%R 2000A&AS..143..145S
%J-179
%A Schoenfelder V.
%A Bennett K.
%A Blom J.J.
%A Bloemen H.
%A Collmar W.
%A Connors A.
%A Diehl R.
%A Hermsen W.
%A Iyudin A.
%A Kippen R.M.
%A Knoedlseder J.
%A Kuiper L.
%A Lichti G.G.
%A McConnell M.
%A Morris D.
%A Much R.
%A Oberlack U.
%A Ryan J.
%A Stacy G.
%A Steinle H.
%A Strong A.
%A Suleiman R.
%A van Dijk R.
%A Varendorff M.
%A Winkler C.
%A Williams O.R.
%T The first COMPTEL source catalogue.
%M h1678R
%F 2000.03.23
%B The imaging Compton telescope COMPTEL aboard NASA's Compton Gamma-Ray Observatory has opened the MeV gamma-ray band as a new window to astronomy. COMPTEL provided the first complete all-sky survey in the energy range 0.75 to 30 MeV. The catalogue, presented here, is largely restricted to published results. It contains firm as well as marginal detections of continuum and line emitting sources and presents upper limits for various types of objects. The numbers of the most
significant detections are 32 for steady sources and 31 for gamma-ray bursters. Among the continuum sources, detected so far, are spin-down pulsars, stellar black-hole candidates, supernova remnants, interstellar clouds, nuclei of active galaxies, gamma-ray bursters, and the Sun during solar flares. Line detections have been made in the light of the 1.809 MeV ^26^Al line, the 1.157 MeV ^44^Ti line, the 847 and 1238 keV ^56^Co lines, and the neutron capture line at 2.223 MeV.
For the identification of galactic sources, a modelling of the diffuse galactic emission is essential. Such a modelling at this time does not yet exist at the required degree of accuracy. Therefore, a second COMPTEL source catalogue will be produced after a detailed and accurate modelling of the diffuse interstellar emission has become possible.
%K gamma rays: observations - catalogs - surveys

%R 2000A&AS..143..181D
%J-192
%A de Vries W.H.
%A O'Dea C.P.
%A Barthel P.D.
%A Thompson D.J.
%T Identifications and spectroscopy of Gigahertz Peaked Spectrum sources. II.
%M H1857
%F 2000.03.23
%B We present deep optical and near-infrared imaging as well as optical spectroscopy of as yet unclassified hosts of Gigahertz Peaked Spectrum (GPS) radio sources. Identifications were obtained for 14 objects, several of which are new. Spectroscopic follow-up yielded redshift information on 7 GPS objects. The remaining 18 objects of our sample without redshifts await spectroscopy with 8 m class facilities.
%K galaxies: active - galaxies: distances and redshifts - (galaxies:) quasars: emission lines

%R 2000A&AS..143..193B
%J-210
%A Barnstedt J.
%A Gringel W.
%A Kappelmann N.
%A Grewing M.
%T The ORFEUSII Echelle spectrum of HD 93521: A reference for interstellar molecular hydrogen.
%M ds1827
%F 2000.03.23
%B During the second flight of the ORFEUS-SPAS mission in November/December 1996, the Echelle spectrometer was used extensively by the Principal and Guest Investigator teams as one of the two focal plane instruments of the ORFEUS telescope. The spectrum of \object{HD 93521} was obtained during this mission with a total integration time of 1740s. This spectrum shows numerous sharp interstellar absorption lines. We identified 198 lines of molecular hydrogen including at least 7
lines with a high velocity component. Also most of the 67 identified interstellar metal lines are visible with a high velocity component. We present plots of the complete ORFEUSII Echelle spectrum together with tables of all identified interstellar absorption lines including all 14 detectable HI lines. In addition several identified stellar lines, partially with narrow absorption components, and stellar wind lines are given in a separate table.
%K stars: individual: HD 93521 - ISM: lines and bands - ISM: molecules - ultraviolet: ISM - ultraviolet: stars

%R 2000A&AS..143..211B
%J-213
%A Berdnikov L.N.
%A Dambis A.K.
%A Vozyakova O.V.
%T Galactic Cepheids. Catalogue of light-curve parameters and distances.
%M ds1601
%F 2000.03.23
%B We report a new version of the catalogue of distances and light-curve parameters for Galactic classical Cepheids. The catalogue lists amplitudes, magnitudes at maximum light, and intensity means for 455 stars in BVRI filters of the Johnson system and (RI)_C_ filters of the Cron-Cousins system. The distances are based on our new multicolour set of PL relations and on our Cepheid-based solution for interstellar extinction law parameters and are referred to an LMC distance
modulus of 18.25.
%K Cepheids

