J/A+AS/127/201 Variations of Ap stars in the Geneva system (Manfroid+ 1998)
Variations of Ap stars in the Geneva system
Manfroid J., Burnet M., Renson P.
<Astron. Astrophys. Suppl. Ser. 127, 201 (1998)>
=1998A&AS..127..201M 1998A&AS..127..201M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Ap ; Photometry, Geneva
Keywords: stars: chemically peculiar ; variable
Abstract:
The photometric behaviour of 21 Ap stars has been analyzed from
observations obtained in the Geneva system. Variability has been
detected for 9 Ap stars, as well as for a star which initially was a
comparison star. Preliminary values for the periods are presented as
well as an analytical description of the light curves.
The material has been collected during a 23-night observing run at La
Silla with the 70cm telescope of the Geneva Observatory equipped with
the standard Geneva photometer.
The parameters of a second-order cosine fit to the lightcurves are
stored in the accompanying table. Time origin is JD 2450000.0.
The 17 phase diagrams for each of the 9 stars are presented in 9
postscript files. The observational data are superimposed on the
Fourier fit. Data are differential, except for HD 191439 and HD 192674
which had no suitable comparisons.
Objects:
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RA (2000) DE Designation(s)
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01 25 27.4 -28 46 56 HD 8717
01 36 08.0 -29 54 29 HD 9906
17 52 55.7 -35 01 07 HD 162515
19 52 04.5 +11 37 59 HD 187923
19 54 02.8 +13 16 18 HD 188309
20 12 57.5 -58 46 44 HD 191439
20 18 19.3 -51 05 12 HD 192674
20 15 42.3 +13 50 57 HD 192687
20 29 02.2 -43 14 57 HD 194750
20 30 45.4 -38 34 40 HD 195112
20 57 42.3 -44 06 56 HD 199288
21 05 34.7 -35 42 08 HD 200623
21 13 16.9 -27 37 04 HD 201901
21 26 25.9 -65 22 39 HD 203608
21 51 43.2 -73 10 08 HD 207259
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4 84 153 Variations of Ap stars in the Geneva system
008717.ps 72 4346 Phase diagram for HD 8717, with comp. HD 9906
188309.ps 72 4208 Phase diagram for HD 188309, with comp. HD 162515
and 187923
191439.ps 72 4477 Phase diagram for HD 191439
192674.ps 72 4517 Phase diagram for HD 192674
192687.ps 72 4211 Phase diagram for HD 192687, with comp. HD 162515
and 187923
194750.ps 72 4426 Phase diagram for HD 194750, with comp. HD 199288
195112.ps 72 4402 Phase diagram for HD 195112, with comp. HD 199288
200623.ps 72 4262 Phase diagram for HD 200623, with comp. HD 201901
207259.ps 72 4329 Phase diagram for HD 207259, with comp. HD 203608
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD (Cat. III/135) number
9- 13 F5.3 d Per Period
15- 16 I2 --- Index Index/magnitude (1)
18- 23 F6.4 mag B1 Amplitude of fundamental cosine component
(see Eq. 1 in article)
25- 30 F6.4 mag e_B1 Error on B1
32- 37 F6.4 mag B2 Amplitude of harmonic
39- 44 F6.4 mag e_B2 Error on B2
46- 49 F4.2 rad PHI1 Phase of fundamental component computed with
time origin = JD 2450000
51- 54 F4.2 rad e_PHI1 Error on PHI1
56- 59 F4.2 rad PHI2 Phase of harmonic
61- 64 F4.2 rad e_PHI2 ? Error on PHI2
66- 71 F6.4 mag RMS Scatter around the analytical fit
73- 78 F6.4 mag R Total range of analytical light curve
80- 84 F5.2 --- S/N Signal-to-noise ratio
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Note (1): Code to the Geneva magnitudes or indices
1: V
2: U-B
3: V-B
4: B1-B
5: B2-B
6: V1-B
7: G-B
8: U
9: B
10: B1
11: B2
12: V1
13: G
14: B1-B2
15: B2-V1
16: V1-G
17: B1-V1
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Acknowledgements: Jean Manfroid
(End) Patricia Bauer [CDS] 25-Aug-1997