Astronomy and Astrophysics Supplement Series

https://aas.aanda.org/

List of Papers (Total 2,129)

TeV gamma-ray emission from gamma-ray bursts and ultra high energy cosmic rays

Some recent experiments detecting very high energy (VHE) gamma-rays above 10-20 TeV, independently reported VHE bursts for some bright gamma-ray bursts (GRBs), although further confirmation is necessary. If these signals are truly from GRBs, these GRBs must emit a much larger amount of energy as VHE gamma-rays than in the ordinary photon energy range of GRBs (keV-MeV). We show...

The stellar content and distance to the nearby blue compact dwarf galaxy NGC 6789

In this paper we present the results of a detailed B, V, R, I, and Hα study of the isolated nearby blue compact dwarf (BCD) galaxy NGC 6789. The observed galaxy has not yet been resolved into stars up to now. On CCD frames obtained with 6 m BTA telescope and 2.5 m Nordic telescope the galaxy is well resolved. Its colour-magnitude diagram confirms the two component (core-halo...

Rovibrational excitation of HD molecules by He atoms

Rate coefficients for rovibrational transitions induced in HD by collisions with He are presented. Full quantum mechanical treatment has been used with the interaction potential surface calculated by Muchnick & Russek (1994). The vibrational 0 quenching rates of HD due to various perturbers are compared up to temperatures of 1500 K. The influence of vibrationally excited channels...

Spectral classification systems and photometry needed in calculations for atmospheric refraction

In ground-based measurements of exact positions of celestial objects on the sky the astronomical atmospheric refraction should be taken into account. In our calculations for refraction we use the Stone code (Stone 1996) where the mean refraction is computed by integrating numerically across the passband with Simpson's Rule. The code has been modified for the case of the 10″ LX200...

Search for a possible space-time correlation between high energy neutrinos and gamma-ray bursts

We look for space-time correlations between 2233 gamma-bursts in the Batse Catalogs and 894 upward-going muons produced by neutrino interactions in the rock below or inside MACRO. Considering a search cone of around GRB directions and a time window of s we find 0 events to be compared to 0.035 expected background events due to atmospheric neutrinos. The corresponding upper limit...

Surface photometry of radio loud elliptical galaxies from the B2 sample

V-band CCD imaging is presented for 72 galaxies from the B2 radio sample (Colla et al. 1975; Fanti et al. 1978), with redshifts up to 0.2 and radio powers W Hz-1. According to the morphology on the optical images 57 galaxies are classified as ellipticals, 6 as spirals and 7 as irregular. Surface photometry of the sample of ellipticals was obtained fitting ellipses to the light...

The Hamburg/SAO survey for emission–line galaxies - III. The third list of 81 galaxies

We present the third list with results of the Hamburg/SAO Survey for Emission-Line Galaxies (HSS therein, SAO – Special Astrophysical Observatory, Russia). This survey is based on the digitized objective-prism photoplate database of the Hamburg Quasar Survey (HQS). 
Here, we present new spectroscopic results of candidates which were obtained in 1998 with the 2.1 m KPNO and the 2...

Catalogue général de vitesses radiales moyennes pour les étoiles galactiques - Mean radial velocities catalog of galactic stars

We present a catalogue of mean radial velocities for Galactic stars which supplements the catalogue WEB (Duflot et al. 1995) with observations published through december 1990. The catalogue contains new mean velocities for 20574 stars. Only observations obtained with adequate spectral resolution and standardized to the IAU or Wilson (1953) velocity systems have been used. Entries...

A λ2 mm molecular line survey of the C-star envelope IRC+10216

The mm-wave spectrum of the C-star envelope IRC+10216 has been continuously surveyed between 129.0 and 172.5 GHz with the IRAM 30-m telescope. 380 lines are detected, of which 317 have been identified. The identified lines arise from 30 different molecules and radicals which, in their vast majority, are not observed in hot and dense interstellar clouds such as Orion A or W3(OH...

X-ray and optical observations of three clusters of galaxies: Abell 901, Abell 1437, and Abell 3570

We analyse three clusters of galaxies, Abell 901 (), Abell 1437 () and Abell 3570 (). They have low to intermediate X-ray fluxes and an irregular morphology in the ROSAT All-Sky Survey (RASS). These clusters are chosen to test the abilities and limitations of the RASS in terms of cluster fluxes and cluster morphologies. Therefore some “worst” cases are used here. X-ray...

A λ2 mm molecular line survey of the C-star envelope IRC+10216

The mm-wave spectrum of the C-star envelope IRC+10216 has been continuously surveyed between 129.0 and 172.5 GHz with the IRAM 30-m telescope. 380 lines are detected, of which 317 have been identified. The identified lines arise from 30 different molecules and radicals which, in their vast majority, are not observed in hot and dense interstellar clouds such as Orion A or W3(OH...

Photometric distances to six bright resolved galaxies

We present photometry of the brightest stars in six nearby spiral and irregular galaxies with corrected radial velocities from 340 to 460 km s-1. Three of them are resolved into stars for the first time. Based on luminosity of the brightest blue stars we estimate the following distances to the galaxies: 5.0 Mpc for NGC 784, 9.2 Mpc for NGC 2683, 8.9 Mpc for NGC 2903, 4.1 Mpc for...

