Results 81 to 90 of about 2,620,915 (156)

Advancing Robust Governance in Turbulent Times: The Role of Multi‐Level Governance, Hybrid Governance, and Negotiated Societal Intelligence

Public Administration, Volume 104, Issue 2, Page 251-265, June 2026.
ABSTRACT New research argues that robust governance based on flexible adaptation and proactive innovation is needed in order to uphold core public functions, purposes, and values in times of societal turbulence. However, we have limited knowledge of the conditions for enhancing robust governance.
Jacob Torfing, Tina Bentzen, Tiziana Caponio, Susana Coroado, Scott Douglas, Steven Nõmmik, Tiina Randma‐Liiv, Chiara Russo, Eva Sørensen, Koen Verhoest   +9 more
wiley   +1 more source

Optical Spectroscopy of the Most Compact Accreting Binary Harboring a Magnetic White Dwarf and a Hydrogen-rich Donor

The Astrophysical Journal Letters
Accreting white dwarfs (WDs) in close binary systems, commonly known as cataclysmic variables (CVs), with orbital periods below the canonical period minimum (≈80 minutes) are rare.
Ilkham Galiullin, Antonio C. Rodriguez, Kareem El-Badry, Ilaria Caiazzo, Paula Szkody, Pranav Nagarajan, Samuel Whitebook   +6 more
doaj   +1 more source

Time-resolved spectroscopy of the AM Herculis-type binary systems QQ VUL and EF ERI

, 1998
Cataclysmic variable stars (CVs) are interacting binary systems. One of the stars (referred to as the primary) is a white dwarf, the other (referred to as the secondary) is usually a late main sequence star such as a red dwarf.
Blakelock, Carolyn J.
core  

A New Window for Studying Intermediate Polars and Tilted Accretion Disk Precession

The Astrophysical Journal
TV Col is a long-period eclipsing intermediate polar (IP) prototype star for the negative superhump (NSH) system. We investigate the eclipse minima, eclipse depth, and NSH amplitude based on TESS photometry.
Qi-Bin Sun, Sheng-Bang Qian, Li-Ying Zhu, Wen-Ping Liao, Er-Gang Zhao, Fu-Xing Li, Xiang-Dong Shi, Min-Yu Li   +7 more
doaj   +1 more source

HS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049 : four new long-period cataclysmic variables [PDF]

, 2005
We present time-resolved optical spectroscopy and photometry of four relatively bright (V ∼ 14.0−15.5) long-period cataclysmic variables(CVs) discovered in the Hamburg Quasar Survey: HS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049.
Araujo-Betancor, S., A. Aungwerojwit, H.-J. Hagen, C. Papadimitriou, D. Engels, Hagen, H.-J., Harlaftis, E. T., S. Araujo-Betancor, U. Heber, Gaensicke, B. T., E. T. Harlaftis, Rodríguez-Gil, P., Heber, U., S. Katajainen, Katajainen, S., R. E. Fried, Lehto, H., P. Rodríguez-Gil, Fried, R. E., Aungwerojwit, A., B. T. Gänsicke, H. Lehto, Engels, Dieter, Papadimitriou, C.   +23 more
core   +1 more source

Searching for Accreting Compact Binary Systems from Spectroscopy and Photometry: Application to LAMOST Spectra

The Astrophysical Journal
Compact objects undergoing mass transfer exhibit significant (and double-peaked) H _α emission lines. Recently, new methods have been developed to identify black hole X-ray binaries and calculate their systematic parameters using H _α line parameters ...
Xinlin Zhao, Song Wang, Jifeng Liu
doaj   +1 more source

Preface to the Special Collection “Are There Scientific Revolutionaries? Scientific, Historical, and Philosophical Perspectives”

Natural Sciences, Volume 6, Issue 3, July 2026.
Ute Deichmann, Bretislav Friedrich
wiley   +1 more source

TESS Light Curves of Cataclysmic Variables. IV. A Synoptic View of Eclipsing Old Novae and Novalike Variables

The Astrophysical Journal Supplement Series
Based mainly on the months-long 2 minutes time-resolution light curves observed by the Transiting Exoplanet Survey Telescope (TESS) space mission of 48 eclipsing old novae and novalike variables (commonly referred to as NLs) selected from the Ritter ...
Albert Bruch
doaj   +1 more source

On the eclipsing cataclysmic variable star HBHA 4705-03

, 2013
We present observations and analysis of a new eclipsing binary HBHA 4705-03. Using decomposition of the light curve into accretion disk and hot spot components, we estimated photometrically the mass ratio of the studied system to be q=0.62 +-0.07. Other fundamental parameters was found with modeling. This approach gave: white dwarf mass M_1 = (0.8 +- 0.
Rutkowski, A., Ak, T., Marsh, T. R., Eker, Z.   +3 more
openaire   +4 more sources

Spectroscopic classification of cataclysmic variable candidates

, 2005
We present low-resolution optical spectroscopy for six cataclysmic variable candidates and the old nova V888 Cen. We confirm the classification as cataclysmic variable for LB 9963 and FQ Mon, while the other four candidates turn out to be different types
Galli, L, Schmidtobreick, L, Whiting, A, Carver, AJ, Tappert, C   +4 more
core