J/A+A/374/132 CCD photometry and astrometry of double stars (Lampens+, 2001)
CCD photometry and astrometry for visual double and multiple stars of the
HIPPARCOS catalogue. III. CCD photometry and differential astrometry for 253
southern "intermediate" systems
Lampens P., Oblak E., Duval D., Chareton M.
<Astron. Astrophys. 374, 132 (2001)>
=2001A&A...374..132L 2001A&A...374..132L
ADC_Keywords: Stars, double and multiple ; Photometry, Cousins ; Photometry, CCD
Keywords: techniques: photometric - astrometry - stars: imaging -
stars: binaries: visual - stars: fundamental parameters
Abstract:
We present new astrometric and photometric data for 253 visual double
stars of the "intermediate" class, i.e. with angular separations in
the range 1 to 15 arcsec. The multi-colour observations were obtained
in 1992-94 as part of the ESO Key Programme "Visual Double Stars"
performed at La Silla Observatory (Chile). Differential magnitudes and
colours have been secured in a systematic way while component
magnitudes and colour indices have been determined in the V and I
passbands of the Cousins standard system in good photometric
conditions only. Internal and mean external errors are respectively
smaller than 0.01mag and a few hundred of a magnitude (0.02 to
0.03mag). Relative positions are obtained as a by-product with
internal errors of the order of 0.006arcsec in angular separation and
0.08° in position angle. Final accuracies are thoroughly
discussed: we illustrate the overall excellent quality of the data and
estimate the quality degradation for angular separations barely larger
than the width of the seeing disk.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 77 251 Star positions (from Simbad)
table3.dat 103 254 CCD astrometry and differential photometry
for 239 Hipparcos and 14 non-Hipparcos stars
table4.dat 88 223 CCD VI photometry for 203 Hipparcos and 9
astrometric standard double stars
table5.dat 59 5 CCD only I photometry for 4 Hipparcos and
1 astrometric standard double stars
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/A+AS/139/425 : CCD photometry and astrometry of double stars. II.
(Cuypers+, 1999)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star designation
13- 14 I2 h RAh Right ascension (J2000.0)
16- 17 I2 min RAm Right ascension (J2000.0)
19- 22 F4.1 s RAs Right ascension (J2000.0)
24 A1 --- DE- Declination sign (J2000.0)
25- 26 I2 deg DEd Declination (J2000.0)
28- 29 I2 arcmin DEm Declination (J2000.0)
31- 32 I2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star designation (1)
11- 12 A2 --- m_Name [ 1/] Last digit of HIP number for double
13 A1 --- n_Name [a] (appendix a: astrometric standard)
15 I1 --- Nobs Number of different observations
17 A1 --- Comp [ABC] Component designation to which the
relative data refer
19- 20 I2 --- Nframe Total number of frames
22- 27 F6.3 arcsec rho Mean separation (2)
29- 33 F5.3 arcsec e_rho ? Standard error of the mean separation
35- 40 F6.2 deg theta Mean position angle (2)
42- 45 F4.2 deg e_theta Standard error of the mean position angle
47- 48 I2 --- o_Vmag Number of frames in Cousins filter V
50- 55 F6.3 mag DVmag ? Instrumental magnitude difference in V
57- 61 F5.3 mag e_DVmag ? Standard error of the mean instrumental
magnitude difference in V
63- 64 I2 --- o_Imag Number of frames in Cousins filter I
66- 71 F6.3 mag DImag ? Instrumental magnitude difference in I
72 A1 --- u_DImag Uncertainty flag on DImag
74- 78 F5.3 mag e_DImag ? Standard error of the mean instrumental
magnitude difference in I
80- 88 F9.4 yr Date Date of observation (Besselian year)
90- 94 A5 --- Obs Initials of observer(s)
96-101 F6.3 arcsec dH ? Difference between the CCD and the
Hipparcos relative position
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Note (1): Note on NGC 1647I:
NGC 1647I A = Cl* NGC 1647 H 45 (04 45 15.3 +19 07 23, ICRS 2000.0)
NGC 1647I B = Cl* NGC 1647 H 46 (04 45 17.4 +19 08 07, ICRS 2000.0)
NGC 1647I C = Cl* NGC 1647 H 43 (04 45 14.2 +19 07 57, ICRS 2000.0)
Note (2): Both angular separation and position angle refer to their
mean taken in both filters V and I.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star designation
11 A1 --- n_Name [a] (appendix a: astrometric standard)
13- 24 F12.4 d HJD Julian date
26- 27 I2 --- o_Vmag Number of frames in filter V
29- 34 F6.3 mag VmagA Cousins V magnitude of component A
36- 40 F5.3 mag e_VmagA Standard error of V magnitude of component A
42- 47 F6.3 mag VmagB Cousins V magnitude of component B
49- 53 F5.3 mag e_VmagB Standard error of V magnitude of component B
55- 56 I2 --- o_Imag Number of frames in filter I
58- 61 F4.2 mag V-IA ? Cousins colour index V-I of component A
63- 66 F4.2 mag e_V-IA ? Standard error of colour index of component A
68- 71 F4.2 mag V-IB ? Cousins colour index V-I of component B
73- 76 F4.2 mag e_V-IB ? Standard error of colour index of component B
78- 82 F5.3 mag DVmag Magnitude difference in V
84- 88 F5.2 mag DV-I ? Difference of the colour index V-I
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star designation
11 A1 --- n_Name [a] (appendix a: astrometric standard)
13- 24 F12.4 d JD Julian date
26- 27 I2 --- o_Imag Number of frames in filter I
29- 33 F5.3 mag ImagA Cousins I magnitude of component A
35- 39 F5.3 mag e_ImagA Standard error of I magnitude of component A
41- 46 F6.3 mag ImagB Cousins I magnitude of component B
48- 52 F5.3 mag e_ImagB Standard error of I magnitude of component B
54- 58 F5.3 mag DImag Cousins magnitude difference in I
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Acknowledgements: Patricia Lampens
References:
Oblak et al., Paper I, 1999A&A...346..523O 1999A&A...346..523O
(End) Patricia Bauer [CDS] 14-May-2001