%R 2000A&AS..143..215K
%J-226
%A Kaluzny J.
%A Olech A.
%A Thompson I.
%A Pych W.
%A Krzeminski W.
%A Schwarzenberg-Czerny A.
%T RR Lyrae variables in the globular cluster M 5.
%M ds9019
%F 2000.03.23
%B We present V-band CCD photometry of 65 RR Lyr variables from the globular cluster M 5. We have estimated the basic physical parameters for 16 RRc stars and 26 RRab stars using a Fourier decomposition of the light curves of the variables. The mean values of mass, luminosity, effective temperature and relative helium abundance for the RRc stars are measured to be M=0.54M_{sun}_, log(L/L_{sun}_)=1.69, T_eff_=7353K and Y=0.28, respectively. For the RRab variables the
derived mean values of absolute magnitude, metallicity and effective temperature are: M_V_=0.81, [Fe/H]=-1.23 and T_eff_=6465K. We find that the V amplitude of an RRab star for a given period is a function of metal abundance rather than Oosterhoff type. We find significant problems with the calibration of both the zero point and the scale of the luminosities measured with the Fourier technique. The apparent distance modulus derived from RRc stars is equal to 14.47+/-0.11 and
it is in good agreement with recent determinations. On the other hand distance modulus obtained from the sample of RRab stars (calibrated by the Baade-Wesselink observations of field RR Lyr variables) is significantly smaller and equal to 14.27+/-0.04
%K stars: RR Lyr - stars: variables - globular clusters: individual: M 5

%R 2000A&AS..143..227P
%J-263
%A Pohjolainen S.
%A Portier-Fozzani F.
%A Ragaigne D.
%T Comparison of 87 GHz solar polar structures with EUV and soft X-ray emission.
%M ds1721
%F 2000.03.23
%B Polar radio brightenings at 87 GHz (3.5 mm) are compared for the first time with features seen in EUV and soft X-rays. The data consist of nearly simultaneous full disk images and maps from Metsaehovi Radio Observatory, SOHO/EIT, and Yohkoh/SXT on 9 selected days near the solar minimum (1996-1997). The observed radio brightenings corresponded to various features seen in EUV, such as diffuse or localized intensity enhancements (e.g., bright points and bases of polar
plumes), and intensity depressions of varying sizes (e.g., coronal holes). Some of these features were also visible in soft X-rays. The visibility of radio bright coronal holes seemed to depend on how much of the polar area was exposed, due to the variation of the B_0_-angle. The observed radio depressions near the solar poles were very well correlated with coronal holes and other EUV and/or soft X-ray intensity drops. More than half of the coronal holes, or coronal hole-like
intensity drops in EUV and soft X-rays, had radio brightenings inside them. Therefore coronal holes do not have uniform radio brightness at 87 GHz. Many of the bright points seen at lower latitudes in the EIT and SXT images had no, or just faint, counterparts in the millimeter radio maps. It appears that for an EUV bright point to show up at 87 GHz it has to be bright and/or spatially large also in soft X-rays.
%K Sun: chromosphere - Sun: transition region - Sun: corona - Sun: radio radiation - Sun: UV radiation - Sun: X-rays

%R 2000A&AS..143..265P
%J-267
%A Puliaev S.
%A Penna J.L.
%A Jilinski E.G.
%A Andrei A.H.
%T Solar diameter observations at Observatorio Nacional in 1998-1999.
%M ds9217
%F 2000.03.23
%B In January 1997, at the Observatorio Nacional (ON), Rio de Janeiro, Brazil, digital CCD observations of the solar diameter began with a Danjon astrolabe adapted for solar observations and equipped with a variable angle reflecting prism. The prism enables observations of the Sun several times per day and all year round at the southern latitude {phi}=-22{deg} 54'. As of June 1999, about 9000 observations have been made. The mean value of the apparent semi-diameter is 
959.13"+/-0.01". Here we report on the results obtained between July 1998 and June 1999. In 162 days 4276 observations were made. For this period the mean apparent semi-diameter is 959.07"+/-0.02". No significant difference between the apparent semi-diameters is found as observed on the East and West sides of the meridian. The results of the observations are updated every month and available in electronic form in the SIMBAD database and at the World Wide Web page of the ON,
Solar Radius Data: http://obsn.on.br/radius/ .
%K Sun: general, fundamental parameters

