J/A+AS/116/1 UBV photometry of MWC560 (Tomov+, 1996)
Monitoring MWC560=V694 Mon in 1990-1995. I.
Conventional and high-speed UBV photometry
Tomov T., Kolev D., Ivanov M., Antov A., Jones A., Mikolajewski M.,
Lepardo A., Passuello R., Saccavino S., Sostero G., Valentinuzzi T.,
Bellas-Velidis Y., Dapergolas A., Munari U.
<Astron. Astrophys. Suppl. Ser. 116, 1 (1996)>
=1996A&AS..116....1T 1996A&AS..116....1T (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, UBV ; Stars, variable
Keywords: stars: binaries: close - stars: binaries: symbiotic -
stars: individual: MWC560 - stars: magnetic fields -
stars: mass-loss
Description:
We present results of an extensive photometric monitoring campaign of
the peculiar emission star MWC 560 that covers the range 1990-1995.
The time interval corresponds to the length of the proposed orbital
period of this highly peculiar binary, which attracted considerable
interest in January-April 1990, when absorption components, shifted by
-6000km/s from corresponding emission lines, were observed. Here we
present photometric data secured during: 113 nights of conventional
UBV photoelectric photometry, 45 nights of high speed UBV
photoelectric photometry to study the flickering activity, and 682
visual photometric estimates. MWC 560 has experienced a decrease in
magnitude since the bright (V=9.2mag) phase in 1990. After the minimum
reached in May 1994 (V=10.7mag), the star is currently increasing
slowly in brightness. The decrease has been accompanied in all bands
by large fluctuations superimposed on the mean trend. The B-V
colour has shown a steady increase by 0.0.33mag/yr. U-B has remained
stable at -0.07mag since late 1990. In all the observing nights
devoted to high speed photometry we observed flickering activity in
MWC 560. The data show that the flickering amplitude {DELTA}U
increases with the decrease of the U magnitude. Quasi-periodic
variations have always been detected. A period of ∼70min has been
observed in ∼13 nights which is close to the ∼60min quasi-period
reported by Michalitsianos et al. (1993). However, no coherent
variability is traceable throughout the whole set of flickering data.
Object:
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RA (2000) DE Name
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07 23 25.9 -07 38 03 MWC 560 = V694 Mon
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 37 140 UBV photoelectric photometry
table2 15 682 Visual brightness estimates of MWC560 from
Nelson (New Zealand)
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See also:
J/A+AS/122/43 : V694 Mon plate spectra (Tomov+ 1997)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Date of the observation
13- 17 F5.2 mag Vmag Star's magnitude in V band
18 A1 --- u_Vmag Uncertainty flag on Vmag
20- 23 F4.2 mag B-V B-V colour
24 A1 --- u_B-V Uncertainty flag on B-V
26- 30 F5.2 mag U-B []? U-B colour
31 A1 --- u_U-B Uncertainty flag on U-B
33 I1 --- o_Vmag Number of independent measurements
35- 37 A3 --- Obs Identification of the Observatory (1)
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Note (1): The observatories are:
Roz = Bulgarian National Astronomical Observatory Rozhen,
Bel = Belogradchik Astronomical Observatory,
Kry = Kryoneri Observatory in Greece,
Tor = Torun Observatory in Poland,
Ols = Olsztyn Observatory in Poland,
Suh = Mt. Suhora Observatory in Poland,
Rem = Remanzacco Observatory of the Assoziazione Friulana di
Astronomia e Meteorologia (Italy).
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 10 F10.2 d JD Date of the observation
12- 15 F4.1 mag Vmag Visual brightness estimates
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Courtesy: T. Tomov,
(End) Patricia Bauer [CDS] 15-Jan-1996