J/A+AS/117/335 Optical positions of radio emitting stars (Assafin+, 1996)
Optical positions of radio emitting stars.
Assafin M., Andrei A.H., Puliaev S.P., Jilinski E.G., Vieira Martins R.,
Vieira G.G., de Oliveira W.M.
<Astron. Astrophys. Suppl. Ser. 117, 335 (1996)>
=1996A&AS..117..335A 1996A&AS..117..335A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, radio ; Positional data
Keywords: astrometry - reference systems - radio continuum: stars
Description:
In order to contribute to the alignment of the radio and optical
reference frames, 50 stars with confirmed radio emission and published
radio positions were observed by astrographical means. Additionally,
two confirmed radio-stars of fainter magnitude were observed using a
CCD direct camera with a long focus, large aperture telescope. The
reductions are made relative to four catalogues: the Carlsberg
Meridian Catalogue #4, the International Reference Stars Catalogue,
the Positions and Proper Motion Catalogue and the Astrographical
Catalogue of Reference Stars. The best results were obtained with the
CAMC catalogue. The plate error of a radio star position is 0.07" for
both right ascension and declination, rising to 0.10"-0.20" for bright
stars. Ten of the program stars are not in the HIPPARCOS Input
Catalogue and 12 do not belong to any of the major reference
catalogues used. As soon as the HIPPARCOS results become available,
its reference stars already measured in the plates will enable us to
get positions for those 10 radio stars in the HIPPARCOS system.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2 136 50 Positions obtained astrographically and their
comparison against major optical catalogues
table4 136 2 Positions obtained by mosaicing of CCD images
and their comparison against major optical
catalogues
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2 table4
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Name of the radio star
14- 18 F5.2 mag Vmag Visual magnitude
20- 21 A2 --- Sp Spectral type
23- 29 F7.2 yr Ep-1900 Epoch of the astrographic observation (1900+)
31- 32 I2 h RAh Right ascension (J2000), at epoch (1)
34- 35 I2 min RAm Right ascension (J2000), at epoch (1)
37- 42 F6.3 s RAs Right ascension (J2000), at epoch (1)
44- 48 F5.3 s e_RAs rms uncertainty on right ascension
50 A1 --- DE- Declination sign
51- 52 I2 deg DEd Declination (J2000), at epoch (1)
54- 55 I2 arcmin DEm Declination (J2000), at epoch (1)
57- 61 F5.2 arcsec DEs Declination (J2000), at epoch (1)
63- 66 F4.2 arcsec e_DEs rms uncertainty on declination
69- 73 F5.2 arcsec DRA ? Difference in RA with CAMC#4
76- 80 F5.2 arcsec DDE ? Difference in DE with CAMC#4
83- 87 F5.2 arcsec DRA2 Difference in RA with ACRS
90- 94 F5.2 arcsec DDE2 Difference in DE with ACRS
97-101 F5.2 arcsec DRA3 Difference in RA with PPM
104-108 F5.2 arcsec DDE3 Difference in DE with PPM
111-115 F5.2 arcsec DRA4 ? Differences in RA with the
PPM High Precision Subset
118-122 F5.2 arcsec DDE4 ? Difference in DE with the
PPM High Precision Subset
125-129 F5.2 arcsec DRA5 Difference in RA with IRS
132-136 F5.2 arcsec DDE5 Difference in DE with IRS
--------------------------------------------------------------------------------
Note (1): RA and DE are referred to CAMC#4 catalogue
--------------------------------------------------------------------------------
Courtesy: M. Assafin,
References:
ACRS: Astrographic Catalog Reference Stars, cat. I/171
CAMC4: Carlsberg Meridian Catalog, La Palma; number 4, cat. I/147
IRS: International Reference Stars, cat. I/172
PPM: Catalog of Positions and Proper Motions (North), cat. I/146
(South), cat. I/193
(End) Patricia Bauer [CDS] 26-Mar-1996