Search Publications
Study of Central Intensity Ratio of Seyfert Galaxies in Nearby Universe
Ravikumar, C. D.; Aswathy, S.; Vinod, K. T. +1 more
We use the recently discovered simple photometric parameter Central Intensity Ratio (CIR) determined for a sample of 57 nearby (z < 0.02) Seyfert galaxies to explore the central features of galaxies and their possible connection with galaxy evolution. The sample of galaxies shows strong anti-correlation between CIR and mass of their central sup…
Optical and X-Ray Studies of Marginal Contact Binary RW Dor Using TESS and XMM-Newton Observatories
Sriram, K.; Mamatha Rani, G.
Marginal short-period contact binaries are important to understand as they pose a different physical scenario than the predicted theoretical model based on the thermal relaxation oscillation mechanism due to their shallow degree of contact. Here we present the optical and X-ray studies of a contact binary source RW Dor using the Transiting Exoplan…
The Significance of Thermally Pulsing Asymptotic Giant Branch Stars in Post-starburst Galaxies
Luo, A. -Li; Liu, Siqi
We measure the significance of thermally pulsing asymptotic giant branch (TP-AGB) stars via the spectral energy distributions (SEDs) of a sample of post-starburst (PSB) galaxies at z = 0.2-0.7. Using ground- and space-based photometry from the 3D-HST catalog, as well as associated near-infrared (NIR) Hubble Space Telescope (HST) slitless grism spe…
Six Newly Discovered Eclipsing Binary Systems in the TESS field
Ulaş, Burak; Ayan, Vildan
We present the first detailed investigation of six eclipsing binary systems in the TESS field. The TESS light curves of the targets are analyzed by determining the initial effective temperatures via SED fits. The absolute parameters are derived and the systems are compared to well-known binaries of the same type. Results show that CD-58791, CD-621…
Large-scale CO (J = 1-0) Observations toward the M120.1+3.0 Molecular Cloud: A Filament with a Chain of Starburst Clusters
Fang, Min; Zhang, Shiyu; Su, Yang +11 more
We present large-scale (2° × 2°) observations toward the molecular cloud M120.1+3.0, using 12CO, 13CO and C18O (J = 1 - 0) data from the Purple Mountain Observatory 13.7 m millimeter telescope. The distance of the cloud is measured to be ~1.1 kpc. Using the 13CO data, we identify a main filament F1 and t…
Astrometric Reduction of Saturnian Satellites with Cassini-ISS Images Degraded by Trailed Stars
Li, Yan; Zhang, Qing-Feng; Liu, Meng-Qi +4 more
The Imaging Science Subsystem (ISS) mounted on the Cassini spacecraft has taken a lot of images, which provides an important source of high-precision astrometry of some planets and satellites. However, some of these images are degraded by trailed stars. Previously, these degraded images cannot be used for astrometry. In this paper, a new method is…
The Environment and Star Formation around the Infrared Bubble N 13
Xu, Ye; Zhou, Dong-Dong; Zhou, Jian-Jun +2 more
Infrared bubbles provide a unique opportunity to study the interactions between massive stars and surrounding material. We conduct a multi-wavelength study on the environment and star formation around an infrared bubble N 13. Three dust clumps and two molecular clumps are identified around N 13, which are all distributed on the layer. Young stella…
Determination of Distance, Extinction, Mass, and Age for Stars in LAMOST DR7
Huang, Yang; Yuan, Haibo; Wang, Jianling +1 more
Large scale spectroscopic surveys such as that using Large-sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) have collected spectra of millions stars in the Milky Way. Utilizing this huge sample of stars to study the assembling history and structure of our Galaxy requires accurate estimates of distance, extinction, age, and mass for ind…
X-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSat
Banerjee, D.; Kuznetsov, A. A.; Chandrashekhar, K. +1 more
We present observations of the active M-dwarf binary AT Mic (dM4.5e+dM4.5e) obtained with the orbital observatory AstroSat. During 20 ks of observations, in the far-ultraviolet (130-180 nm) and soft X-ray (0.3-7 keV) spectral ranges, we detected both quiescent emission and at least five flares on different components of the binary. The X-ray flare…
An Initial Analysis of a Strongly Lensed QSO Candidate Identified by LAMOST
Chen, Y. H.; Tang, M. Y.; Tu, H. +1 more
From 2011 to 2021, LAMOST has released a total of 76,167 quasar data. We try to search for gravitationally lensed QSOs by limiting coordinate differences and redshift differences of these QSOs. The name, brightness, spectrum, photometry and other information of each QSO will be visually checked carefully. Special attention should be paid to check …