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Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm
| Search for the compact 511 keV radiation source in the Galactic centre region with SIGMA
Results of a search for the compact 511 keV radiation source in thegeneral region of the Galactic center (GC) with SIGMA are presented. Noevidence of any compact 511 keV radiation source in the region wasfound. The combined 2-sigma upper limits for the three possiblecandidate sources are listed. These upper limits are far below thesteady 0.0027 gamma/s sq cm 511 keV flux observed by SMM, assuming thatit came from a point source in the GC region. They thus rule out thepossibility of a single point source for the emission of the GC 511 keVradiation. A reanalysis of HEAO-3 data shows that, if the instrumentalline width of the observed GC 511 keV line is taken into account, thefall 1979 and spring 1980 fluxes are consistent with the SMM. A diffusesolution to the GC 511 keV radiation is inferred.
| MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington
MK spectral classifications are given for 591 stars which are used fortime and latitude observations at Mizusawa and Washington. Theclassifications in the MK system were made by slit spectrograms ofdispersion 73 A/mm at H-gamma which were taken with the 91 cm reflectorat the Okayama Astrophysical Observatory. Photometric observations in UBV were made with the 1-meter reflector at the Flagstaff Station of U.S.Naval Observatory. The spectrum of HD 139216 was found to show a strongabsorption line of H-beta. The following new Am stars were found:HD9550, 25271, 32784, 57245, 71494, and 219109. The following new Apstars were found: HD6116, 143806, 166894, 185171, and 209260. The threestars, HD80492, 116204, and 211376, were found to show the emission inCaII H and K lines.
| Photoelectric UBV photometry for 317 PZT and VZT stars
UBV data were taken of 317 stars to fill gaps in photoelectric recordsneeded for establishing a terrestrial reference frame for earthorientation purposes. The study supplied the magnitudes and colors andaided in identifying nearby stars without trigonometric parallaxes. Thesurvey averaged over three observations of each object. A complete tableof the V, B-V, U-B and number of observations of each object isprovided.
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| Takýmyýldýz: | Baliklar |
| Sað Açýklýk: | 00h26m03.68s |
| Yükselim: | +20°08'48.7" |
| Görünürdeki Parlaklýk: | 6.664 |
| Uzaklýk: | 289.855 parsek |
| özdevim Sað Açýklýk: | -7.7 |
| özdevim Yükselim: | 6.3 |
| B-T magnitude: | 6.634 |
| V-T magnitude: | 6.662 |
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