English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present spectroscopy and time-series photometry of the newly discovereddwarf nova 1RXS J232953.9+062814. Photometry in superoutburst reveals asuperhump with a period of 66.06(6) minutes. The low state spectrum showsBalmer and HeI emission on a blue continuum, and in addition shows a richabsorption spectrum of type K4 +- 2. The absorption velocity is modulatedsinusoidally at P_orb = 64.176(5) min, with semi-amplitude K = 348(4) km/s. Thelow-state light curve is double-humped at this period, and phased as expectedfor ellipsoidal variations. The absorption strength does not vary appreciablyaround the orbit. The orbital period is shorter than any other cataclysmicvariable save for a handful of helium-star systems and V485 Centauri (59minutes). The secondary is much hotter than main sequence stars of similarmass, but is well-matched by helium-enriched models, indicating that thesecondary evolved from a more massive progenitor. A preliminary calculation inwhich a 1.2 solar-mass star begins mass transfer near the end of H burningmatches this system's characteristics remarkably well.Comment: accepted to Astrophysical Journal Letters; 14 pages, 3 eps figures +  1 jpg greyscale figur

1RXS J232953.9+062814: A Dwarf Nova with a 64 Minute Orbital Period and a Conspicuous Secondary Star