Results 21 to 30 of about 4,939 (124)
PTF1J2224+17: A short‐period, high‐field polar
Astronomische Nachrichten, Volume 341, Issue 4, Page 424-429, May 2020., 2020 Abstract We present time‐resolved photometry of the cataclysmic variable PTF1J2224+17 obtained during four nights in October 2018 and January 2019 from Inastars observatory. The object is variable on a period of 103.82 min. Archival Catalina Real‐Time Transient Survey (CRTS), Palomar Transient Factory, and Zwicky Transient Facility‐data show frequent ...
Axel D. Schwope, Bernd D. Thinius
wiley +1 more source
DI Herculis Revisited: Starspots, Gravity Darkening, and 3D Obliquities [PDF]
Astrophysical Journal, 2022 DI Herculis is an eclipsing binary famous for a longstanding disagreement between theory and observation of the apsidal precession rate, which was resolved when both stars were found to be severely misaligned with the orbit.
Yan Liang, J. Winn, S. Albrecht
semanticscholar +1 more source
Rapid variability of accretion in AM Herculis [PDF]
, 2002 We present the last pointed observation of AM Her carried out during the life of the BeppoSAX satellite. It was bright at the beginning of the observation, but dropped to the lowest X-ray level ever observed so far.
B. T. Gänsicke +21 more
core +2 more sources
Discovery of period doubling in BL Herculis stars of the OGLE survey. Observations and theoretical models [PDF]
, 2011 We report the discovery of a period doubling behaviour in a 2.4-d BL Herculis type variable of the Galactic bulge. Another bulge BL Her type star (P = 2.25 d) is a strong period doubling candidate.
R. Smolec +11 more
semanticscholar +1 more source
UBVRI-polarimetry of the AM Herculis star RX J0203.8+2959 [PDF]
Astronomy & Astrophysics, 2001 We present results of the rst simultaneous UBVRI-photopolarimetric observations of the long period (4.6 hrs) AM Herculis system RX J0203.8+2959. The observed circular polarization shows both negative and positive polarization, from +7% to 5% in the B-band.
Katajainen, S. +4 more
openaire +2 more sources
Were the Obliquities in DI Herculis Excited by an Unseen Tertiary Companion? [PDF]
, 2022 The eclipsing binary DI Herculis has garnered interest for several decades because of an apparent disagreement between the observed and calculated values of the apsidal precession rate.
Kassandra R. Anderson, J. Winn
semanticscholar +1 more source
Updated pulsation models for BL Herculis stars [PDF]
, 2007 Context. Population II pulsating variables play a relevant role both as distance indicators and as tracers of the properties of old stellar populations. Aims.
M. Criscienzo
semanticscholar +1 more source
Restoration of Florida scrub vegetation in an old field through 23 years after planting
Restoration Ecology, Volume 27, Issue 2, Page 320-332, March 2019., 2019 Florida scrub, a fire‐maintained, xeromorphic shrubland, hosts many rare and declining species, but most scrub habitat has been lost to development and agriculture. Formerly cultivated sites offer an opportunity to restore Florida scrub. In this 23‐year study, we test whether scrub species could be restored to an old field and whether scrub vegetation ...
Paul A. Schmalzer, Tammy E. Foster
wiley +1 more source
Ecosphere, Volume 7, Issue 6, June 2016., 2016 Abstract Coastal ecosystems in general, and barrier islands in particular, offer unique opportunities to observe ecological patterns and processes in spatially and temporally compressed settings. Harsh abiotic conditions and frequent disturbances limit the number of resident species, and highly dynamic geomorphology may result in a space‐for‐time ...
Spencer N. Bissett +2 more
wiley +1 more source
The serendipituous discovery of a short-period eclipsing polar in 2XMMp [PDF]
, 2008 We report the serendipituous discovery of the new eclipsing polar 2XMMp J131223.4+173659. Its striking X-ray light curve attracted immediate interest when we were visually inspecting the source products of the 2XMMp catalogue.
A. Schwope +20 more
core +1 more source