Astronomy and Astrophysics Supplement Series

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List of Papers (Total 2,129)

Near-infrared surface photometry of early-type spiral galaxies - I. Bulge and disk decomposition

We present near-infrared (NIR) surface photometry of a sample of 14 early-type spirals with observed rotation curves. In this first paper, we report the results of two-dimensional parametric and non-parametric decompositions to separate the bulge and disk components; the parametric bulge is modeled with a generalized exponential law of integer index n, and the disk with a simple...

A 12CO () and () atlas of circumstellar envelopes of AGB and post-AGB stars

We present the results of a 12CO () and () survey on a sample of 46 objects classified as AGB and post-AGB stars. We have obtained fully sampled high resolution maps of their 12CO () emission by combining visibilities from the IRAM interferometer with short spacing observations from the IRAM 30 m telescope. Properties of their circumstellar envelopes like fluxes, radii, and...

A radio continuum study of the Magellanic Clouds - VII. Discrete radio sources in the Magellanic Clouds

We present a study of discrete radio sources in the Magellanic Clouds (MCs) using the latest large-scale radio surveys made with the Parkes radio telescope between 1.4 and 8.55 GHz. These surveys achieved higher sensitivity then previous surveys done with the Parkes telescope and so the number of discrete radio sources detected towards the MCs has increased by factor of five...

Contribution à l'étude de la binarité des étoiles de type Am - I. HD 125273, binaire spectroscopique à raies doubles HD 125273, a double-lined spectroscopic binary

We present an observing program undertaken at Observatoire de Haute-Provence, for the search and study of spectroscopic binaries among Am stars. HD 125273 was recognized as an Am star some time ago (Olsen 1980; Abt 1984); observations, carried out with the CORAVEL spectrovelocimeter, show that this star is a double-lined spectroscopic binary; its orbital elements are as follows...

Results of the digital co-addition of thirteen Schmidt films of the Virgo cluster of galaxies

We have digitally co-added APM scans of 13 Kodak TechPan films of the SE region of the Virgo cluster of galaxies. The field of the R-band films combined with the resolution of arcsec pixel-1 results in data file sizes of about 222 MBytes. The 13 scanned films have been aligned, co-added, corrected for vignetting effects and cleaned of stellar features. To illustrate the...

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...

A search for clustering around Herbig Ae/Be stars - II. Atlas of the observed sources

We present large field infrared images of a sample of 45 Herbig Ae/Be stars. Stellar parameters, such as age and luminosity, have been derived for all of them in a consistent way. The images have been used to identify stellar groups or clusters associated with the Herbig Ae/Be star. The results presented in this paper form the database for a study of clustering around...

Long-term spectroscopy of η Carinae - I. The high and low excitation phases

Quantitative measurements of line parameters in the spectrum of η Carinae are presented for both the broad and narrow line components. A total of 655 spectral features were measured in the spectral range 3850 Å to 11000 Å, giving a comprehensive view of the behavior of atomic transitions ranging from a few to tens of electron volts. The spectrum on the phase of maximum intensity...

AGAPEROS: Searching for microlensing in the LMC with the pixel method - I. Data treatment and pixel light curves production

Recent surveys monitoring millions of light curves of resolved stars in the LMC have discovered several microlensing events. Unresolved stars could however significantly contribute to the microlensing rate towards the LMC. Monitoring pixels, as opposed to individual stars, should be able to detect stellar variability as a variation of the pixel flux. We present a first...

Global properties of the population of Hii regions in NGC 7479 from photometric Hα imaging

We present a new high quality continuum-subtracted Hα image of NGC 7479. Using a novel semi-automated technique we have determined the positions, angular sizes, and absolute fluxes of over 1000 Hii regions and have constructed the luminosi ty function for the regions over the whole galaxy, showing that its slope is within the published range for spirals of the same morphological...

Planetary nebulae in M 32 and the bulge of M 31: Line intensities and oxygen abundances

We present spectroscopy of planetary nebulae in M 32 and in the bulge of M 31 that we obtained with the MOS spectrograph at the Canada-France-Hawaii Telescope. Our sample includes 30 planetary nebulae in M 31 and 9 planetary nebulae in M 32. We also observed one HII region in the disk of M 31. We detected [OIII]λ4363 in 18 of the planetary nebulae, 4 in M 32 and 14 in the bulge...

Look-alike galaxies: - HI observations for look-alike galaxies of four calibrators

We present a programme aiming at applying the Tully-Fisher relation for galaxies with the same morphological type and the same inclination (look-alike galaxies or sosie galaxies) as calibrating galaxies. The advantage of sosie galaxies is discussed. In particular, it is shown that using sosies of bright calibrators will allow us to explore the universe deeper and more efficiently...

Autoguider locked on a fiber input for precision stellar radial velocities

Measurement of stellar radial velocities (RV) is one acknowledged approach for planetary-search and asteroseismology programs. We study the incomplete scrambling action of a fiber feeding a spectrograph, which leaves RV errors at a level of few m/s. Observations realised with the ELODIE fiber-fed crossed-dispersion spectrograph at the 193-cm telescope of Observatoire de Haute...

