Search Publications
The structure of the IRAS05168+3634 star-forming region
Nikoghosyan, E. H.; Azatyan, N. M.; Andreasyan, D. H. +1 more
This study aims to determine the main physical parameters (N(H2) hydrogen column density and Td dust temperature) of the Interstellar medium, and their distribution in the extended star-forming region, which includes IRAS 05156+3643, 05162+3639, 05168+3634, 05177+3636, and 05184+3635 sources. We also provide a comparative ana…
Study of the open cluster Alessi-Teutsch 9 (ASCC 10) using multiband photometry and Gaia EDR3
Sánchez, Néstor; López-Martínez, Fátima; Ocando, Sandra +1 more
There is a growing interest in the automated characterization of open clusters using data from the Gaia mission. This work evidences the importance of choosing an appropriate sampling radius (the radius of the circular region around the cluster used to extract the data) and the usefulness of additional multiband photometry in order to achieve accu…
Open clusters identifying by multi-scale density feature learning
Wang, Min; Shao, Zhengyi; Xiang, Yaobing +2 more
Open clusters (OCs) are important objects in exploring the structure and history of the Milky Way. Large amount of sky survey data can be used to detect OCs. However, analyzing these data manually has become a bottleneck of OC identification. This study proposes a multi-scale density feature learning (MSDFL), which includes the open cluster kernel…
GALEX photometry of the open cluster NGC 752
Smith, Graeme H.
Ultraviolet photometry from the GALEX mission is compiled for a sample of main sequence stars and red giants in the open cluster NGC 752. This is one of the few ensembles of coveal near-solar abundance FGK stars for which near-ultraviolet and far-ultraviolet magnitudes are available from GALEX. Cluster members are identified on the basis of Gaia p…
On properties of coronal mass ejection-solar flare linked events
Youssef, M.
In the present paper, the relation between the CMEs and their linked solar flares is examined during the entire solar cycle 23. During this solar cycle and under certain temporal and spatial conditions, 521 CMEs linked with solar flares are selected. These selected CMEs are separated into two groups according to their time of detection, 254 Before…
Thermal and non-thermal X-ray emission from stellar clusters and superbubbles
Kavanagh, Patrick J.
Massive stellar clusters inject significant mass and energy into their surroundings driving superbubbles, 100–1000 pc diameter shells of swept-up interstellar material that contain a hot (
The 21 µm and 30 µm emission features in carbon-rich objects
Volk, Kevin; Sloan, G. C.; Kraemer, Kathleen E.
We review the observational properties and possible carriers of the 21 and 30 µm features seen in the spectra of evolved carbon-rich objects. The 30 µm feature is generally taken to be due to MgS, possibly in combination with other sulfides. It is commonly assumed that the sulfides coat grains of SiC or amorphous carbon, but it remains…
5D memberships and fundamental properties of the old open cluster NGC 6791 based on Gaia
Gao, Xinhua
This paper investigates reliable memberships and fundamental astrophysical properties of the old (∼8 Gyr) open cluster NGC 6791 using the astrometric and photometric data of the Gaia data release 2 (
Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT
Li, Gang; Li, Xiaobo; Tuo, Youli +10 more
Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME), and the Low Energy X-ray telescope (LE). Before the launch, i…
Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions
Melnik, A. M.; Dambis, A. K.
We calculated the median parallaxes for 47 OB associations including at least 10 stars with known Gaia DR2 parallaxes. A comparison between trigonometric and photometric parallaxes of OB associations reveals a zero-point offset of