The peculiar ejecta of the nova V1425 Aquilae
C. Tappert, L. Celed\'on, L. Schmidtobreick

TL;DR
This study presents optical observations of nova V1425 Aquilae 23 years post-eruption, revealing two distinct ejecta components with different velocities and compositions, and estimates its distance at approximately 3.3 kpc.
Contribution
It provides detailed characterization of the ejecta structure and composition of V1425 Aquilae long after eruption, highlighting the presence of two distinct ejecta components and their possible origins.
Findings
Ejecta consist of two components with different velocities and compositions.
The high-velocity component is asymmetrically located southwest of the binary.
Distance to the nova is estimated at approximately 3.3 kpc.
Abstract
Many important details of the mechanisms underlying the ejection of material during a (classical) nova eruption are still not understood. Here we present optical spectroscopy and narrow-band images of the nova V1425 Aql, 23 years after the nova eruption. We find that the ejecta consist of two significantly different components. The first resembles what is commonly seen in novae, that is, a symmetric distribution centred on the position of the underlying cataclysmic binary and presenting both allowed (hydrogen and helium) and forbidden ([OIII] and [NII]) transitions. The second one, on the other hand, consists of material travelling at an approximately three times higher velocity that is not visible in the allowed transitions, presents a significantly different [NII] - [OIII] ratio, and is located at approximately 2.3 arcsec to the southwest of the position of the binary. Comparing the…
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Taxonomy
TopicsAstrophysical Phenomena and Observations · High-pressure geophysics and materials · Diamond and Carbon-based Materials Research
