Results 51 to 60 of about 2,620,915 (156)

Theoretical Light-curve Models of the Symbiotic Nova CN Cha—Optical Flat Peak for 3 Yr

The Astrophysical Journal, 2023
CN Cha is a slow symbiotic nova characterized by a 3 yr long optical flat peak followed by a rapid decline. We present theoretical light curves for CN Cha, based on hydrostatic approximation, and estimate the white-dwarf (WD) mass to be ∼0.6 M _☉ for a ...
Mariko Kato, Izumi Hachisu
doaj   +1 more source

Destructive Leadership in Public Crisis Management: Perceptions From Santa Catarina, Brazil, During the COVID‐19 Pandemic

Journal of Contingencies and Crisis Management, Volume 34, Issue 4, December 2026.
ABSTRACT Although the study of destructive leadership is a growing field, the adverse behaviours of public leaders during crises, such as the COVID‐19 pandemic, remain largely underexplored in academic literature. This study aims to bridge this gap by examining participants' perceptions of destructive leadership behaviours in public crisis management ...
Waldemir Paschoiotto, Ana Cláudia Lara Crizel, Simone Sehnem   +2 more
wiley   +1 more source

A spectrophotometric survey of cataclysmic variable stars

The Astronomical Journal, 1982
A sample of dwarf novae and other cataclysmic variable stars were observed using the multichannel spectrophotometer on the 5-m Hale reflector. A preliminary qualitative description of the continuum distributions is given and a discussion of the Balmer emission-line fluxes is made.
J. B. Oke, R. A. Wade
openaire   +1 more source

TESS Light Curves of Cataclysmic Variables. VI. Intermediate Polars

The Astrophysical Journal Supplement Series
The long and (almost) continuous high-cadence light curves provided by the TESS space mission are ideally suited to study in detail brightness variations in stellar sources on the broad range of timescales between minutes and months.
Albert Bruch
doaj   +1 more source

Integrating and assessing metacommunity drivers of ecosystem function and resilience in benthic algal systems

Oikos, Volume 2026, Issue 10, October 2026.
Understanding the scales and mechanisms by which species composition interacts with ecosystem functions is critical for forecasting the effects of environmental perturbations on ecosystem services. However, the linkages between what regulates the ecosystem functions of dispersal‐capable networks of communities (metacommunities) and what regulates a ...
Thomas P. Shannon, Evelyn E. Gaiser
wiley   +1 more source

Photometric Analysis of the Cataclysmic Variable Star LT Eri

The Astronomical Journal
LT Eri is a long-period eclipsing cataclysmic variable star (CV). This study investigates its outbursts, negative superhumps (NSHs), tilted-disk precession, eclipse-depth variations, and observed minus calculated ( O – C ) behavior, using photometric ...
Qi-Bin Sun, Sheng-Bang Qian, Li-Ying Zhu, Qin-Mei Li, Fu-Xing Li, Min-Yu Li, Ping Li   +6 more
doaj   +1 more source

The K-band spectrum of the cataclysmic variable RXJ 0502.8+1624 (Tau 4)

, 2005
We present the K-band spectrum of the cataclysmic variable RXJ 0502.8+1624 (Tau 4). The spectrum shows a broad, smooth hump, with no absorption lines from the secondary star visible.

core   +1 more source

Spectroscopy and Orbital Periods of Four Cataclysmic Variable Stars [PDF]

, 2001
We present spectroscopy and orbital periods Porb of four relatively little-studied cataclysmic variable stars. The stars and their periods are: AF Cam, Porb = 0.324(1) d (the daily cycle count is slightly ambiguous); V2069 Cyg (= RX J2123.7+4217), 0 ...
Taylor, Cynthia J, Thorstensen, John R
core   +1 more source

Evolution of Cataclysmic Variables with Binary-driven Mass Loss during Nova Eruptions

The Astrophysical Journal
The discrepancies between observations and theoretical predictions of cataclysmic variables (CVs) suggest that there exists unknown angular-momentum-loss mechanism(s) besides magnetic braking and gravitational radiation.
Wen-Shi Tang, Xiang-Dong Li, Zhe Cui
doaj   +1 more source

Gravitational Radiation From Binary Systems With Time Varying Masses

Annalen der Physik, Volume 538, Issue 8, August 2026.
We extend the standard approach pioneered in the works by Peters and Mathews to include the mass loss processes of the binary components, by obtaining the variations due to gravitational radiation of the main physical parameters. As an application of our results we consider gravitational radiation emission in binary magnetar systems.
Teodora M. Matei, Cristian A. Croitoru, Tiberiu Harko   +2 more
wiley   +1 more source