%R 2000A&AS..143..269S
%J-301
%A Szymczak M.
%A Hrynek G.
%A Kus A.J.
%T A survey of the 6.7 GHz methanol maser emission from IRAS sources. I. Data.
%M ds1829
%F 2000.03.23
%B We report the first results of a search for 6.7 GHz methanol masers in the direction of 1399 IRAS objects north of declination -20{deg} with the flux densities greater than 100 Jy at 60 {mu}m and the flux density ratio F_60_/F_25_>1. Observations were made with the sensitivity of 1.7 Jy and the velocity resolution of 0.04km/s using the 32-m Torun radio telescope. Maser emission was found in 182 sources, including 70 new detections. 32 new sources were identified with
objects of radio emission associated with star-forming regions. Comparison of the present data set with other observations suggests that about 65% of methanol masers exhibit moderate or strong variations on time-scales of about 4 and 8 years.
%K masers - surveys - stars: formation - ISM: molecules - radio lines: ISM - HII regions

%R 2000A&AS..143..303D
%J-333
%A De Breuck C.
%A van Breugel W.
%A Roettgering H.J.A.
%A Miley G.
%T A sample of 669 ultra steep spectrum radio sources to find high redshift radio galaxies.
%M ds1811
%F 2000.03.23
%B Since radio sources with Ultra Steep Spectra (USS; {alpha}<~-1.30; S {prop.to}{nu}^{alpha}^) are efficient tracers of high redshift radio galaxies (HzRGs), we have defined three samples of such USS sources using the recently completed WENSS, TEXAS, MRC, NVSS and PMN radio-surveys. Our combined sample contains 669 sources with S_1400_ >10mJy and covers virtually the entire sky outside the Galactic plane (|b|>15{deg}). For our 2 largest samples, covering {delta}>-35{deg},
we selected only sources with angular sizes {Theta}<1'. For 410 sources, we present radio-maps with 0.3" to ~5" resolution from VLA and ATCA observations or from the FIRST survey, which allows the optical identification of these radio sources. Comparison with spectrally unbiased samples at similar flux density levels, shows that our spectral index, flux density, and angular size selections do not affect the angular size distribution of the sample, but do avoid significant
contributions by faint foreground spiral galaxies. We find that the spectral index distribution of 143000 sources from the WENSS and NVSS consists of a steep spectrum galaxy and a flat spectrum quasar population, with the relative contribution of flat spectrum sources doubling from S_1400_>0.1Jy to S_1400_>2.5Jy. The identification fraction of our USS sources on the POSS (R<~20) is as low as 15%, independent of spectral index {alpha}<-1.30. We further show that 85% of the
USS sources that can be identified with an X-ray source are probably contained in galaxy clusters, and that {alpha}<-1.6 sources are excellent Galactic pulsar candidates, because the percentage of these sources is four times higher in the Galactic plane. Our sample has been constructed to start an intensive campaign to obtain a large sample of high redshift objects (z>3) that is selected in a way that does not suffer from dust extinction or any other optical bias.
%K surveys - galaxies: active - radio continuum: galaxies

%R 2000A&AS..143..335L
%J-342
%A Ling J.F.
%A Prieto C.
%T Micrometer measurements of double stars made at the Cote D'Azur and Calar Alto observatories.
%M ds1822
%F 2000.03.23
%B We report 312 micrometer measurements of 155 visual double stars made with the 50 cm refractor at the Cote D'Azur observatory (Nice, France) and with the 152 cm telescope at Calar Alto observatory (Almeria, Spain).
%K astrometry - stars: binaries: visual - method: observational

%R 2000A&AS..143..343H
%J-355
%A Henden A.
%A Munari U.
%T UBV(RI)_C_ photometric comparison sequences for symbiotic stars.
%M ds1838
%F 2000.03.23
%B We present accurate UBV(RI)_C_ photometric sequences around 20 symbiotic stars. The sequences extend over wide brightness and color ranges, and are suited to cover quiescence as well as outburst phases. The sequences are intended to assist both present time photometry as well as measurement of photographic plates from historical archives.
%K catalogs - stars: binaries: symbiotic - techniques: photometric