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A Multiwavelength Classification and Study of Red Supergiant Candidates in NGC 6946
Williams, Benjamin F.; Dolphin, Andrew; Girardi, Léo +3 more
We have combined resolved stellar photometry from Hubble Space Telescope (HST), Spitzer, and Gaia to identify red supergiant (RSG) candidates in NGC 6946, based on their colors, proper motions, visual morphologies, and spectral energy distributions. We start with a large sample of 17,865 RSG candidates based solely on HST near-infrared photometry.…
Study of the exosphere of Mercury with the PHEBUS spectrograph on the BepiColombo mission
Robidel, Rozenn
Mercury is the least explored of the inner planets, only three spacecraft have explored it. Mariner 10 observed the planet during three close encounters in 1974 and 1975, unveiling a very thin atmosphere surrounding the planet, somewhat similar to that of the Moon, including hydrogen (H) and helium (He). Sodium (Na), potassium (K) and calcium (Ca)…
The ability of CSST to determine the orbital solutions of SB1s
Wang, Xiaoli; Fu, Yanning; Chen, Yue +1 more
The single-lined spectroscopic binaries (SB1s) are composed of two components with large difference in masses and in physical properties. The orbital and physical parameters of a large number of such binary systems are unknown due to lack of necessary observations. Compared with SB2s, SB1s can provide much more stringent constraint to stellar evol…
Investigating the magnetic field of the quiet Sun internetwork
Ichimoto, Kiyoshi; Deng, Yuanyong; Shaltout, Abdelrazek M. K. +1 more
We analyze the magnetism of the quiet Sun internetwork (IN) using high-spatial-resolution data obtained by the spectropolarimeter (SP) of the Solar Optical Telescope aboard the Hinode satellite near the disk center of the Sun. The SP data were inverted using the Stokes Inversion based on Response functions (SIR) inversion code with a single-compon…
Peaks, notches, and lowlands of comet (67P) Churyumov-Gerasimenko
Burov, A. A.; Guerman, A. D.; Nikonov, V. I.
We study here the local minima, maxima, and saddle points of the augmented potential on the surface of a small celestial body with application to comet (67P) Churyumov-Gerasimenko. The isolines of the augmented potential on this surface are determined, in particular, those corresponding to the saddle points. The results are applied to reveal the c…
FAST Search for Circumstellar Atomic Hydrogen. II. Is BD+30°3639 an Interacting Planetary Nebula?
Zhang, Yong; Zhang, Chuan-Peng; Parker, Quentin A. +3 more
The young, compact, very high surface brightness but low excitation planetary nebula (PN) BD+30°3639 is one of the very few PNe that have been reported to exhibit the 21 cm H I emission line. As part of a long-term program to search for circumstellar atomic hydrogen, we observed the 21 cm feature toward BD+30°3639 with the Five-hundred-meter Apert…
Overcoming separation between counterparts due to unknown proper motions in catalogue cross-matching
Wilson, Tom J.
To perform precise and accurate photometric catalogue cross-matches - assigning counterparts between two separate data sets - we need to describe all possible sources of uncertainty in object position. With ever-increasing time baselines between observations, like 2MASS in 2001 and the next generation of surveys, such as the Vera C. Rubin Observat…
Soft X-Ray Excess from Shocked Black Hole Accretion
Fukumura, Keigo; Przybylek, Jeff
A certain class of luminous galaxies hosting supermassive black holes (BHs) is known to exhibit an excess of "soft X-rays" in their X-ray spectra. However, its physical identity and origin are yet to be understood. In this work, we systematically study a sample of 9 well-documented narrow-line Seyfert 1 active galactic nuclei by utilizing the arch…
Multipoint Observations of the Dynamics at an ICME Sheath-Ejecta Boundary
Pulkkinen, Tuija I.; Kilpua, Emilia K. J.; Good, Simon W. +3 more
The radial evolution of interplanetary coronal mass ejections (ICMEs) is dependent on their interaction with the ambient medium, which causes ICME erosion and affects their geoefficiency. Here, an ICME front boundary, which separates the confined ejecta from the mixed, interacted sheath-ejecta plasma upstream, is analyzed in a multipoint study exa…
Kinematic structure of the stellar population of the solar neighborhood by Gaia DR3
Vereshchagin, S. V.; Chupina, N. V.; Postnikova, E. S. +1 more
The data of modern catalogs allow us to consider in detail the issue of the spatial velocity distribution. The stars in the solar vicinity make it possible to avoid errors and draw detailed conclusions about their kinematics. For a corrected study, we took a sample of stars from the Gaia DR3 within 300 pc. This area contains a number of star clust…