J/AJ/120/1548 V523 Cas UBVRCIC photometry (Elias+, 2000)
Photospheric spots and a chromospheric plage on V523 Cassiopeiae
Elias II N.M., Koch R.H.
<Astron. J. 120, 1548 (2000)>
=2000AJ....120.1548E 2000AJ....120.1548E
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing -
stars: individual (V523 Cassiopeiae) - stars: late-type - stars: spots
Abstract:
The cool, overcontact, close binary, V523 Cassiopeiae was observed
with the 1 m reflector at the US Naval Observatory, Flagstaff Station.
The photometry was very good, with a precision on the order of a few
millimagnitudes, but not numerous enough for complete light-curve
analyses (e.g., differential corrections). A conventional published
synthesis has been found acceptable as a fiducial model, and most of
the observational weight has been used to develop a spot model for the
stars and to support the validity of theoretical limb-darkening
coefficients. Both photospheres and chromospheres contribute to the
model. This result indicates that multifilter measures of this and
similarly cool binaries are necessary for fuller descriptions of
stellar activity cycles. A number of newly determined times of minimum
light solidify the published rate of period variability.
Objects:
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RA (2000) DE Designation(s)
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00 40 06 +50 13.0 V523 Cas
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 77 17 Comparison star {DELTA}Mi for UBVRCI_C filters
table3.dat 30 488 V523 Cassiopeiae delmags
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [2/18] Comparison star number
4- 10 F7.4 mag Umag U magnitude
12- 17 F6.4 mag e_Umag rms uncertainty on Umag
19- 25 F7.4 mag Bmag B magnitude
27- 32 F6.4 mag e_Bmag rms uncertainty on Bmag
34- 40 F7.4 mag Vmag V magnitude
42- 47 F6.4 mag e_Vmag rms uncertainty on Vmag
49- 55 F7.4 mag Rcmag RC magnitude (Cousins)
57- 62 F6.4 mag e_Rcmag rms uncertainty on Rcmag
64- 70 F7.4 mag Icmag IC magnitude (Cousins)
72- 77 F6.4 mag e_Icmag rms uncertainty on Icmag
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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- 13 F13.5 d HJD Heliocentric Julian date
15 A1 --- Filt [UBVRI] Filter
17- 23 F7.4 mag delmag Differential magnitude in filter (1)
25- 30 F6.4 mag e_delmag rms uncertainty on delmag
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Note (1): Average system differential magnitudes ("delmags") for comparison
stars 2 through 18 versus V523 Cas.
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History: From AJ electronic version
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 25-Sep-2000