University of Oulu

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, From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 2, June 2019, Pages 2631–2642,

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

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Author: Hernández Santisteban, J. V.1,2; Echevarría, J.1,2; Zharikov, S.3;
Organizations: 1Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, Amsterdam NL–1098 XH, the Netherlands
2Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Apartado Postal 70–264, Ciudad Universitaria, Mexico D.F. C.P. 04510, Mexico
3Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Ensenada, Baja California, C.P. 22830, Mexico
4Astronomy Research Unit, University of Oulu, PO Box 3000, FIN-90014, Finland
5Instituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51, Puebla CP 72000, Mexico
6Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK
7Departamento de Investigacion en Fısica, Universidad de Sonora, Blvd. Rosales y Colosio, Sonora, 83190 Hermosillo, Mexico
8Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
9Departamento de Ciencias Integradas, Universidad de Huelva, Huelva E–21071, Spain
10Instituto de Astronomia y Meteorologia, Departamento de Fisica, CUCEI, Guadalajara, Jalisco 44100, Mexico
11Institut fur Astronomie und Astrophysik, Universität Tubingen, Sand 1, Tubingen D-72076, Germany
12Kazan (Volga region) Federal University, Kremlevskaya str. 18, 420008 Kazan, Russia
13Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 84/32, Moscow 117997, Russia
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Version: published version
Access: open
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Language: English
Published: Oxford University Press, 2019
Publish Date: 2019-09-04


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 ≲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.

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Series: Monthly notices of the Royal Astronomical Society
ISSN: 0035-8711
ISSN-E: 1365-8711
ISSN-L: 0035-8711
Volume: 486
Issue: 2
DOI: 10.1093/mnras/stz798
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: The authors are indebted to Universidad Nacional Autónoma de México (UNAM)/DGAPA for financial support via PAPIIT projects IN111713, IN122409, IN100617, IN102517, IN102617, IN108316, and IN114917. JVHS is supported by a Vidi grant awarded to N. Degenaar by the Netherlands Organization for Scientific Research (NWO) and acknowledges travel support from DGAPA/UNAM. JE acknowledges support from an LKBF travel grant to visit the Anton Panekoek Institute. VN acknowledges the financial support from the visitor and mobility program of the Finnish Centre for Astronomy with ESO (FINCA), funded by the Academy of Finland grant No. 306531. GT acknowledges Consejo Nacional de Ciencia y Tecnologia (CONACyT) grant 166376. E. de la F. wishes to thank CGCI–Universidad de Guadalajara staff for mobility support. VS thanks Deutsche Forschungsgemeinschaft (DFG) for financial support (grant WE 1312/51-1). His work was also funded by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities (3.9780.2017/8.9).
Academy of Finland Grant Number: 306531
Detailed Information: 306531 (Academy of Finland Funding decision)
Copyright information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.