Astronomy and Astrophysics Supplement Series

https://aas.aanda.org/

List of Papers (Total 1,649)

Analysis of CMB maps with 2D wavelets

We consider the 2D wavelet transform with two scales to study sky maps of temperature anisotropies in the cosmic microwave background radiation (CMB). We apply this technique to simulated maps of small sky patches of size and pixels. The relation to the standard approach, based on the , is established through the introduction of the scalogram. We consider temperature fluctuations...

A photometric catalogue of galaxies in the cluster Abell 496

We present two catalogues of galaxies in the direction of the rich cluster Abell 496 . The first one includes 3879 galaxies located in a region of roughly ± 1.3° from the cluster centre. It has been obtained from a list of more than 35000 galaxy candidates detected by scanning part of a Schmidt photographic plate taken in the bJ band. Positions are very accurate in this catalogue...

The Asiago Supernova Catalogue - 10 years after

Ten years after the publication of the previous release, we present a new edition of the Asiago Supernova Catalogue updated to December 31, 1998 and containing data for 1447 supernovae and their parent galaxies. In addition to the list of the data for a large number of new SNe, we made an effort to search the literature for new information on past SNe as well. We also tried to...

A catalogue of velocities in the direction of the cluster of galaxies Abell 496

We present a catalogue of velocities for 466 galaxies in the direction of the cluster Abell 496, in a region covering about ( Mpc for an average redshift for Abell 496 of 0.0331, assuming H0 = 50 km s-1 Mpc-1). This catalogue includes previously published redshifts by [Proust et al. (1987)], [Quintana & Ramírez (1990)] and [Malumuth et al. (1992)], redshifts from the CfA redshift...

A catalog of rotational and radial velocities for evolved stars

Rotational and radial velocities have been measured for about 2000 evolved stars of luminosity classes IV, III, II and Ib covering the spectral region F, G and K. The survey was carried out with the CORAVEL spectrometer. The precision for the radial velocities is better than 0.30 km s-1, whereas for the rotational velocity measurements the uncertainties are typically 1.0 km s-1...

Galaxy coordinates - II. Accurate equatorial coordinates for 17298 galaxies

Using images of the Digitized Sky Survey we measured coodinates for 17298 galaxies having poorly defined coordinates. As a control, we measured with the same method 1522 galaxies having accurate coordinates. The comparison with our own measurements shows that the accuracy of the method is about 6 arcsec on each axis (RA and DEC).

Period–Luminosity–Colour distribution and classification of Galactic oxygen–rich LPVs - I. Luminosity calibrations

The absolute K magnitudes and kinematic parameters of about 350 oxygen–rich Long–Period Variable stars are calibrated, by means of an up–to–date maxi mum–likelihood method, using Hipparcos parallaxes and proper motions together with radial velocities and, as additional data, periods and colour indices. Four groups, differing by their kinematics and mean magnitudes, are found. For...

Near-infrared photometry of isolated spirals with and without an AGN - I. The data

We present infrared imaging data in the J and bands obtained for 18 active spiral galaxies, together with 11 non active galaxies taken as a control sample. All of them were chosen to satisfy well defined isolation criteria so that the observed properties are not related to gravitational interaction. For each object we give: the image in the band, the sharp-divided image (obtained...

CCD astrometry of faint compact extragalactic radio sources - I. First results and description of the program

Optical positions relative to the Hipparcos Catalogue (ESA 1997) have been obtained for the optical counterparts of 15 faint () southern compact extragalactic radio sources (CERS). Most of these sources are not adequately observable (or simply not visible) by means of direct photography with a conventional wide-field telescope, so the positions were determined using a multi-step...

A ROSAT PSPC catalogue of X-ray sources in the LMC region

We analyzed more than 200 ROSAT PSPC observations in a 10 by 10 degree field centered on the Large Magellanic Cloud (LMC) and performed between 1990 and 1994 to derive a catalogue of X-ray sources. The list contains 758 sources with their X-ray properties. From cross-correlations of the PSPC catalogue with the SIMBAD data base and literature searches we give likely...

Photometry and position observations of Saturnian satellites during their mutual eclipses and occultations in 1995 performed at the Observatories in Russia and Kazakhstan

Photometry of mutual eclipses and occultations of planetary satellites is a powerful technique to explore these bodies. Observations of these rare events are a source of much precise information. In 1995 the Celestial Mechanics Department of the Sternberg Astronomical Institute (SAI) has organized the observations of mutual eclipses and occultations of Saturnian satellites on a...

New high proper motion stars with declinations between and , and right ascensions between 13h 30m and 24h

Proper motions, positions, finding charts and magnitudes are given for 293 newly discovered stars with proper motions larger than 0.15 arcsec/year. They are located between and in declination, and 13h 30m and 24h in right ascension. Their blue photographic magnitudes range from approximately 13.0 to 18.5. Six stars of the above sample have proper motions larger than 0.4 (0.401 to...

