Results 71 to 80 of about 1,023 (124)

BlackGEM observations of compact pulsating stars

Astronomy & Astrophysics
Context. While space-based telescopes offer unparalleled precision for asteroseismology, ground-based observations remain crucial for identifying compact pulsator candidates and enabling their pulsational study through multi-colour photometry.
Ranaivomanana P., Johnston C., Uzundag M., Groot P. J., Kupfer T., Bloemen S., Vreeswijk P. M., van Roestel J. C. J., Pieterse D. L. A., Paice J., Kosakowski A., Ramsay G., Aerts C.   +12 more
doaj   +1 more source

Observing orbital decay in the ultracompact hot subdwarf binary system ZTFJ213056.71+442046.5

Astronomy & Astrophysics
Context. Ultracompact Galactic binary systems emit low-frequency gravitational waves in the millihertz regime. The emission of gravitational waves causes these systems to lose angular momentum, which is detectable by observing the decay of the orbital ...
Teckenburg Paul, Kupfer Thomas, Brown Alex J., Roth Martin M., Ben Daya Fatma, Knoche Jörg, Lali Ananthu K., Vješnica Stella, Roje Paško, Kretlow Mike, Cikota Stefan   +10 more
doaj   +1 more source

Toward 3D orbits of wide sdO/B binaries

Astronomy & Astrophysics
Hot subdwarf stars (sdO/Bs) are widely considered to be products of binary evolution. A significant fraction of them is found in long-period or wide binaries (P > 500 d) with main-sequence (MS) companions, likely resulting from a stable mass-transfer ...
Deshmukh K., Geier S., Sana H., Dawson H., Dorsch M., Frost A. J., Heber U., Kupfer T., Picco A., Vučković M.   +9 more
doaj   +1 more source

Mapping the Local Halo: Statistical Parallax Analysis of SDSS Low-Mass Subdwarfs [PDF]

, 2013
We present a statistical parallax study of nearly 2000 M subdwarfs with photometry and spectroscopy from the Sloan Digital Sky Survey (SDSS). Statistical parallax analysis yields the mean absolute magnitudes, mean velocities, and velocity ellipsoids for ...
Bochanski, John J
core  

On the Capability of Oxidovanadium(IV) Derivatives to Act as All-Around Catalytic Promoters Since the Prebiotic World. [PDF]

Molecules, 2020
Campitelli P, Crucianelli M.
europepmc   +1 more source

SALT spectroscopy of hydrogen-deficient stars

, 2018
The majority of hot subdwarfs lie on or close to the helium main-sequence. Many have hydrogen-rich surfaces, but a substantial fraction have hydrogen-depleted or hydrogen-deficient surfaces.
Miszalski, Brent, Jeffery, C. Simon, Jeffery, C. Simon (5791475), Miszalski, Brent (5791478)   +3 more
core   +1 more source

Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary. [PDF]

Nat Astron, 2019
Rebassa-Mansergas A, Parsons SG, Dhillon VS, Ren J, Littlefair SP, Marsh TR, Torres S.   +6 more
europepmc   +1 more source

Systematic Effects On Photometric Parallaxes For Fgk Dwarfs And Subdwarfs

Hipparcos trigonometric parallaxes were used to establish a preliminary absolute magnitude calibration in terms of effective temperature, metallicity and evolutionary stage indicators for FGK dwarfs and subdwarfs.
X. Luri, C. Jordi, F. Figueras, E. Masana, J. Torra   +4 more
core  

Fine structure in the phase space distribution of nearby subdwarfs

, 2006
We analysed the fine structure of the phase space distribution function of nearby subdwarfs using data extracted from various catalogues. Applying a new search strategy based on Dekker's theory of galactic orbits, we found four overdensely populated
B. Fuchs, M. I. Arifyanto
core   +1 more source

Evidence for neutron capture in heavy-metal hot subdwarfs

Astronomy & Astrophysics
Context. Most hot subdwarfs (sdO/B) are low-mass core-helium-burning stars formed through binary interaction. A subgroup of intermediate He-rich sdOBs shows extreme heavy metal (Z > 30) enrichments exceeding 104 times solar, particularly in Zr or Pb ...
Dorsch M., Jeffery C. S., Deprince J., Dougan D. J., Beauraind S., Dupuis H., Battich T., Quinet P., Heber U., Scott L. J. A., Geier S.   +10 more
doaj   +1 more source