From outburst to quiescence : spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula
Abstract
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 count 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 ≲2200 K 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.
Citation
Hernández Santisteban , J V , Echevarría , J , Zharikov , S , Neustroev , V , Tovmassian , G , Chavushyan , V , Napiwotzki , R , Costero , R , Michel , R , Sánchez , L J , Ruelas-Mayorga , A , Olguín , L , García-Díaz , M T , González-Buitrago , D , de Miguel , E , de la Fuente , E , de Anda , R & Suleimanov , V 2019 , ' From outburst to quiescence : spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula ' , Monthly Notices of the Royal Astronomical Society , vol. 486 , no. 2 , pp. 2631-2642 . https://doi.org/10.1093/mnras/stz798
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Rights
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at www.XXXX.xxx / https://doi.org/10.1093/mnras/stz798
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