DIAGONAL: A numerical solution of the Stokes transfer equation

In a previous paper (Semel & López Ariste 1999, hereafter referred to as Paper I) the authors found a new solution for the integration of the radiative transfer equation for polarized light (RTE). The present paper is a continuation of that work, and shows how this solution has been incorporated into a new numerical code for the integration of the RTE. This code, called DIAGONAL...

Young massive star clusters in nearby galaxies - II. Software tools, data reductions and cluster sizes

A detailed description is given of the data analysis leading to the discovery of young massive star clusters (YMCs) in a sample of 21 nearby galaxies. A new useful tool, ishape, for the derivation of intrinsic shape parameters of compact objects is presented, and some test results are shown. Completeness tests for the cluster samples are discussed, and ishape is used to estimate...

Polarimetric imaging of large fields in radio astronomy

We introduce and compare schemes to form wide-field polarimetric images from radio-interferometric mosaic and single-dish observations. We concentrate on two schemes based on maximum entropy principles. One scheme deconvolves the four Stokes parameters jointly (simultaneously), the other deconvolves each Stokes parameter separately. We find that the two schemes do not produce...

Stark broadening of the lower Rydberg , and lines of atomic hydrogen

This paper deals with the calculation of line widths and lineshapes of the lower Rydberg lines of atomic hydrogen () in the conditions of stellar envelopes and atmospheres - electron densities scaling from 109 to 1016 cm-3 and temperatures varying between 5000 and 40000 K. For these lines, the traditional semi-classical method breaks down, especially at low densities. Another or...

Survey of bipolar outflows and methanol masers in the C32S ( and C34S (2-1) lines in the Northern sky

A survey of 158 sources (bipolar outflows and methanol masers) was carried out in the CS(2-1) and C34S(2-1) lines to measure and compare densities in a large number of bipolar outflows and in Class I and Class II methanol masers, both associated with and unrelated to bipolar outflows. The statistical characteristics of the regions, forming Class I methanol masers differ from...

Rate coefficients for electron impact excitation of S xv

Collision strengths for electron impact excitation of S xv are calculated in a close-coupling approach. The nineteen lowest LS states are included in the calculation. Rate coefficients are obtained for transitions from the ground 1s2 1S0 state to the fine-structure levels of all excited states of 1s2 () and 1s3 () configurations. The resulting effective collision strengths are...

Line identifications and intensities for the optical spectrum of RR Telescopii between 3180 and 9455 Å

The symbiotic nova RR Telescopii has been observed with the 3.9 m telescope at the Anglo-Australian Observatory (AAO), using the University College London Echelle Spectrograph (UCLES) in conjunction with a Tek CCD. It displays a rich emission line spectrum, ranging in excitation from NI to [NiVIII]. We present a list of 811 measured lines, with their suggested identifications and...

U B V absolute CCD photometry and differential astrometry of a sample of visual double stars with A-type primaries

We present V magnitudes, and colours of the components of 111 visual double stars and their relative position measurements ρ and θ. The primaries are of spectral class A; the angular separation is in the range. The observations were made at the 61-cm reflector of University of Toronto Southern Observatory, Chile. The obtained photometric results are of a moderate quality for...

Metallicity calibration of a DDO CN index and other low-resolution indices for G and K stars

Metallicity calibrations of low-resolution parameters are potentially useful for (at least) two problems: the properties of moving groups, and the supermetallicity problem in K giants. In this paper, metallicity calibrations are derived for six sets of parameters. One of these parameters is the DDO CN index δCN. This parameter and three others are calibrated for use with evolved...

Photometry and position observations of Saturnian satellites during their mutual eclipses and occultations in 1995 performed at the Observatories in Russia and Kazakhstan

Photometry of mutual eclipses and occultations of planetary satellites is a powerful technique to explore these bodies. Observations of these rare events are a source of much precise information. In 1995 the Celestial Mechanics Department of the Sternberg Astronomical Institute (SAI) has organized the observations of mutual eclipses and occultations of Saturnian satellites on a...

HI observations of blue compact galaxies from the first and second Byurakan surveys

We present the results of a neutral hydrogen survey of 79 galaxies from a statistical sample of 88 Blue Compact Galaxies (BCGs) selected from the First and Second Byurakan objective prism surveys to have a HII region-like spectrum, an equivalent width of the [O III] line larger than , and a velocity  km s-1. The detection rate for the statistical sample is 74%. HI masses range...

Polarimetric imaging of large fields in radio astronomy

We introduce and compare schemes to form wide-field polarimetric images from radio-interferometric mosaic and single-dish observations. We concentrate on two schemes based on maximum entropy principles. One scheme deconvolves the four Stokes parameters jointly (simultaneously), the other deconvolves each Stokes parameter separately. We find that the two schemes do not produce...

Multi-frequency study of the B3-VLA sample - II. The database

We present total flux densities of 1049 radio sources in the frequency range from 151 MHz to 10.6 GHz. These sources belong to the B3-VLA sample, which is complete down to 100 mJy at 408 MHz. The data constitute a homogeneous spectral database for a large sample of radio sources, 50 times fainter than the 3C catalogue, and will be used to perform a spectral ageing analysis, which...