From outburst to quiescence: Spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula

J. V. Hernández Santisteban*, J. Echevarría, S. Zharikov, V. Neustroev, G. Tovmassian, V. Chavushyan, R. Napiwotzki, R. Costero, R. Michel, L. J. Sánchez, A. Ruelas-Mayorga, L. Olguín, M. T. García-Díaz, D. González-Buitrago, E. De Miguel, E. De La Fuente, R. De Anda, V. Suleimanov

*Autor correspondiente de este trabajo

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

5 Citas (Scopus)

Resumen

We 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.

Idioma originalInglés
Páginas (desde-hasta)2631-2642
Número de páginas12
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen486
N.º2
DOI
EstadoPublicada - 1 jun. 2019

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© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

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