Search Publications
Research Developments in Li-Paczyński Novae (II): Observational Aspect
Wang, Shan-qin; Dai, Zi-gao; Wu, Xue-feng
Since the LP-Nova models were proposed, and the short gamma-ray burst (SGRB) afterglows were confirmed, people have actively made searches for the evidence of the existence of LP-Novae among the optical (or near-infrared) counterparts of SGRBs. In this paper, we first summarize these observational progresses before 2012 in Section 2. In Section 3 …
Morphological Classification of High-redshift Massive Galaxies in the COSMOS/UltraVISTA Field
Kong, Xu; Fang, Guan-wen; Ma, Zhong-yang
Utilizing the multi-band photometric data of the COSMOS (Cosmic Evolution Survey)/UltraVISTA (Ultra-deep Visible and Infrared Survey Telescope for Astronomy) field and the high-resolution HST WFC3 (Hubble Space Telescope Wide Field Camera 3) near-infrared images in the CANDELS (Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey) field,…
Morphology and Structure of Ultraluminous Infrared Galaxies at z ∼ 2 in the EGS Field
Kong, Xu; Chen, Yang; Fang, Guan-Wen +1 more
Using the high-resolution F160W images observed by the HST WFC3 (Hubble Space Telescope Wide Field Camera 3) in the CANDELS-EGS (Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey-Extended Groth Strip) field, we have studied the morphological and structural features of 9 ultraluminous infrared galaxies (ULIRGs) at z ∼ 2. We find a wide…
Hunting for Long-lived Protoplanetary Disks Observed with AKARI/FIS
Liu, Yao; Liu, Qiong
Twenty-one YSO (Young Stellar Object) candidates nearby the solar system have been identified through cross-correlating Hipparcos (High Precision Parallax Collecting Satellite) catalog with the AKARI/FIS YSO catalog, and the reliability is over 90%. The central objects cover the spectral types from B to M. The Hipparcos's accurate measurements of …
A Research on the Evolution of Star Formation Activities of Early-type Galaxies
Zheng, Xian-Zhong; Wang, Fang
The observational investigation of the evolution of the star formation activities of early-type galaxies (ETGs) with redshifts helps us to understand the formation and evolution of this kind of galaxies. Combined with the highresolution images from HST/ACS (Hubble Space Telescope/Advanded Camera for Surveys) of the GEMS (Galaxy Evolution fromMorph…
A Kinematical Study of the Galaxy Based on the Revised Hipparcos Astrometric Data
Shen, Ming; Zhang, Hong
On the basis of the revised Hipparcos data recently released, the zero-point of the period-luminosity relation for classical cepheids is reexamined. Fitting the proper motion and radial velocity data via an axisymmetric model, the Oort constants and circular rotation velocity of the LSR are calculated to obtain the Galactocentric distance of the S…
A Study of the Scale Height of the Thin Galactic Disk in the Solar Neighborhood
Zhu, Zi; Kong, Da-Li
An attempt is made to determine the scale height of the thin Galactic disk in the solar neighborhood using various stellar samples from the accurate astrometric data of the Hipparcos satellite. Using the Tycho color indices and considering the completeness of the samples, several samples were selected from the main sequence and the horizontal bran…
A Method to Improve Binary Orbits by Incorporating Long-term Observational Data
Ren, Shu-lin; Fu, Yan-ning
Early ground-based observations have accumulated a large volume of data on binary stellar systems. Compared to the more recent data obtained by various new techniques, these older data have both the disadvantage of low precision and the advantage of long time-span. For long-period binary systems having available both long-term data and Hipparcos d…
Precession Constant Correction and Proper Motion Systems of FK5 and Hipparcos
Zhu, Zi
Results of many researches have shown that the relation between the proper motion systems of FK5 and Hipparcos is not consistent with the precession constant corrections determined by VLBI and LLR. We analysed proper motion data of PPM and ACRS based on the FK5 system for many different sub-samples and found that consistent values of the precessio…
Near-infrared photometry of 20 hipparcos carbon stars
Chen, Pei-Sheng; Yang, Xiao-Hong; Wang, Xun-Hao
Near-infrared JHK photometry was carried out for 20 carbon stars observed by the satellite Hipparcos. From the observations, bolometric corrections in the K band ( BCK), apparent bolometric magnitudes ( mrmbo) and effective temperatures ( Te) of these stars were estimated. Combined with the trigonometric parallaxes…