Astronomy and Astrophysics Supplement Series

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List of Papers (Total 2,129)

Photometric study of the close binary system DD Monocerotis

New BV light curves of the short-period eclipsing binary system DD Mon have been obtained. Light-curve variability is seen in both B and V bands as compared with the light curves obtained in 1986 by Yamasaki et al. (1990). The light curves are analyzed by using Wilson-Devinney's synthetic light-curve program, and the present photometric solution reveals that DD Mon is a near...

photometric sequences for nine selected dark globules

Using a CCD detector, BVRI photometry has been carried out in the vicinity of nine Lynds dark nebulae. In conjunction with spectroscopic data which could be obtained at a later stage, the data listed herein could be used for possible distance determinations of the nine nebulae.

Spatial distribution of neutral and ionic constituents in comet P/Halley

Multislit spectra of comet P/Halley were obtained on April 10, 1986, using a focal reducer with a field of angular diameter. The number and arrangement of the slits allowed a reconstruction of the spatial distribution of principal neutral and ionic coma constituents within a frame of about at the comet. Radial profiles and two-dimensional maps for the dust continuum, CN, , CH...

A list of new nearby dwarf galaxy candidates

To increase completeness of the distance limited sample of nearby galaxies from the the Kraan-Korteweg & Tammann (1979) catalogue we undertook a search for small companions of larger known galaxies which have corrected radial velocities within 500 km/s. Based primarely on the POSS-II and ESO/SERC films we found 260 nearby dwarf galaxy candidates with angular diameters  arcmin...

Radiation pressure on non-spherical dust grains in envelopes of late-type giants

Stellar winds are typical features of the AGB evolution. They are formed as the result of the radiation pressure on dust grains. We calculate the radiation pressure force of a red giant acting on prolate and oblate spheroidal grains of different size, aspect ratio and chemical composition. The exact solution to the light scattering problem for spheroids is used. The force and the...

The revised GB/GB2 sample of extragalactic radio sources

This paper presents the revised sample of 373 extragalactic radio sources brighter than 0.2 Jy at 1.4 GHz. These sources, selected from the finding Green Bank surveys, were mapped at 1465 MHz using the VLA at different configurations. The biases introduced into the original GB and GB2 catalogues by confusion as well as partial resolution by the VLA at A-configuration, are...

Four colour photometry of binary systems - III. The early-type binary system CR Cassiopeiae

This paper presents new uvby light curves of the detached eclipsing binary CR Cas together with some measurements. From the analysis of the photometry we have estimated preliminary values for interstellar reddening and distance, radiative parameters of both components and an approximation to the geometrical elements of the system. The intrinsic photometric indices are compatible...

Hipparcos photometry of 24 variable massive stars (α Cygni variables)

The photometric variability of 24 α Cyg variables, i.e. variable super–and hypergiants, observed by the Hipparcos satellite is described. Three of the selected stars are situated in the SMC, 12 in the LMC and the remaining 9 in the Galactic plane. Four of them are hot S Dor–type variables, or LBVs (luminous blue variables) and two are possible members of this class. Light curves...

A photometric catalogue of galaxies in the cluster Abell 85

We present two catalogues of galaxies in the direction of the rich cluster ABCD 85. The first one includes 4232 galaxies located in a region from the cluster centre. It has been obtained from a list of more than 25000 galaxy candidates detected by scanning a Schmidt photographic plate taken in the BJ band. Positions are very accurate in this catalogue but magnitudes are not. This...

Achromatic lens systems for near infrared instruments - II. Performances and limitations of standard Flint glasses

This paper investigates which normal Flint glasses are best suited for the design of lens systems working in the infrared up to about 1.7 μm, and possibly up to 2.5 μm. Between 0.9 and 2.5 μm the best known achromatic pairs are -2 and -3 and, to a lesser extent, -7 (Oliva & Gennari 1995). Unfortunately, Schott will most probably stop the production of these very little used and...

A deep λ20 cm radio continuum survey of M 31

We present a survey of the total and linearly polarized radio continuum emission of the Andromeda galaxy at 20 cm wavelength with the VLA-D array. 7 fields were observed with 45 angular resolution. The missing large-scale total emission observed with the Effelsberg telescope was inserted. This survey is the most sensitive radio continuum survey of M 31 so far and the first one in...

Structure and stellar content of dwarf galaxies - I. B and R photometry of dwarf galaxies in the M 81 group

We have carried out CCD photometry in the Cousins B and R bands of 25 dwarf galaxy members and suspected members of the M 81 group of galaxies. Based on azimuthally averaged brightness profiles we have derived total magnitudes, effective radii, effective surface brightnesses, as well as galaxy diameters at various isophotal levels in both photometric bands. Best-fitting...

Long-term visual spectrophotometric behaviour of Be stars

The long-term spectrophotometric variations of 49 Be stars are studied using the U and V magnitudes of the UBV system, the total Balmer discontinuity D and the visible gradient . BCD spectrophotometric and photometric data in five different photometric systems, obtained in most cases since 1950 and reduced to the BCD system, were used. The (), (), () and () correlations obtained...

Near-infrared images of star forming regions containing masers - Las Campanas observations of 31 southern sources

We present sensitive high resolution near infrared (NIR) broad band (J, H, and K) observations of a sample of 31 Star Forming Regions (SFRs) which contain H2O and OH maser sources. The observations are aimed at the detection and characterization of Young Stellar Objects (YSOs) which may be the source of excitation of the maser emission. In spite of the large number of sources...

Micrometer measurements of double stars from the Spanish observatories at Calar Alto and Santiago de Compostela

This paper reports 458 micrometer observations of visual double stars made with the 152 cm. telescope at Calar Alto Observatory (Almería, Spain) and with the 35 cm. telescope at Ramón María Aller Observatory (Santiago de Compostela, Spain).

Loose groups of galaxies in the Perseus–Pisces survey

We present a large catalog of loose groups of galaxies in the Southern Galactic Hemisphere, selected from the Perseus–Pisces redshift Survey (PPS). Particular care is taken in order to obtain group samples as homogeneous as possible to previously published catalogs. All our catalogs contain about 200 groups, significantly more than in most previous studies where group samples...

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...

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...