An atlas of images of Planetary Nebulae

A catalogue of narrowband CCD images of 100 southern and 1 northern Planetary Nebulae is presented. The data are images taken in the light of the Hα, Hβ, [OIII]500.7 nm, and [NII]658.4 nm lines. For each image we give the exposure time, the maximum extent of the nebula, and the seeing measured from the frames themselves. For ease of reference, we have added an alphabetical list...

uvby photometry of the mCP stars HD 35298, 19 Lyrae, HD 192678, and HR 8216

Differential Strömgren uvby observations from the Four College Automated Photoelectric Telescope are presented for the mCP stars HD 35298, 19 Lyr, HD 192678, and HR 8216. The period for HD 35298 of 1.85457 days is a revision of North's value while that for 19 Lyr of 7.0980 days is alias of that found by Winzer. HD 192678 is found to be a small amplitude photometric variable with...

B[e] stars - VIII. MWC 342

On the basis of spectroscopic CCD material obtained at the Haute Provence Observatory, we provide line identifications and equivalent width measurements in the wavelength region 4095-8935 Å  of the spectrum of MWC 342. Two hundred eighty emission features are identified and eighteen absorption features. Nine interstellar bands could be identified. Some of the remaining absorption...

The central black hole masses and Doppler factors of the γ-ray loud blazars

In this paper, the central black hole masses and the Doppler factors are derived for PKS 0528+134, PKS 0537-441, 3C 279, PKS 1406-074, PKS 1622-297, Q1633+382, Mkn 501, and BL Lacertae. The masses obtained are in the range of () and compared with that obtained with the Klein-Nishina cross section considered (Dermer & Gehrels 1995). If we considered only the Thomson cross section...

uvby photometry of the magnetic CP stars 45 Leonis, HR 4330, 49 Herculis, and HR 6718

Differential Strömgren uvby photometric observations from the Four College Automated Photoelectric Telescope are presented for the magnetic CP stars 45 Leo, HR 4330, 49 Her, and HR 6718. We refined Winzer's periods for 45 Leo and HR 6718 to 1.443820 days and 0.51899 days, respectively. For HR 4330 our period of 3.516 days is quite different from that of Winzer. That for 49 Her, 0...

The 3-D structure of the Coma–A 1367 supercluster: Optical spectroscopy of 102 galaxies

Optical spectroscopy of 117 CGCG galaxies, 102 of which are projected in the direction of the Coma–A 1367 supercluster, is reported. These new measurements, added to those found in the literature, bring to 1068 the number of CGCG galaxies in this region with available redshift, out of a total of 1085 objects with . We use these data to infer the 3-D structure of the Coma...

H I -rich dwarf galaxies in the Hydra I cluster - I. Photometric and H I data

We present H I, optical and near-infrared photometric data of a sample of H I–selected dwarf galaxy candidates in the Hydra I cluster. This database has been compiled in order to study environmental effects on dwarf galaxies in clusters, in particular the role of interactions between them and either the intracluster-medium or companion galaxies, hitherto studied mainly in massive...

Construction of the Tycho Reference Catalogue

The Tycho Reference Catalogue (TRC) project, as proposed in 1992 by the present authors, aimed to extend the Hipparcos reference system to fainter magnitudes. To assure rigidity of the reference system realization, the project relied on the Tycho Cataloguethat provides highly-accurate positions of more than one million stars on the Hipparcos system. To maintain the precision of...

Star formation in the Vela Molecular Clouds - III. Near IR images and mm photometry of D-cloud IRAS sources

We present the first results of a sensitive ( 17 mag) near IR (JHK) imaging survey of a complete IRAS selected sample of Young Stellar Objects (YSO's) belonging to a Giant Molecular Cloud (GMC) located in the Vela Molecular Ridge (VMR). We provide accurate position and photometry for more than 1300 sources, along with the identification of possible NIR counterparts of the IRAS...

1994-1996 CCD astrometric observations of Saturn's satellites and comparison with theories

In this paper, we publish 451 measurements of positions of the major satellites of Saturn made in 1994, 1995 and 1996 using a CCD detector attached to the 1.56 m reflector at the Sheshan Station near Shanghai. The observations we have made include the seven major satellites exclusive of the outermost satellite Iapetus. In our implementation the four contemporary theories were...

Understanding A-type supergiants - I. Ultraviolet and visible spectral atlas of A-type supergiants

This paper is the first of a series whose aim is to perform a systematic study of A-type supergiant atmospheres and winds. Here we present a spectral atlas of 41 A-supergiants observed by us in high and medium resolution in the visible and ultraviolet. The atlas consists of profiles of the Hα, Hβ, Hγ, Hδ, Hϵ, Ca II (H and K), Na I (D1 and D2), Mg II 4481, Mg II [uv1] and Fe II...