228 citations · 1.5k across the 43 of their papers we have counts for
7 papers · 1 filter
Constraining the magnetic field on white dwarf surfaces; Zeeman effects and fine structure constant variation
J. Hu, J. K. Webb, T. R. Ayres +12
White dwarf atmospheres are subjected to gravitational potentials around times larger than occur on Earth. They provide a unique environment in which to search for any possi…
The Advanced Spectral Library (ASTRAL): Reference Spectra for Evolved M-Stars
Kenneth G. Carpenter, Krister E. Nielsen, Gladys V. Kober +3
The HST Treasury Program "Advanced Spectral Library Project: Cool Stars" was designed to collect representative, high quality ultraviolet spectra of eight evolved F-M type cool sta…
The extreme O-type spectroscopic binary HD 93129A
D. Gruner, R. Hainich, A. A. C. Sander +6
HD 93129A was classified as the earliest O-type star in the Galaxy (O2~If*) and is considered as the prototype of its spectral class. However, interferometry shows that this object…
Serendipitous X-ray Sources in the Chandra HRC Field around Alpha Centauri
Thomas R. Ayres
For more than a decade, Alpha Centauri AB (G2V+K1V) has been observed by Chandra, in a long-term program to follow coronal (T~1MK) activity cycles of the two sunlike stars. Over 20…
First high-resolution look at the quiet Sun with ALMA at 3 mm
A. Nindos, C. E. Alissandrakis, T. S. Bastian +9
We present an overview of high resolution quiet Sun observations, from disk center to the limb, obtained with the Atacama Large mm and sub-mm Array (ALMA) at 3 mm. Seven quiet Sun…
Beyond the Coronal Graveyard
Thomas R. Ayres
New Chandra High Resolution Camera pointings on the "non-coronal" red giant Arcturus (HD124897; Boo: K1.5III) corroborate a tentative soft X-ray detection in a shorter explorat…