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Acta Astronomica

Identifiers

ISSN 0001-5237

Publisher

Copernicus Foundation for Polish Astronomy

Additional information

Data set: BazTech

Articles

article

Search for Dormant Black Holes in the OGLE Data

M. Kapusta, P. Mróz

Acta Astronomica > 2023 > Vol. 73, No. 3 > 197--226

Light curves of ellipsoidal variables collected by the Optical Gravitational Lensing Experiment (OGLE) were analyzed, in order to search for dormant black hole candidates. After the preselection based on the amplitude of ellipsoidal modulation, each object was investigated by means of the spectral energy distribution fit, which allowed us to select objects that are in close agreement with the spectrum...
article

AM CVn - System Parameters and Gravitational Waves

J. Smak

Acta Astronomica > 2023 > Vol. 73, No. 3 > 227--232

System parameters of AM CVn are re-determined: M1=0.86±0.18 M☉, M2=0.103±0.0022 M☉, A=1.508±0.100×1010 cm, and i=69±3°. The secondary component of the system is a semi-degenerate helium star loosing mass at a rate M=4.93±1.65×10-9 M☉/yr. The accretion disk is sufficiently hot to avoid thermal instability. The orbital light curve recovered from observations made in 1962 shows minimum shifted to phase...
article

Influence of Water Ice Sublimation Flux on the Change of Cometary Brightness during the Outburs

M. Wesołowski

Acta Astronomica > 2023 > Vol. 73, No. 3 > 243--258

The paper presents a new approach to determining the amplitude of the change of cometary brightness during its outburst. The proposed method is based on two pillars. The first pillar is the analysis of the influence of the sublimation flux of water ice originating from porous agglomerates on the amplitude of the change of cometary brightness. The second pillar is the analysis of the efficiency of...
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