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10 papers
X-ray emission from candidate stellar merger remnant TYC 2597-735-1 and its Blue Ring Nebula
Hans Moritz Günther, Keri Hoadley, Maximilian N. Günther +3
Tight binary or multiple star systems can interact through mass transfer and follow vastly different evolutionary pathways than single stars. The star TYC 2597-735-1 is a candidate…
The ODYSSEUS Survey. Motivation and First Results: Accretion, Ejection, and Disk Irradiation of CVSO 109
C. C. Espaillat, G. J. Herczeg, T. Thanathibodee +59
The Hubble UV Legacy Library of Young Stars as Essential Standards (ULLYSES) Director's Discretionary Program of low-mass pre-main-sequence stars, coupled with forthcoming data fro…
Principal component analysis of the Chandra ACIS gain
Hans Moritz Günther, Ákos Bogdán, Nick Durham
Up to 2020, the Chandra ACIS gain has been calibrated using the External Calibration Source (ECS). The ECS consists of an Fe-55 radioactive source and is placed in the ACIS housing…
X-rays in Cepheids: XMM-Newton Observations of Aql
Nancy Remage Evans, Ignazio Pillitteri, Pierre Kervella +13
X-ray bursts have recently been discovered in the Cepheids Cep and Dor modulated by the pulsation cycle. We have obtained an observation of the Cepheid Aql with the XMM…
Ray-tracing a small orbital mission for soft-X-ray polarimetry
Hans Moritz Günther, Herman L. Marshall, Alan Garner
X-ray polarimetry is still largely uncharted territory. With the upcoming launch of IXPE, we will learn a lot more about X-ray polarization at energies above 2 keV, but so far no c…
The dimming of RW Auriga. Is dust accretion preceding an outburst?
Matías Gárate, Til Birnstiel, Sebastian Markus Stammler +1
RW Aur A has experienced various dimming events in the last years, decreasing its brightness by for periods of months to years. Multiple observations indicat…
MARXS: A modular software to ray-trace X-ray instrumention
Hans Moritz Günther, Jason Frost, Adam Theriault-Shay
To obtain the best possible scientific result, astronomers must understand the properties of the available instrumentation well. This is important both when designing new instrumen…
Binary Properties from Cepheid Radial Velocities (CRaV)
Nancy Remage Evans, Leonid Berdnikov, Jennifer Lauer +6
We have examined high accuracy radial velocities of Cepheids to determine the binary frequency. The data are largely from the CORAVEL spectrophotometer and the Moscow version, with…
Astropy: A Community Python Package for Astronomy
The Astropy Collaboration, Thomas P. Robitaille, Erik J. Tollerud +42
We present the first public version (v0.2) of the open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to the com…
Constraints on the ubiquity of coronal X-ray cycles
John Hoffman, Hans Moritz Günther, Nick Wright
Stellar activity cycles are known to be a widespread phenomenon amongst moderately active solar- and late-type stars from long-term periodic variations in chromospheric Ca II H and…