2021•arXiv (Cornell University)Open access
Spectroscopy of the Proposed White Dwarf Pulsar ASASSN-V\n J205543.90+240033.5
R. Mark Wagner, P. Garnavich, J. R. Thorstensen, Colin Littlefield, Paula Szkody
Open full text 0 citations
Abstract
We obtained spectra of ASASSN-V J205543.90+240033.5 (J2055), a system that\nshows photometric variations similar to the white dwarf (WD) pulsar AR Scorpii\n(Kato et al. arXiv:2109.03979). Our spectra display a continuum rising steeply\ntoward the blue as well as an array of emission lines. Resolved Balmer and\nPaschen lines are seen with H$\\alpha$ and H$\\beta$ having central absorption\nfeatures. The strongest lines are unresolved CII, CIII, and NIII as well as\ndoubly ionized helium. The spectra are similar to that of YY Hya (Kimeswenger\net al. arXiv:2110.03935), and suggest that J2055 is a post-common envelope\nbinary consisting of a hot compact star irradiating the face of a secondary of\nunknown spectral type. Velocity variations detected from the emission lines\nconfirm the binary nature of J2055. The origin of the 10 minute photometric\nvariation remains uncertain.\n
Open-access reader