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View article: The Arizona-Montréal spectroscopic survey of hot subluminous stars -- Additional Table and Figures
The Arizona-Montréal spectroscopic survey of hot subluminous stars -- Additional Table and Figures Open
These files are additional material from Appendix D and E of the paper entitled "The Arizona-Montréal spectroscopic survey of hot subluminous stars" accepted for publication in Astronomy and Astrophysics and currently available at https://…
View article: The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope. I. Instrument Overview and In-flight Performance
The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope. I. Instrument Overview and In-flight Performance Open
The Near-Infrared Imager and Slitless Spectrograph (NIRISS) is the science module of the Canadian-built Fine Guidance Sensor onboard the James Webb Space Telescope (JWST). NIRISS has four observing modes: (1) broadband imaging featuring se…
View article: The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope -- I. Instrument Overview and in-Flight Performance
The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope -- I. Instrument Overview and in-Flight Performance Open
The Near-Infrared Imager and Slitless Spectrograph (NIRISS) is the science module of the Canadian-built Fine Guidance Sensor (FGS) onboard the James Webb Space Telescope (JWST). NIRISS has four observing modes: 1) broadband imaging featuri…
View article: The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance
The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance Open
The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science. Notably, JWST will provide the very first obser…
View article: A High-precision Survey of the D/H Ratio in the Nearby Interstellar Medium
A High-precision Survey of the D/H Ratio in the Nearby Interstellar Medium Open
We present high signal-to-noise ratio measurements of the H i Ly α absorption line toward 16 Galactic targets that are at distances between approximately 190 and 2200 pc, all beyond the wall of the Local Bubble. We describe the models used…
View article: The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance
The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance Open
The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science. Notably, JWST will provide the very first obser…
View article: Observations of the Bright Star in the Globular Cluster 47 Tucanae (NGC 104)
Observations of the Bright Star in the Globular Cluster 47 Tucanae (NGC 104) Open
The Bright Star in the globular cluster 47 Tucanae (NGC 104) is a post-asymptotic giant branch (post-AGB) star of spectral type B8 III. The ultraviolet spectra of late-B stars exhibit myriad absorption features, many due to species unobser…
View article: Observations of the Bright Star in the Globular Cluster 47 Tucanae (NGC 104)
Observations of the Bright Star in the Globular Cluster 47 Tucanae (NGC 104) Open
The Bright Star in the globular cluster 47 Tucanae (NGC 104) is a post-AGB star of spectral type B8 III. The ultraviolet spectra of late-B stars exhibit a myriad of absorption features, many due to species unobservable from the ground. The…
View article: Spectral analysis of four surprisingly similar hot hydrogen-rich subdwarf O stars
Spectral analysis of four surprisingly similar hot hydrogen-rich subdwarf O stars Open
\n Context. Post-extreme horizontal branch stars (post-EHB) are helium-shell burning objects evolving away from the EHB and contracting directly towards the white dwarf regime. While the stars forming the EHB have been extensively studied …
View article: Observations of the Ultraviolet-bright Star Y453 in the Globular Cluster M4 (NGC 6121)
Observations of the Ultraviolet-bright Star Y453 in the Globular Cluster M4 (NGC 6121) Open
We present a spectral analysis of the UV-bright star Y453 in M4. Model fits to the star’s optical spectrum yield ∼ 56,000 K. Fits to the star’s FUV spectrum, obtained with the Cosmic Origins Spectrograph on board the Hubble Space Telescope…
View article: Spectral analysis of the sdO standard star Feige 34
Spectral analysis of the sdO standard star Feige 34 Open
We present our current work on the spectral analysis of the hot sdO star Feige 34. We combine high S/N optical spectra and fully-blanketed non-LTE model atmospheres to derive its fundamental parameters (Teff, log g) and helium abundance. O…
View article: Pulsating Hot Subdwarfs in Omega Centauri
Pulsating Hot Subdwarfs in Omega Centauri Open
We recently discovered the first globular cluster hot subdwarf pulsators in Omega Centauri (ω Cen). These stars were initially thought to belong to the class of rapidly pulsating subdwarf B stars, which are well established among the field…
View article: Pulsating hot O subdwarfs in<i>ω</i>Centauri: mapping a unique instability strip on the extreme horizontal branch
Pulsating hot O subdwarfs in<i>ω</i>Centauri: mapping a unique instability strip on the extreme horizontal branch Open
We present the results of an extensive survey for rapid pulsators among Extreme Horizontal Branch (EHB) stars in ω Cen. The observations performed consist of nearly 100 h of time-series photometry for several off-centre fields of the clust…