The Hamburg/SAO survey for emission–line galaxies - III. The third list of 81 galaxies

We present the third list with results of the Hamburg/SAO Survey for Emission-Line Galaxies (HSS therein, SAO – Special Astrophysical Observatory, Russia). This survey is based on the digitized objective-prism photoplate database of the Hamburg Quasar Survey (HQS). 
Here, we present new spectroscopic results of candidates which were obtained in 1998 with the 2.1 m KPNO and the 2...

Spectral classification of O–M stars on the basis of UBV photometry

A new technique allowing the Q-method to be used surely for both the spectral classification of young O–A0 stars and older spectral subclasses A1–M5 is described. Characteristics of interstellar light absorption dependence on distance in the given direction of the sky is used as a main criterion for excluding possible multiplicity of star spectral estimates at some constant...

Kinematics and CMD of the globular cluster NGC 4147

Astrometry and BVRI CCD photometry of 115 stars down to in the region of about around the globular cluster NGC 4147 was performed. In the astrometric reduction, three earlier epoch plates taken at Sheshan, Shanghai, China, in 1958 and four recent epoch B-passband CCD frames taken at Kavalur, India, were used. The data were reduced to a catalogue based on measurements of stars on...

Automatic extraction and classification of low-dispersion objective prism stellar spectra

The observing material used for this task is prism spectral plates taken with Schmidt-class telescopes. Such a plate generally contains thousands of spectra, and there are prism-plate libraries and digitized databases in several astronomical centers that can be exploited for this analysis. After a successive detection from the prism plate image, the spectra are automaticaly...

Optical polarization of 47 quasi-stellar objects: The data

New broad-band linear polarization measurements are presented for a sample of 47 QSOs which includes 27 broad absorption line QSOs and 2 gravitational lens candidates.

Spectral classification of O–M stars on the basis of UBV photometry

A new technique allowing the Q-method to be used surely for both the spectral classification of young O–A0 stars and older spectral subclasses A1–M5 is described. Characteristics of interstellar light absorption dependence on distance in the given direction of the sky is used as a main criterion for excluding possible multiplicity of star spectral estimates at some constant...

1.65 μm (H-band) surface photometry of galaxies - III. observations of 558 galaxies with the TIRGO 1.5 m telescope

We present near-infrared H-band (1.65 μm) surface photometry of 558 galaxies in the Coma Supercluster and in the Virgo cluster. This data set, obtained with the Arcetri NICMOS3 camera ARNICA mounted on the Gornergrat Infrared Telescope, is aimed at complementing, with observations of mostly early-type objects, our NIR survey of spiral galaxies in these regions, presented in...

Parallelized tree–code for clusters of personal computers

We present a tree–code for integrating the equations of the motion of collisionless systems, which has been fully parallelized and adapted to run in several PC–based processors simultaneously, using the well–known PVM message passing library software. SPH algorithms, not yet included, may be easily incorporated to the code. The code is written in ANSI C; it can be freely...

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

We present a catalogue of 517 discrete X-ray sources in a field covering the Small Magellanic Cloud (SMC). The catalogue was derived from the pointed ROSAT PSPC observations performed between October 1991 and May 1994 and is complementary to the Large Magellanic Cloud (LMC) catalogue published by Haberl & Pietsch (1999). We followed the same identification scheme and used, among...

A comprehensive study of the δ Scuti star, 57 Tauri (=  HR 1351) in the Hyades cluster

A comprehensive frequency analysis of 57 Tau, supposed only a static pulsational arrangement, is presented based on 54 nights of photometric data collected between 1981 and 1995 (althogether 232 hours). The presence of individual frequencies is confirmed by intercomparing four subsets of this data set, however, the uncertainties in data coming from the sparse nights and low...

The ROSAT point spread functions and associates

The ROSAT point spread functions for the instruments XRT-PSPC, XRT-HRI, (XUV telescope)-WFC in pointing mode as well as the ROSAT survey point spread functions are documented. A series of plots exhibits the point spread function models. Commands dedicated and calibration tables related to point spread functions are explained. The internet addresses for the accompanying...

The U.S. Naval Observatory pole-to-pole catalog: W2

Between the years 1985 and 1996 the U.S. Naval Observatory (USNO), using two transit circles, one located in Washington, DC (U.S.A.) and the other in Blenheim, New Zealand, conducted an ambitious program of absolute observations of positions of celestial objects completely covering both hemispheres. Over 737 000 individual observations were made, primarily of the International...

A neutral hydrogen survey of polar ring galaxies - III.  observations and comparison with published data

A total of 50 optically selected polar ring galaxies, polar ring galaxy candidates and related objects were observed in the 21-cm  line with the  decimetric radio telescope and 31 were detected. The objects, selected by their optical morphology, are all north of declination -39, and generally relatively nearby (V < 8000 ) and/or bright ( 15.5). The  line data are presented for...