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J/A+AS/114/253 uvby Photometry of Magnetic CP Stars (Adelman+, 1995)
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uvby Photometry of the Magnetic Chemically Peculiar Stars HD 11187, HD 15144,
20 Eri, and HR 8933 and the early F Star HD 14940
Adelman S.J., Boyce P.W.
<Astron. Astrophys. Suppl. Ser. 114, 253 (1995)>
=1995A&AS..114..253A (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry, uvby
Keywords: stars: individual HD 11187 - stars: individual HD 14940 -
stars: individual HD 15144 - stars: individual 20 Eri -
stars: individual HR 8933 - stars: peculiar A - stars: variable
Description:
Four College Automated Photoelectric Telescope differential Stroemgren
uvby photometric observations of four magnetic chemically peculiar
stars are presented. One of our comparison stars was also found to be
variable. Observations of the sharp-lined Si star HD 11187 are best
described as representing a constant star. HD 15144 was also constant
photometrically. However, its comparison star HD 14940 is definitely
variable. But we were not able to find a period. It may be a {delta}
Scu star. Our observations of 20 Eri and the uvby values of Renson &
Manfroid show definite differences in the shapes of the light curve
which suggest that this star may be undergoing a precession of its
rotational axis. When we refined the period by using the minima we
find a value of 1.92893 days. We refined Winzer's period of the
relatively large amplitude variable HR 8933 to 2.86031 days. In v and
b there are definite indications of a weak submaximum within the broad
minimum.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 69 100 uvby HD 11187 Photometry
table3 68 74 uvby HD 15144 and HD 14940 Photometry
table4 68 77 uvby 20 Eri Photometry
table5 68 69 uvby HR 8933 Photometry
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Average and Standard deviation:
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u v b y
HD 11187 v-c ch-c v-c ch-c v-c ch-c v-c ch-c
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1992-93
average 0.343 -0.555 0.733 -0.982 0.805 -1.068 0.860 -1.104
std. dev. 0.006 0.011 0.006 0.008 0.004 0.006 0.004 0.007
1993-94
average 0.341 -0.563 0.739 -0.991 0.810 -1.068 0.866 -1.111
std. dev. 0.005 0.009 0.004 0.004 0.004 0.004 0.004 0.006
1994-95
average 0.339 -0.565 0.739 -0.994 0.809 -1.067 0.866 -1.108
std. dev. 0.004 0.006 0.004 0.005 0.004 0.005 0.004 0.006
all values
average 0.341 -0.563 0.738 -0.991 0.809 -1.068 0.866 -1.109
std. dev. 0.005 0.009 0.004 0.006 0.004 0.005 0.004 0.006
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u v b y
20 Eri v-c ch-c v-c ch-c v-c ch-c v-c ch-c
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1990-91
average 0.074 0.665 0.779 0.162 0.930 0.014 1.023 -0.061
std. dev. 0.041 0.010 0.018 0.009 0.025 0.005 0.023 0.005
1991-92
average 0.082 0.655 0.770 0.157 0.918 0.018 1.012 -0.065
std. dev. 0.033 0.006 0.015 0.005 0.016 0.006 0.016 0.006
1992-93
average 0.115 0.650 0.794 0.152 0.936 0.015 1.031 -0.068
std. dev. 0.041 0.008 0.020 0.005 0.018 0.004 0.019 0.007
1993-94
average 0.091 0.651 0.784 0.159 0.920 0.030 1.025 -0.061
std. dev. 0.043 0.009 0.019 0.006 0.020 0.005 0.018 0.006
1994-95
average 0.088 0.655 0.784 0.159 0.916 0.034 1.019 -0.055
