Data reduction procedures applied to the cluster Abell 496

We initiated a large project aimed to estimate the Luminosity Function of galaxies in clusters and to evaluate its relation to cluster morphology. With this paper we deem necessary to outline the general procedures of the data reduction and details of the data analysis. The cluster sample includes the brightest southern ROSAT all-sky survey clusters with . These have been...