J/A+A/484/463 Wra 751 light curves (Sterken+, 2008)
Wra 751, a Luminous Blue Variable developing an S Doradus cycle.
Sterken C., van Genderen A.M., Plummer A., Jones A.F.
<Astron. Astrophys. 484, 463 (2008)>
=2008A&A...484..463S 2008A&A...484..463S
ADC_Keywords: Stars, variable ; Photometry, UBV ; Photometry, uvby
Keywords: stars: variables: general - stars: individual: general -
stars: early-type - stars: supergiants - techniques: photometric
Abstract:
Wra 751 is a Luminous Blue Variable that lately exhibits strong
changes in light and colour. We summarize the available photometry of
Wra 751, present new photometric observations, and discuss these data
with special attention on the systematic differences between the
various data sources. In addition, we establish an empirical
relationship between b-y and B-V for this class of stars. Wra 751 is
a strong-active member of the S Dor class exhibiting very-long term
S Doradus phases with an amplitude of about two magnitudes in V and
a cycle length of several decades. The associated B-V colour-index
amplitude is about 0.4mag. At this moment this LBV, which is the
reddest member of the class, goes through the bright (and red) stage
of a long-term S Dor cycle. The S Dor behaviour of this system shows
some resemblance to the temporal characteristics of the Galactic LBV
AG Car: time scales and amplitudes of light and colour variability
are very similar.
Objects:
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RA (2000) DE Designation(s)
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11 08 40.1 -60 42 52 Wra 751 = Wray 15-751
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 26 59 Walraven photometry (transformed to
Johnson V and B-V)
table3.dat 21 278 ASAS differential V photometry
table4.dat 35 33 Stromgren y, b-y and transformed B-V
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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- 11 F11.3 d HJD Heliocentric Julian date
14- 19 F6.3 mag Vmag Walraven V magnitude transformed to Johnson V
22- 26 F5.3 mag B-V Walraven V-B clour index transformed to
Johnson B-V
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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
16- 21 F6.3 mag Vmag ASAS V magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian date
16- 21 F6.3 mag ymag Stromgren y magnitude on Johnson V scale
24- 28 F5.3 mag b-y Stromgren b-y colour index
31- 35 F5.3 mag B-V ?=- Johnson B-V colour index derived from b-y
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Acknowledgements:
Christiaan Sterken, csterken(at)vub.ac.be
(End) Patricia Vannier [CDS] 28-Mar-2008