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Outliers: multicolour photometry guiding the search for evolved binary systems in the globular cluster 47 Tucanae
Fabiola Campos, I. Pelisoli, S. Kamann +11
We use Hubble Space Telescope multicolour photometry of the globular cluster 47 Tucanae to uncover a population of 24 objects with no previous classification that are outliers from…
Blue Large-Amplitude Pulsators (BLAPs): possible origin, evolutionary status, and nature of their pulsations
Alejandro H. Córsico, Alejandra D. Romero, Leandro G. Althaus +2
The Blue Large-Amplitude Pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of K and surface grav…
Spectroscopic classification and Gaia DR2 parallaxes of new nearby white dwarfs among selected blue proper motion stars
R. -D. Scholz, H. Meusinger, A. Schwope +2
AIMS: With our low-resolution spectroscopic observing program for selected blue proper motion stars, we tried to find new white dwarfs (WDs) in the solar neighbourhood. METHODS: We…
The McDonald Observatory search for pulsating sdA stars: asteroseismic support for multiple populations
Keaton J. Bell, Ingrid Pelisoli, S. O. Kepler +8
Context. The nature of the recently identified "sdA" spectroscopic class of star is not well understood. The thousands of known sdAs have H-dominated spectra, spectroscopic surface…
The sdA problem - III. New extremely low-mass white dwarfs and their precursors from Gaia astrometry
Ingrid Pelisoli, Keaton J. Bell, S. O. Kepler +1
The physical nature of the sdA stars---cool hydrogen-rich objects with spectroscopic surface gravities intermediate between main sequence and canonical mass white dwarfs---has been…
The sdA problem - II. Photometric and Spectroscopic Follow-up
Ingrid Pelisoli, S. O. Kepler, D. Koester +3
Subdwarf A star (sdA) is a spectral classification given to objects showing H-rich spectra and sub-main sequence surface gravities, but effective temperature lower than the zero-ag…
Comparing the asteroseismic properties of pulsating pre-extremely low mass white dwarf and delta Scuti stars
Julieta P. Sanchez Arias, Alejandra D. Romero, Alejandro H. Corsico +5
Pulsating extremely low-mass pre-white dwarf stars (pre-ELMV), with masses between ~0.15 Msun and ~0.30 Msun, constitute a new class of variable stars showing g- and possibly p-mod…
On the evolutionary status and pulsations of the recently discovered Blue Large-Amplitude Pulsators (BLAPs)
Alejandra D. Romero, A. H. Córsico, L. G. Althaus +2
The Blue Large-Amplitude Pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of ~30 000 K and surface gravities of log g ~ 4…
The sdA problem I: Physical Properties
Ingrid Pelisoli, S. O. Kepler, D. Koester
The so-called sdA stars are defined by having H-rich spectra and surface gravities similar to hot subdwarf stars, but effective temperature below the zero-age horizontal branch. Th…