4 papers
V407 Vul: a triple star system with an AM CVn detectable by gravitational wave observatories
James Munday, Antonio C. Rodriguez, Nicole Reindl +23
The AM CVn class includes mass transferring, ultra-compact double white dwarf binaries with orbital periods on the timescale of minutes. A long-standing puzzle is that none of the…
Adaptive optics imaging of the nuclei of Seyfert 2 galaxies: An unexpectedly high incidence of nuclear stellar rings
Nina Mackensen, Jochen Heidt, Francisco Pozo Nuñez
The study uses adaptive‑optics near‑infrared imaging of 18 Seyfert 2 galaxies to compare with HST optical/IR data and finds that about 44% host nuclear stellar rings, a higher inci…
Variability of Central Stars of Planetary Nebulae with the Zwicky Transient Facility. II. Long-Timescale Variables including Wide Binary and Late Thermal Pulse Candidates
Soumyadeep Bhattacharjee, Nicole Reindl, Howard E. Bond +14
In this second paper on our variability survey of central stars of planetary nebulae (CSPNe) using ZTF, we report 11 long-timescale variables with variability timescales ranging fr…
How an overweight and rapidly rotating PG 1159 star in the Galactic halo challenges evolutionary models
Nina Mackensen, Nicole Reindl, Klaus Werner +2
PG 1159 stars are thought to be progenitors of the majority of H-deficient white dwarfs. Their unusual He-, C-, and O-dominated surface composition is typically believed to result…