Search Publications

Quasars in the Galactic Anti-Center Area from LAMOST DR3

Zhang, Yong; Yuan, Hai-Bo; Huang, Yang +11 more

We present a sample of quasars discovered in an area near the Galactic Anti-Center covering 150^\circ ≤ l≤ 210^\circ and | b| ≤ 30^\circ , based on LAMOST Data Release 3 (DR3). This sample contains 151 spectroscopically confirmed quasars. Among them 80 are newly discovered with LAMOST. All these quasars are very bright, with i magnitudes peaking a…

An application of the KNND method for detecting nearby open clusters based on Gaia-DR1

Gao, Xin-Hua

This paper presents a preliminary test of the k-th nearest neighbor distance (KNND) method for detecting nearby open clusters based on Gaia-DR1. We select 38 386 nearby stars (< 100 {pc}) from the Gaia-DR1 catalog, and then use the KNND method to detect overdense regions in three-dimensional space. We find two overdense regions (the Hyades and …

V2551 Cyg: a pulsating star with enigmatic peculiarities

Popov, Velimir A.; Petrov, Nikola I.; Kjurkchieva, Diana P. +2 more

Intensive photometric and spectral observations of the variable star V2551 Cyg are presented. The light curve shape reveals that the target is a pulsating star, contrary to its previous classification as an eclipsing binary. The period and amplitude of the light curve, the amplitudes of color changes and the radial velocity curve of V2551 Cyg are …

An improved solution to geometric distortion using an orthogonal method

Wang, Na; Peng, Huan-Wen; Peng, Qing-Yu

The geometric distortion of a CCD field of view has a direct influence on the positional measurements of CCD observations. In order to obtain high precision astrometric results, the geometric distortion should be derived and corrected precisely. As presented in our previous work, a convenient solution has been carried out and has also been applied…