std. dev. 0.036 0.012 0.017 0.006 0.018 0.007 0.019 0.007
all values
average 0.091 0.653 0.782 0.158 0.921 0.026 1.022 -0.061
std. dev. 0.040 0.010 0.019 0.006 0.020 0.009 0.019 0.007
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u v b y
HR 8933 v-c ch-c v-c ch-c v-c ch-c v-c ch-c
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1993-94
average 0.781 -1.371 0.544 -1.225 0.458 -1.163 0.433 -1.133
std. dev. 0.024 0.005 0.008 0.005 0.012 0.004 0.010 0.004
1994-95
average 0.777 -1.369 0.541 -1.223 0.454 -1.164 0.431 -1.133
std. dev. 0.028 0.004 0.009 0.004 0.014 0.003 0.012 0.004
all values
average 0.778 -1.370 0.542 -1.224 0.456 -1.163 0.432 -1.133
std. dev. 0.026 0.005 0.009 0.004 0.013 0.003 0.011 0.004
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u v b y
HD 15144 and
HD 14940 v-ch v-c v-ch v-c v-ch v-c v-ch v-c
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1990-91
average 1.184 1.593 1.193 1.360 1.017 1.433 0.950 1.556
std. dev. 0.006 0.013 0.007 0.020 0.004 0.019 0.008 0.018
1993-94
average 1.188 1.640 1.190 1.390 1.026 1.438 0.958 -0.842
std. dev. 0.006 0.051 0.005 0.031 0.004 0.028 0.006 0.018
1994-95
average 1.191 1.643 1.192 1.392 1.032 1.439 0.964 -0.839
std. dev. 0.006 0.062 0.006 0.043 0.006 0.039 0.005 0.017
all values (There was a change in neutral density filters in the v-c
observations between years 1990-91. The v-c average does not include
the first 8 observations.)
average 1.189 1.636 1.191 1.388 1.028 1.438 0.961 -0.841
std. dev. 0.006 0.055 0.006 0.036 0.007 0.032 0.006 0.018
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See also:
J/A+AS/103/1 : 63 And, HD 192913, HR 8240 & 108 Aqr
J/A+AS/106/333 : Alpha And, HD 184905, HR 8216 & HR 8434
J/A+AS/122/249 : HD 32633, 25 Sex, HR 7224 & HD 200311
J/PASP/109/9 : HR 1643, Theta Aur, 49 Cam, and HR 3724
J/A+AS/125/65 : HD 37776, HR 2258, HR 6958 & 108 Aqr
J/A+AS/125/497 : Theta Vir and 109 Vir
J/A+AS/133/197 : 33 Tau, HD 50169 and HR 7786
J/A+AS/134/53 : HD 15980, HR 1094, 33 Gem and HD 115708
J/A+AS/136/111 : HD 35298, 19 Lyr, HD 192678 and HR 8216
J/A+AS/136/379 : 45 Leo, HR 4330, 49 Her and HR 6718
Byte-by-byte Description of file: table1 table4 table5
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Bytes Format Units Label Explanations
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1- 12 F12.4 d JD Heliocentric Julian Date
15- 19 F5.3 mag umag1 v-c variable-comparison
21- 26 F6.3 mag umag2 ch-c check-comparison
29- 33 F5.3 mag vmag1 v-c variable-comparison
35- 40 F6.3 mag vmag2 ch-c check-comparison
43- 47 F5.3 mag bmag1 v-c variable-comparison
49- 54 F6.3 mag bmag2 ch-c check-comparison
57- 61 F5.3 mag ymag1 v-c variable-comparison
63- 68 F6.3 mag ymag2 ch-c check-comparison
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 12 F12.4 d JD Heliocentric Julian Date
15- 19 F5.3 mag umag1 v-ch variable-check
21- 26 F6.3 mag umag2 v-c variable-comparison
29- 33 F5.3 mag vmag1 v-ch variable-check
35- 40 F6.3 mag vmag2 v-c variable-comparison
43- 47 F5.3 mag bmag1 v-ch variable-check
49- 54 F6.3 mag bmag2 v-c variable-comparison
57- 61 F5.3 mag ymag1 v-ch variable-check
63- 68 F6.3 mag ymag2 v-c variable-comparison
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(End) Simona Mei [CDS] 02-Jul-1995