Search Publications
Missions
Journals
Publication Years
The central star of planetary nebula PHR 1315 - 6555 and its host Galactic open cluster AL 1
Lykou, F.; Zijlstra, A.; Parker, Q. A. +2 more
PHR 1315 - 6555 is a rare case of a Galactic planetary nebula that is a proven member of the open cluster AL 1. This membership allows its distance to be defined with precision, and thus accurate measurements of its physical characteristics along with the parameters of its central star (CS) can be obtained. In this work, we use the Hubble Space Te…
Evidence for color dichotomy in the primordial Neptunian Trojan population
Smith, M.; D'Andrea, C. B.; Abbott, T. M. C. +45 more
In the current model of early Solar System evolution, the stable members of the Jovian and Neptunian Trojan populations were captured into resonance from the leftover reservoir of planetesimals during the outward migration of the giant planets. As a result, both Jovian and Neptunian Trojans share a common origin with the primordial disk population…
Physical Properties of the Close-in Tertiary in the Southern Triple-lined System VZ Lib
Qian, S. -B.; Liao, W. -P.; Sarotsakulchai, T.
VZ Lib is a southern triple-lined system. By analyzing all available times of light minima, orbital period changes are revisited in detail. We discovered that the observed-calculated (O - C) curve shows a long-term period decrease at a rate of {dP}/{dt}=-2.25× {10}-7 {days yr}}-1, revealing a mass transfer from the more massi…
Multi-epoch X-ray spectral analysis of the narrow-line Seyfert 1 galaxy Mrk 478
Gallo, L. C.; Zoghbi, A.; Gonzalez, A. G. +2 more
A multi-epoch X-ray spectral and variability analysis is conducted for the narrow-line Seyfert 1 (NLS1) active galactic nucleus (AGN) Mrk 478. All available X-ray data from XMM-Newton and Suzaku satellites, spanning from 2001 to 2017, are modelled with a variety of physical models, including partial covering, soft Comptonization, and blurred refle…
Spectral Diagnosis of Mg II and Hα Lines during the Initial Stage of an M6.5 Solar Flare
Xu, Yan; Jing, Ju; Wang, Haimin +2 more
Recent studies have shown special spectral properties during the initial stage of flare emissions, such as the enhanced absorption in He I 10830 Å line and a strong redshift in Hα. Using the high-resolution imaging spectroscopic data obtained by the Interface Region Imaging Spectrograph (IRIS), we investigate the Mg II emission lines during an M6.…
On the Oosterhoff dichotomy in the Galactic bulge - II. Kinematical distribution
Smolec, R.; Grebel, E. K.; Catelan, M. +3 more
We present a kinematical study of RR Lyrae stars associated with two Oosterhoff groups in the Galactic bulge. We used data published in the first paper of the series, plus proper motions from the Gaia Data Release 2, and radial velocities from the literature. A 6D kinematical and spatial solution was obtained for 429 RR Lyrae stars. We use a model…
First MMS Observation of Energetic Particles Trapped in High-Latitude Magnetic Field Depressions
Fuselier, Stephen A.; Nykyri, Katariina; Ma, Xuanye +2 more
We present a case study of the Magnetospheric Multiscale (MMS) observations of the Southern Hemispheric dayside magnetospheric boundaries under southward interplanetary magnetic field direction with strong By component. During this event MMS encountered several magnetic field depressions characterized by enhanced plasma beta and high fl…
Compton-thick AGN in the NuSTAR Era. IV. A Deep NuSTAR and XMM-Newton View of the Candidate Compton-thick AGN in ESO 116-G018
Ajello, M.; Marchesi, S.; Zhao, X.
We present a 2-78 keV spectral analysis of the deep NuSTAR and XMM-Newton observation of a nearby Seyfert 2 galaxy, ESO 116-G018, which is selected as a candidate Compton-thick (CT) active galactic nucleus (AGN) based on a previous Chandra-Swift-BAT study. Through our analysis, the source is, for the first time, confirmed to be a CT AGN at a >3…
The Blueshift of the C IV Broad Emission Line in QSOs
Bian, Wei-Hao; Ge, Xue; Zhao, Bi-Xuan +1 more
For the sample from Ge et al. of 87 low-z Palomar-Green quasi-stellar objects (QSOs) and 130 high-z QSOs (0 < z < 5) with {{H}}β -based single-epoch supermassive black hole masses, we perform a uniform decomposition of the C IV λ1549 broad-line profile. Based on the rest frame defined by the [O III] λ5007 narrow emission line, a medium-stron…
Space astrometry of the very massive ∼150 M⊙ candidate runaway star VFTS682
Lennon, D. J.; Renzo, M.; Platais, I. +12 more
How very massive stars form is still an open question in astrophysics. VFTS682 is among the most massive stars known, with an inferred initial mass of ≳150 M_⊙. It is located in 30 Doradus at a projected distance of 29 pc from the central cluster R136. Its apparent isolation led to two hypotheses: either it formed in relative isolation or it was e…