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From outburst to quiescence: spectroscopic evolution of the high-proper motion cataclysmic variable V1838 Aql | | 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
; Ma. T. García-Díaz
; D. González-Buitrago
; E. de Miguel
; E. de la Fuente
; R. de Anda
; V. Suleimanov
; | | Date: |
6 Nov 2018 | | 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 when the source came
back to quiescence. The object was detected as a weak X-ray source
($0.01103pm0.0014$ counts s$^{-1}$) in the plateau of the superoutburst and
its flux dropped sharply at the end of the fading stage ($0.0006pm0.0005$
counts s$^{-1}$). An extended emission around the source was observed up to 30
days after the peak of the superoutburst, interpreted it as a bow-shock formed
by a wind from the source. The head of the bow-shock is coinciding with the
high-proper motion vector of the source ($v_{perp}=123pm5$ km s$^{-1}$) at a
distance of $d=202pm7$ pc. From spectroscopic observations in quiescence we
confirmed the orbital period value $P_{
m{orb}}=0.0545pm 0.0026$ days,
consistent with early-superhump estimates, and the following orbital
parameters: $gamma= -21pm3$ km s$^{-1}$ and $K_1 = 53pm3$ km s$^{-1}$. The
white dwarf is revealed when the system approaches quiescence, which enables us
to infer the effective temperature of the primary $T_{eff}=11,600pm400$K. The
donor temperature of V1838 Aql is estimated to be $lesssim 2200$K and
suggestive of a system approaching the period minimum. Doppler maps of the
system in quiescence show the presence of the bright hot spot in HeI line at
the expected accretion disc-stream shock position and an unusual structure of
the accretion disc in H$alpha$. | | Source: | arXiv, 1811.2349 | | Services: | Forum | Review | PDF | Favorites | |
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