Search Publications
Missions
Journals
Publication Years
Extended view on the dust shells around two carbon stars
Groenewegen, M. A. T.; Kerschbaum, F.; Aringer, B. +4 more
Context. Stars on the asymptotic giant branch lose considerable amounts of matter through their dust-driven stellar winds. A number of such sources have been imaged by Herschel/PACS, revealing a diverse sample of different morphological types. Among them are a few examples which show geometrically thin, spherically symmetric shells which can be us…
Infrared interferometric imaging of the compact dust disk around the AGB star HR3126 with the bipolar Toby Jug Nebula
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +1 more
Aims: The asymptotic giant branch (AGB) star HR3126, associated with the arcminute-scale bipolar Toby Jug Nebula, provides a rare opportunity to study the emergence of bipolar structures at the end of the AGB phase. Our goal is to image the central region of HR3126 with high spatial resolution.
Methods: We carried out long-baseline inter…
A New Moving Group in the Local Arm
Zhao, Gang; Chen, Yuqin; Zhao, Jingkun +5 more
We present a new moving group clustered in kinematics, spatial position, and elemental abundances. Its spatial position is around the center of the Local Arm of the Milky Way. A convergent point method was taken to select candidate member stars. Among 206 candidate member stars, 74 are pre-main-sequence stars and some of them have stellar disks. W…
Relative Motion in the Hierarchical Triple System ADS48 on the Basis of Gaia DR2 and 26-Inch Refractor of Pulkovo Observatory Data
Zhuchkov, R. Ya.; Kiyaeva, O. V.; Izmailov, I. S.
—According to the exact positions and proper motions of the three components of the star ADS48 from Gaia DR2, their parallax and radial velocities for the epoch 2015.5 the instantaneous relative positions and motions of the components were determined. Only from the Gaia DR2 observations, the family of orbits of the AB pair was calculated by the me…
Combined penalized weights based GM-PHD for point target tracking in starry-sky background
Luo, Qingqing; Gao, Zhisheng; Xie, Chunzhi
It is well known that the point targets observed by the space-based platform are extremely difficult to track due to the interference of a large number of stellar targets and background noise. The traditional GM-PHD, due to its probability accumulation, is easy to mistakenly identify the star as a derived new target when the real target passes clo…
Dissecting the Strong-lensing Galaxy Cluster MS 0440.5+0204. I. The Mass Density Profile
Limousin, Marceau; Carrasco, Eleazar R.; de Diego, José A. +5 more
We present a parametric strong-lensing modeling of the galaxy cluster MS 0440.5+0204 (located at z = 0.19). We have performed a strong-lensing mass reconstruction of the cluster using three different models. The first model uses the image positions of four multiply imaged systems (providing 26 constraints). The second one combines strong-lensing c…
Close eclipsing binary BD And: a triple system
Perdelwitz, V.; Kundra, E.; Guenther, E. +5 more
BD And is a fairly bright (V = 10.8), active and close (P ∼ 0.9258 days) eclipsing binary. The cyclic variability of the apparent orbital period as well as third light in the light curves indicate the presence of an additional late-type component. The principal aim is the spectroscopic testing of the third-body hypothesis and determination of abso…
Pulsation mode switching in the pulsating star HD 81589 and a proposed classification as a field FaRPB star
Martinez, P.; van Heerden, P.; Engelbrecht, C. A.
Extensive multicolour photometry and low-resolution spectroscopy obtained for HD 81589 place the star in the gap between δ Scuti and slowly pulsating B pulsators on the main sequence. A clear episode of pulsation mode switching has apparently occurred in HD 81589, with its primary pulsation frequency switching from 4.57 to 3.71 c d-1 in…
Prospects of Ground-Based and Orbital Studies of Comets and Meteors in the Post-Rosetta Mission Era
Sachkov, M. E.
In this paper, we review the current state and prospects of comet and meteor studies. Special attention is paid to scientific tasks that should be solved with a help of space missions.
The Galactic Aberration and Its Impact on Astronomical Reference Frames
Liu, Jia-cheng; Liu, Niu
The Galactic aberration effect, also known as the secular aberration drift, is a consequence of the centripetal acceleration of the Solar System Barycenter in the circular orbit around the Galactic center. It causes distance-independent apparent proper motions (the amplitude is about 5 µas · yr - 1) for extragalactic sources which…