Search Publications
Superpenumbral chromospheric flare
Srivastava, Abhishek K.; Liu, Suo; Zhang, Hong-Qi +2 more
We observed a C-class flare at the outer boundary of the superpenumbra of a sunspot. The flare was triggered by an emerging magnetic bipolar region that was obliquely oriented with respect to the superpenumbral fibrils. The flare started due to the low height magnetic reconnection of emerging magnetic flux with a superpenumbral field resulting in …
Gas compression and likely triggered star formation in the infrared bubble N107
Yuan, Jing-Hua; Li, Jin-Zeng; Ren, Zhi-Yuan +2 more
The expansion of HII regions can regulate the evolution of their natal clouds and the star formation therein. Infrared dust bubbles, which are frequently associated with HII regions, are ideal laboratories to test whether impulse(s) driven by the expanding bubbles enhances or suppresses star-formation. In this work, we present a comprehensive stud…
Matching CCD images to a stellar catalog using locality-sensitive hashing
Liu, Bo; Peng, Qing-Yu; Yu, Jia-Zong
The usage of a subset of observed stars in a CCD image to find their corresponding matched stars in a stellar catalog is an important issue in astronomical research. Subgraph isomorphic-based algorithms are the most widely used methods in star catalog matching. When more subgraph features are provided, the CCD images are recognized better. However…
Spectroscopic and photometric studies of a candidate pulsating star in an eclipsing binary: V948 Her
Kahraman Aliçavuş, Filiz
Eclipsing binary stars with a pulsating component are powerful tools that allow us to probe the stellar interior structure and the evolutionary statuses with a good accuracy. Therefore, in this study, spectroscopic and photometric examinations of an eclipsing binary system V948 Her are presented. The primary component of the system is classified t…
The NGC 7742 star cluster luminosity function: a population analysis revisited
de Grijs, Richard; Ma, Chao
We re-examine the properties of the star cluster population in the circumnuclear starburst ring in the face-on spiral galaxy NGC 7742, whose young cluster mass function has been reported to exhibit significant deviations from the canonical power law. We base our reassessment on the clusters’ luminosities (an observational quantity) rather than the…
Probing the solar transition region: current status and future perspectives
Tian, Hui
The solar transition region (TR) is the temperature regime from roughly 0.02 MK to 0.8 MK in the solar atmosphere. It is the transition layer from the collisional and partially ionized chromosphere to the collisionless and fully ionized corona. The TR plays an important role in the mass and energy transport in both the quiet solar atmosphere and s…
Powerful CMD: a tool for color-magnitude diagram studies
Fan, Zhou; Chen, Li; Li, Zhong-Mu +5 more
We present a new tool for color-magnitude diagram (CMD) studies, Powerful CMD. This tool is built based on the advanced stellar population synthesis (ASPS) model, in which single stars, binary stars, rotating stars and star formation history have been taken into account. Via Powerful CMD, the distance modulus, color excess, metallicity, age, binar…
Surface thermophysical properties on the potentially hazardous asteroid (99942) Apophis
Ip, Wing-Huen; Yu, Liang-Liang; Ji, Jianghui
We investigate the surface thermophysical properties (thermal emissivity, thermal inertia, roughness fraction and geometric albedo) of asteroid (99942) Apophis, using the currently available mid-infrared observations from CanariCam on Gran Telescopio CANARIAS and far-infrared data from PACS on Herschel, based on the Advanced Thermophysical Model. …
Searching for initial stage of massive star formation around the H II region G18.2-0.3
Zhang, Chuan-Peng; Wang, Jun-Jie; Yuan, Jing-Hua +6 more
Sometimes, early star formation can be found in cold and dense molecular clouds, such as an infrared dark cloud. Considering that star formation often occurs in clusters, H II regions may be triggering a new generation of star formation, so we can search for the initial stage of massive star formation around H II regions. Based on the above, this …
How to co-add images? I. A new iterative method for image reconstruction of dithered observations
Wang, Lei; Li, Guo-Liang
By employing the previous Voronoi approach and replacing its nearest neighbor approximation with Drizzle in iterative signal extraction, we develop a fast iterative Drizzle algorithm, named fiDrizzle, to reconstruct the underlying band-limited image from undersampled dithered frames. Compared with the existing iDrizzle, the new algorithm improves …