2017A&A...608A..36T

Query : 2017A&A...608A..36T

2017A&A...608A..36T - Astronomy and Astrophysics, volume 608A36-36 (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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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* BL Hyi CV* 01 41 00.3996430344 -67 53 27.470100660       15.340   DC: 221 0
2 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   DA 453 0
3 2MASS J05243042+4244506 CV* 05 24 30.4643309280 +42 44 50.460570600           ~ 55 0
4 V* BY Cam CV* 05 42 48.8013535344 +60 51 31.376128608   16.60       ~ 270 0
5 V* V834 Cen CV* 14 09 07.2863511816 -45 17 16.023776676       15.301   M6.5 333 0
6 PG 1550+191 CV* 15 52 47.1968971224 +18 56 28.844471472   16.4 15.46 17.0   M6.5Ve 202 0
7 V* V2301 Oph CV* 18 00 35.5317201576 +08 10 13.920836628           ~ 107 0
8 V* EP Dra CV* 19 07 06.1869434379 +69 08 43.874477499   18       ~ 69 0
9 V* V1432 Aql CV* 19 40 11.4199326288 -10 25 25.771706256     14.40 15.437   ~ 181 0
10 2MASS J19551247+0045365 CV* 19 55 12.4799164872 +00 45 36.864000540   15.6 16 16.0   ~ 41 0
11 V* V393 Pav CV* 19 57 11.5514523936 -57 38 22.427884104           ~ 30 0
12 V* V1500 Cyg No* 21 11 36.5809818696 +48 09 01.952490204           ~ 820 0
13 V* CD Ind CV* 21 15 41.0450813472 -58 40 54.058462428           ~ 108 0

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