J/A+A/608/A36 IGR J19552+0044 BV light curves and spectra (Tovmassian+, 2017) ================================================================================ IGR J19552+0044: a new asynchronous short period polar. Filling the gap between intermediate and ordinary polars. Tovmassian G.H., Gonzalez-Buitrago D., Thorstensen J., Kotze E., Breytenbach H., Schwope A., Bernardini F., Zharikov S.V., Hernandez M.S., Buckley D.A.H., de Miguel E., Hambsch F.-J., Myers G., Goff W., Cejudo D., Starkey D., Campbell T., Ulowetz J., Stein W., Nelson P., Reichart D.E., Haislip J.B., Ivarsen K.M., LaCluyze A.P., Moore J.P., Miroshnichenko A.S. =2017A&A...608A..36T (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Binaries, cataclysmic ; Photometry ; Spectroscopy Keywords: binaries: close - novae, cataclysmic variables - magnetic field Abstract: Based on XMM-Newton X-ray observations IGR J19552+0044 appears to be either a pre-polar or an asynchronous polar. Aims. We conducted follow-up optical observations to identify the sources and periods of variability precisely and to classify this X-ray source correctly. Extensive multicolor photometric and medium- to high-resolution spectroscopy observations were performed and period search codes were applied to sort out the complex variability of the object. We found firm evidence of discording spectroscopic (81.29+/-0.01m) and photometric (83.599+/-0.002m) periods that we ascribe to the white dwarf (WD) spin period and binary orbital period, respectively. This confirms that IGR J19552+0044 is an asynchronous polar. Wavelength dependent variability and its continuously changing shape point at a cyclotron emission from a magnetic WD with a relatively low magnetic field below 20MG. The difference between the WD spin period and the binary orbital period proves that IGR J19552+0044 is a polar with the largest known degree of asynchronism (0.97 or 3%). Description: The files contain photometric data in V and I filters as well as spectra of the object obtained in low resolution mode. The data are reduced to magnitudes at heliocentric times indicating mid-exposure. The magnitudes in Johnson V- and I-bands are calibrated using the secondary standards in the filed of the object. The spectra are flux and wavelength calibrated. Some spectra suffer from inadequate subtraction of telluric lines. Objects: --------------------------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------------------------- 19 55 12.47 +00 45 36.6 IGR J19552+0044 = 2MASS J19551247+0045365 --------------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file list.dat 79 41 List of spectra sp/* . 41 Individual fits spectra iband.dat 24 4658 I band photometry of IGR J19552+0044 vband.dat 24 2578 V band photometry of IGR J19552+0044 -------------------------------------------------------------------------------- Byte-by-byte Description of file: list.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 25 A25 --- FileName Name of the spectrum file in subdirectory sp 27- 36 A10 "date" Obs.Date Observation date 38- 40 I3 --- Nsp Spectrum number within the observation date 42- 79 A38 --- Title Title of the file -------------------------------------------------------------------------------- Byte-by-byte Description of file: iband.dat vband.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 F11.6 --- HJD Heliocentric Julian date (HJD-2450000) 13- 17 F5.2 mag mag Magnitude in Band 19- 22 F4.2 mag e_mag rms uncertainty on mag 24 A1 --- Band [IV] Observed band (Johnson) -------------------------------------------------------------------------------- Acknowledgements: Gagik Tovmassian, gag(at)astro.unam.mx ================================================================================ (End) Gagik Tovmassian[OAN SAT, Mexico], Patricia Vannier [CDS] 05-Dec-2017