SIMBAD references

2015MNRAS.453..483K - Mon. Not. R. Astron. Soc., 453, 483-496 (2015/October-2)

Phase-resolved spectroscopy and Kepler photometry of the ultracompact AM CVn binary SDSS J190817.07+394036.4.

KUPFER T., GROOT P.J., BLOEMEN S., LEVITAN D., STEEGHS D., MARSH T.R., RUTTEN R.G.M., NELEMANS G., PRINCE T.A., FURST F. and GEIER S.

Abstract (from CDS):

Kepler satellite photometry and phase-resolved spectroscopy of the ultracompact AM CVn type binary SDSS J190817.07+394036.4 are presented. The average spectra reveal a variety of weak metal lines of different species, including silicon, sulphur and magnesium as well as many lines of nitrogen, beside the strong absorption lines of neutral helium. The phase-folded spectra and the Doppler tomograms reveal an S-wave in emission in the core of the Hei 4471 Å absorption line at a period of Porb = 1085.7±2.8 s identifying this as the orbital period of the system. The Siii, MgII and the core of some Hei lines show an S-wave in absorption with a phase offset of 170°±15° compared to the S-wave in emission. The Nii, SIIII and some helium lines do not show any phase variability at all. The spectroscopic orbital period is in excellent agreement with a period at Porb = 1085.108(9) s detected in the 3 yr Kepler light curve. A Fourier analysis of the Q6-Q17 short-cadence data obtained by Kepler revealed a large number of frequencies above the noise level where the majority shows a large variability in frequency and amplitude. In an Observed-minus-computed analysis, we measured a |{dot}P|∼1.0 x10–8s/s for some of the strongest variations and set a limit for the orbital period to be |{dot}P|<10^-10 s/s. The shape of the phase-folded light curve on the orbital period indicates the motion of the bright-spot. Models of the system were constructed to see whether the phases of the radial velocity curves and the light-curve variation can be combined to a coherent picture. However, from the measured phases neither the absorption nor the emission can be explained to originate in the bright-spot.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): accretion, accretion discs - binaries: close - stars: individual: SDSS J190817.07+394036.4

Simbad objects: 7

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2021.05.06-14:54:57

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