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We present time-series spectroscopy and multi-band photometry of the sdBV PG1605+072 carried out simultaneously at the Calar Alto 2.2m and 3.5m telescopes.The periodogram analysis of the radial velocity curves reveals threefrequencies at 2.078, 2.756, and 1.985 mHz for Hbeta and at 2.076, 2.753, and1.978 mHz for Hgamma. The corresponding radial velocity amplitudes are 12.7,8.0, and 7.9 km/s for Hbeta and 14.3, 6.5, and 7.2 km/s for Hgamma.Furthermore, we found five frequencies that are present in all wavelength bandsof the BUSCA photometer. The frequencies detected in the radial velocity curvesare recovered by the photometric measurements. Moreover, additional frequencieswere present in the periodograms which could not be identified in all fourbands simultaneously. The comparison of the amplitudes presented here withprevious results from radial velocity and photometric observations of PG1605+072 shows a significant change or even switch in the power of the modeswithin short time scales, i. e. about one year. No changes in frequency wereregistered and the phases of the modes show no wavelength dependency within ourmulti-band photometry.Comment: 8 pages, 12 figures, accepted by A&

Simultaneous time-series spectroscopy and multi-band photometry of the sdBV PG 1605+072