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HD 31766


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Further identification of ROSAT all-sky survey sources in Orion
We report on the identification of 22 ROSAT All-Sky Survey (RASS) X-raysources distributed in the general direction of the Orion star-formingregion. The X-ray sample contains sources from the ROSAT bright sourcecatalogue and from previous detections. The optical identifications arebased on intermediate-resolution spectroscopy and UBV Johnson photometryusing a 1m-class telescope. The strengths of the Hα , Na I D_2 andlithium lines for the stellar counterparts are evaluated applying thespectral subtraction technique, using templates of the same spectraltype. Radial velocities of the optical counterparts are also reported.Thirteen of the optical counterparts show the lithium absorption line intheir spectra and have radial velocities consistent with the Orion starforming region. Four of these objects can be classified as new bona-fideT Tauri stars.Based on observations collected at Catania Astrophysical Observatory,Italy.

The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Avci
Sað Açýklýk:04h58m53.03s
Yükselim:+08°58'28.0"
Görünürdeki Parlaklýk:8.426
Uzaklýk:446.429 parsek
özdevim Sað Açýklýk:1.8
özdevim Yükselim:-8
B-T magnitude:8.521
V-T magnitude:8.434

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 31766
TYCHO-2 2000TYC 685-698-1
USNO-A2.0USNO-A2 0975-01251295
HIPHIP 23153

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