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J/other/NewA/49.43  MWC 560 UBV(RI)c light curves            (Munari+, 2016)

The 2016 outburst of the unique symbiotic star MWC 560 (= V694 Mon), its long-term BVRI evolution and a marked 331 days periodicity. Munari U., Dallaporta S., Castellani F., Baldinelli L., Righetti G.L., Graziani M., Cherini G., Maitan A., Moretti S., Tomaselli S., Frigo A. <New Astron., 49, 43-49 (2016)> =2016NewA...49...43M (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, cataclysmic ; Photometry, UBVRI Keywords: novae - cataclysmic variables - symbiotic binaries Abstract: After 26 years from the major event of 1990, in early 2016 the puzzling symbiotic binary MWC 560 has gone into a new and even brighter outburst. We present our tight BVRCIC photometric monitoring of MWC 560 (451 independent runs distributed over 357 different nights), covering the 2005-2016 interval, and the current outburst in particular. A stricking feature of the 2016 outburst has been the suppression of the short term chaotic variability during the rise toward maximum brightness, and its dominance afterward with an amplitude in excess of 0.5mag. Similar to the 1990 event when the object remained around maximum brightness for ∼6 months, at the time Solar conjunction prevented further observations of the current outburst, MWC 560 was still around maximum, three months past reaching it. We place our observations into a long term context by combining with literature data to provide a complete 1928-2016 lightcurve. Some strong periodicities are found to modulate the optical photometry of MWC 560. A period of 1860-days regulate the occurence of bright phases at BVRC bands (with exactly 5.0 cycles separating the 1990 and 2016 outbursts), while the peak brightness attained during bright phases seems to vary with a ∼9570-days cycle. A clean 331-day periodicity modulate the Ic lightcurve, where the emission from the M giant dominates, with a lightcurve strongly reminiscent of an ellipsoidal distortion plus irradiation from the hot companion. Pros and cons of 1860 and 331 days as the system orbital period are reviewed, waiting for a spectroscopic radial velocity orbit of the M giant to settle the question (provided the orbit is not oriented face-on). Description: BVRcIc optical photometry of MWC 560 is regularly obtained since 2005 with nine of the ANS Collaboration telescopes, all of them located in Italy. A total of 431 BVRCIC independent runs are presented here, obtained during 357 different nights distributed between Feb 9, 2005 and Apr 29, 2016. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 07 25 51.29 -07 44 08.1 MWC 560 = V* V694 Mon --------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 83 430 Our 2005-2016 BVRcIc photometric observations of MWC 560
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 F13.5 d HJD Heliocentric Julian date 15- 28 A14 "date" Obs.Date UT date (YYYY-MM-DD.ddd) 30- 35 F6.3 mag Bmag ?=99.999 Johnson B magnitude 37- 41 F5.3 mag e_Bmag ?=9.999 rms uncertainty on Bmag (1) 43- 48 F6.3 mag Vmag ?=99.999 Johnson V magnitude 50- 54 F5.3 mag e_Vmag ?=9.999 rms uncertainty on Vmag (1) 56- 61 F6.3 mag Rmag ?=99.999 Cousins R magnitude 63- 67 F5.3 mag e_Rmag ?=9.999 rms uncertainty on Rmag (1) 69- 73 F5.3 mag Imag ?=99.999 Cousins I magnitude 75- 79 F5.3 mag e_Imag ?=9.999 rms uncertainty on Imag (1) 81- 83 I3 --- Tel ANS telescope identification number
Note (1): quoted uncertainty is the total error budget, which quadratically combines the measurement error on the variable with the error associated to the transformation from the local to the standard photometric system (as defined by the photometric comparison sequence).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Dec-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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