J/A+A/409/1037 AK Sco ubvy and Geneva differential photometry (Alencar+, 2003)
The pre-main sequence spectroscopic binary AK Scorpii revisited.
Alencar S.H.P., Melo C.H.F., Dullemond C.P., Andersen J., Batalha C.,
Vaz L.P.R., Mathieu R.D.
<Astron. Astrophys. 409, 1037 (2003)>
=2003A&A...409.1037A 2003A&A...409.1037A
ADC_Keywords: Stars, pre-main sequence ; Binaries, spectroscopic ;
Photometry, uvby ; Photometry, Geneva
Keywords: stars: pre-main-sequence - stars: binaries: spectroscopic -
stars: formation - stars: individual: AK Sco - line: profiles
Abstract:
We present an analysis of 32 high-resolution echelle spectra of the
pre-main sequence spectroscopic binary AK Sco obtained during 1998 and
2000, as well as a total of 72 photoelectric radial-velocity
observations from the period 1986-1994. These data allow considerable
improvement of the period and other orbital parameters of AK Sco. Our
analysis also includes eight series of photometric observations in the
uvby and Geneva seven-color systems from 1987, 1989, 1990, 1992, 1994
and 1997.
Description:
uvby and Geneva photometry of AK Sco obtained between 1987 and 1994 at
ESO, La Silla.
The file table3a.dat contains 1253 uvby observations obtained with
Stroemgren Automatic Telescope (SAT), instrumental system. The
transformation coefficients to standard indices can be found in Vaz et
al., 1998, Cat. J/A+AS/130/254. SAO 208122 was used as primary
comparison star and SAO 208143 as secondary comparison star. Standard
indices (1994), for SAO 208122 (6 measurements, std errors quoted):
V=9.8345±0.0022, b-y=0.4506±0.0012, m1=0.0958±0.0022,
c1=0.9355±0.0034; for SAO 208143 (3 meas.): V=8.8353±0.0024,
b-y=0.7193±0.0037, m1=0.2903±0.0044, c1=0.4670±0.0029.
File table3b.dat contains 278 observations obtained in 1989 with the
Swiss telescope, in the Geneva system.
Objects:
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RA (2000) DE Designation(s)
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16 54 44.8 -36 53 19 AK Sco = HD 152404
16 52 30.7 -36 43 44 SAO 208122 = HD 152019
16 53 25.9 -36 39 35 SAO 208143 = HD 152195
18 09 36.3 -23 34 05 HD 165999
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3a.dat 62 1253 *uvby differential photometry, AK Sco - SAO 208122
table3b.dat 62 278 *Geneva differential photometry, AK Sco - HD 165999
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Note on table3a.dat: Data obtained at ESO with SAT (instrumental system) in
1987 (54 obs.), 1989 (810 obs.), 1990 (18 obs.) 1992 (28 obs.),
1993 (198 obs.), 1994 (145 obs.).
Note on table3b.dat: Data obtained at ESO in 1989 (70cm Swiss telescope,
Geneva system).
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Byte-by-byte Description of file: table3a.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian date
15- 20 F6.3 mag Dymag Differential Stroemgren y magnitude
22- 27 F6.3 mag D(b-y) Differential Stroemgren b-y colour index
29- 34 F6.3 mag Dm1 Differential Stroemgren m1 index
36- 41 F6.3 mag Dc1 Differential Stroemgren c1 index
43- 48 F6.3 mag Dbmag Differential Stroemgren b magnitude
50- 55 F6.3 mag Dvmag Differential Stroemgren v magnitude
57- 62 F6.3 mag Dumag Differential Stroemgren u magnitude
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Byte-by-byte Description of file: table3b.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian date
16- 20 F5.3 mag DVjmag Differential standard V magnitude
23- 27 F5.3 mag DUmag Differential Geneva U magnitude
29- 34 F6.3 mag DVmag Differential Geneva V magnitude
36- 41 F6.3 mag DB1mag Differential Geneva B1 magnitude
44- 48 F5.3 mag DB2mag Differential Geneva B2 magnitude
51- 55 F5.3 mag DV1mag Differential Geneva V1 magnitude
58- 62 F5.3 mag DGmag Differential Geneva G magnitude
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Acknowledgements: Luiz Paulo Ribeiro Vaz
(End) Silvia Helena Paixao Alencar [DF-ICEx-UFMG] 30-Sep-2003