Hernández Santisteban, J. V.Zharikov, S.Neustroev, V.Miguel Agustino, Enrique de2019-09-302019-09-302019-04Santisteban, J. V., Zharikov, S., Neustroev, V.,.... Miguel Agustino, E. (2019). From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula. Monthly Notices of the Royal Astronomical Society. DOI: https://doi.org/10.1093/mnras/stz7980035-8711http://hdl.handle.net/10272/16682We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high-proper motion cataclysmic variable V1838 Aql. The data were obtained during its 2013 superoutburst and its subsequent quiescent state. An extended emission around the source was observed up to 30 d after the peak of the superoutburst, interpreted it as a bow shock formed by a quasi-continuous outflow from the source in quiescence. The head of the bow shock is coincident with the high-proper motion vector of the source (v⊥ = 123 ± 5 km s−1) at a distance of d = 202 ± 7 pc. The object was detected as a weak X-ray source (0.015 ± 0.002 counts s−1) in the plateau of the superoutburst and its flux lowered by two times in quiescence (0.007 ± 0.002 counts s−1). Spectroscopic observations in quiescence we confirmed the orbital period value Porb = 0.0545 ± 0.0026 d, consistent with early-superhump estimates, and the following orbital parameters: γ = −21 ± 3 km s−1 and K1 = 53 ± 3 km s−1. The white dwarf is revealed as the system approaches quiescence, which enables us to infer the effective temperature of the primary Teff = 11 600 ± 400 K. The donor temperature is estimated 2200K and suggestive of a system approaching the period minimum. Doppler maps in quiescence show the presence of the hotspot in He I line at the expected accretion disc-stream shock position and an unusual structure of the accretion disc in Hα.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Cataclysmic variablesStarsDwarf novaeWhite dwarfV1838 AqlISM: bubblesjournal article10.1093/mnras/stz798open access