J/A+A/404/L29 VB differential photometry of WR30a (Paardekooper+, 2003)
New type of brightness variations of the colliding wind WO4+O5((f)) binary WR30a
Paardekooper S.J., Van der Hucht K.A, van Genderen A., Brogt E.,
Gieles M., Meijerink R.
<Astron. Astrophys. 404, L29 (2003)>
=2003A&A...404..L29P
ADC_Keywords: Stars, double and multiple ; Stars, Wolf-Rayet ; Photometry, UBV
Keywords: stars: binaries - stars: Wolf-Rayet - stars: individual: WR30a
Abstract:
We present new photometric observations in Johnson V and B of WR30a,
revealing relative dramatic changes in brightness of 0.2mag. These
variations occur on a time scale of hours, and are only seen in V. We
argue that they are not caused by dust extinction, but either by a
dramatic change in the strength of the C IV 5801-12Å emission line
doublet due to a de-excitation process, or by some unknown continuum
effect.
Description:
The tables present photometric monitoring of WR 30a in the UBV
system, as described in the paper. There are three data sets. All
observations were done using the Dutch 90cm telescope at ESO, La
Silla, Chile, through Johnson V and B filters.
Objects:
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RA (2000) DE Designation(s)
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10 51 06.0 -62 17 02 WR 30 = HD 94305
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 31 40 Brogt (02-22/07/01) V light curve (Set I)
table3.dat 31 21 Meijerink (30/10-15/11/01) V light curve (Set II)
table4.dat 31 71 Gieles (15/11-15/12/01) V light curve (Set III)
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Byte-by-byte Description of file: table2.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 d HJD-2450000 Heliocentric Julian Date - 2450000
11- 20 F10.7 mag deltaV Differential V magnitude
22- 31 F10.7 mag deltaB Differential B magnitude
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Acknowledgements: Sijme-Jan Paardekooper
(End) Patricia Bauer [CDS] 03-Jun-2003