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Relation between photometric and parameter errors of star clusters
Li, Zhongmu; Liu, Xuejie
Many observations supply only photometry data with large uncertainties. The study of star clusters based on such data is important for astrophysical studies, although photometric uncertainty affects the accuracy of results. In order to estimate the parameter uncertainties that are caused by photometric errors, this work quantifies the influence of…
A helium nova in the Large Magellanic Cloud - the faint supersoft X-ray source [HP99]159
Kato, Mariko; Hachisu, Izumi; Saio, Hideyuki
We propose a helium nova model for the Large Magellanic Cloud (LMC) supersoft X-ray source (SSS) [HP99]159. This object has long been detected as a faint and persistent SSS for about 30 yr, and recently been interpreted to be a source of steady helium-shell burning, because no hydrogen lines are observed. We find that the object can also be interp…
Bipolar Nebula AFGL 2688 in the System of Post-AGB Star V1610 Cyg
Klochkova, V. G.; Panchuk, V. E.; Yushkin, M. V.
We present a survey of the results of photometric and spectral observations of a nebula AFGL 2688 in the system of post-AGB star V1610 Cyg. Apart from the analysis of the published results, our new spectral observations of the star at the BTA over 2002–2022 are also given consideration. A new understanding of the kinematics of gas and dust in the …
The Catalog of Resolved Spectroscopic Binaries: Development and Description
Malkov, O. Yu.; Pakhomova, P. V.; Zeleke, D. B. +2 more
Resolved spectroscopic binaries are unique among other types of binaries. They provide the only possibility (aside from trigonometric parallaxes) to accurately determine distances to objects, which is one of the most important characteristics in astronomy. Such binaries are not numerous, but an exhaustive catalog of them still does not exist. The …
A sign in space: An interdisciplinary exploration of the potential reception of an extraterrestrial signal
Ferri, Paolo; de Paulis, Daniela; Shostak, Seth +5 more
A Sign in Space is an interdisciplinary project by media artist Daniela de Paulis, in collaboration with the Green Bank Observatory, the National Institute for Astrophysics, the SETI Institute and the European Space Agency.
The project consists in transmitting a simulated extraterrestrial message as part of a live performance, using an ESA sp…Globular Cluster UVIT Legacy Survey (GlobULeS) - II. Evolutionary status of hot stars in M3 and M13
Pradhan, Ananta C.; Sahu, Snehalata; Subramaniam, Annapurni +4 more
We present a far-ultraviolet (FUV) study of hot stellar populations in the second parameter pair globular clusters (GCs) M3 and M13, as a part of the GC UVIT Legacy Survey programme (GlobULeS). We use observations made with F148W and F169M filters of the Ultraviolet Imaging Telescope (UVIT) onboard AstroSat along with ground-based data (UBVRI filt…
Energization of Cold Protons and Helium Ions by EMIC Waves in the Inner Magnetosphere: Hybrid Simulations
Lee, Ensang; Min, Kyungguk; Kwon, Jong-Woo +3 more
Electromagnetic ion cyclotron (EMIC) waves generated by hot anisotropic (T⊥ > T∥) protons (∼10-100 keV), play an important role in accelerating cold (<1 eV) protons (H+) and helium (He+) ions in the magnetosphere. Using a hybrid code with parameters found in the inner magnetosphere, we examine when…
Multipoint Cluster Observations of Kinetic Alfvén Waves, Electron Energization, and O+ Ion Outflow Response in the Mid-Altitude Cusp Associated With Solar Wind Pressure and/or IMF BZ Variations
Chaston, Christopher C.; Hull, Arthur J.; Damiano, Peter A.
We report the properties of low frequency (LF) electromagnetic fluctuations (≤11 Hz) in relation to input electron and ion outflow response observed by Cluster in the mid-altitude cusp during high solar wind dynamic pressure PSW and active magnetospheric conditions (Kp = 4+). The multipoint observations reveal the dynamic int…
The variable stars in the field of NGC 6139: a critical approach to their reddening and membership
Arellano Ferro, A.; Luna, A.; Yepez, M. A. +1 more
We present a CCD VI time-series analysis of the globular cluster NGC 6139 and its variable star population. Using the astrometric data available in Gaia-DR3, we performed a membership analysis that enabled the construction of a clean colour-magnitude diagram (CMD). Variable stars in the field of the cluster reported by Gaia-DR3 and newly discovere…
Analysis of the first coronagraphic multi-band observations of a sungrazing comet
Heinzel, P.; Sasso, C.; Romoli, M. +35 more
Context. Between 24 and 25 December 2021 a sungrazing comet (SOHO-4341) approached the Sun, being observed by "classical" visible light (VL) coronagraphs on board the SOHO and STEREO missions, and also by the innovative Metis coronagraph on board the ESA-NASA Solar Orbiter mission in the VL and ultraviolet (UV H I Lyman-α) band.
Aims: We show…