ASAS J071404+7004.3 -- a close, bright nova-like cataclysmic variable with gusty winds

TL;DR

This study characterizes the bright, nearby nova-like cataclysmic variable ASAS J071404+7004.3 through multi-wavelength observations, revealing its orbital period, mass transfer rate, wind phenomena, and variability effects on its Gaia HR diagram position.

Contribution

The paper provides the first detailed multi-wavelength analysis of ASAS J071404+7004.3, including spectroscopy, X-ray, UV, and photometry, and models the wind emission lines using Monte Carlo simulations.

Findings

Orbital period of 3.28 hours determined.

Mass transfer rate estimated at 4-9 x 10^{-9} solar masses per year.

Detected rapidly changing winds from the accretion disc.

Abstract

Despite being bright ($V=12$) and nearby ($d=212$ pc) ASAS J071404+7004.3 has only recently been identified as a nova-like cataclysmic variable. We present time-resolved optical spectroscopy obtained at the Isaac Newton Telescope together with $\textit{Swift}$ X-ray and ultraviolet observations. We combined these with $\textit{TESS}$ photometry and find a period of 3.28h and a mass transfer rate of $4-9 \times 10^{-9} M_{sun}/yr$. Historical photometry shows at least one low state establishing the system as a VY Scl star. Our high-cadence spectroscopy also revealed rapidly changing winds emanating from the accretion disc. We have modelled these using the Monte Carlo PYTHON code and shown that all the emission lines could emanate from the wind - which would explain the lack of double-peaked lines in such systems. In passing,we discuss the effect of variability on the position of cataclysmic variables in the $\textit{Gaia}$ Hertzsprung-Russell diagram.