SIMBAD references

2017A&A...608A..36T - Astronomy and Astrophysics, volume 608A, 36-36 (2017/12-1)

IGR J19552+0044: A new asynchronous short period polar. Filling the gap between intermediate and ordinary polars.

TOVMASSIAN G., 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. and MIROSHNICHENKO A.S.

Abstract (from CDS):

Context. 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.
Methods. 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.
Results. 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.
Conclusions. 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%).

Abstract Copyright: © ESO, 2017

Journal keyword(s): accretion, accretion disks - stars: magnetic field - binaries: close - binaries: close

VizieR on-line data: <Available at CDS (J/A+A/608/A36): iband.dat vband.dat list.dat sp/*>

Simbad objects: 13

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