Jing Yao Hu

Chinese Academy of Sciences | CAS

We here report the photometric performance of Lunar-based Ultraviolet telescope (LUT), the first robotic telescope working on the Moon, for its 18-months operation. In total, 17 IUE standards have been observed in 51 runs until June 2015, which returns a highly stable photometric performance during the past 18 months (i.e., no evolution of photomet...

We reported the photometric calibration of Lunar-based Ultraviolet telescope (LUT), the first robotic astronomical telescope working on the lunar surface, for its first six months of operation on the lunar surface. Two spectral datasets (set A and B) from near-ultraviolet (NUV) to optical band were constructed for 44 International Ultraviolet Explo...

We propose a Bayesian method to measure the total Galactic extinction parameters, $R_V$ and $A_V$. Validation tests based on the simulated data indicate that the method can achieve the accuracy of around 0.01\,mag. We apply this method to the SDSS BHB stars in the northern Galactic cap and find that the derived extinctions are highly consistent wit...

Aims: We used 12 530 photometrically-selected blue horizontal branch (BHB) stars from the Sloan Digital Sky Survey (SDSS) to estimate the total extinction of the Milky Way at the high Galactic latitudes, RV and AV in each line of sight. Methods: A Bayesian method was developed to estimate the reddening values in the given lines of sight. Based on t...

Tsinghua-NAOC (National Astronomical Observatories of China) Telescope (hereafter, TNT) is an 80-cm Cassegrain reflecting telescope located at Xinglong bservatory of NAOC, with main scientific goals of monitoring various transients in the universe such as supernovae, gamma-ray bursts, novae, variable stars, and active galactic nuclei. We present in...

A simple method was developed to determine the residues of glyphosate, N-(phosphonomethyl)glycine, in soil. The residues were extracted from soil matrices with 2 M NH4OH, derivatized by trifluoroacetic anhydride and trifluoroethanol, and, then, determined by gas chromatography with a nitrogen-phosphorus detector (GC-NPD). The results were further c...

We study the spectroscopic properties of a large sample of Low Surface Brightness galaxies (LSBGs) (with B-band central surface brightness mu0(B)>22 mag arcsec^(-2)) selected from the Sloan Digital Sky Survey Data Release 4 (SDSS-DR4) main galaxy sample. A large sample of disk-dominated High Surface Brightness galaxies (HSBGs, with mu0(B)<22 mag ar...

We present our optical observations of {\em Swift} GRB 070518 afterglow obtained at the 0.8-m Tsinghua University-National Astronomical Observatory of China telescope (TNT) at Xinglong Observatory. Our follow-up observations were performed from 512 sec after the burst trigger. With the upper limit of redshift $\sim$0.7, GRB 070518 is found to be an...

Astronomical photometry is employed to study reflection optical characteristics of geosynchronous earth orbit (GEO) satellites. Unresolved observations for the 3-axis stabilization GEO sample are carried out in visual band, and flux calibration is made with astronomical standard stars. Data were reduced and analyzed by using standard astronomical i...

A large sample of low surface brightness (LSB) disk galaxies is selected from SDSS with B-band central surface brightness mu_0(B) from 22 to 24.5 mag arcsec^(-2). Some of their properties are studied, such as magnitudes, surface brightness, scalelengths, colors, metallicities, stellar populations, stellar masses and multiwavelength SEDs from UV to...

We present the SVOM (Space-based multi-band astronomical Variable Object Monitor) mission, that is being developed in cooperation between the Chinese National Space Agency (CNSA), the Chinese Academy of Science (CAS) and the French Space Agency (CNES). Its scientific objectives include the study of the GRB phenomenon, GRB physics and progenitors, c...

A gamma-ray burst (GRB) optical photometric follow-up system at the Xinglong Observatory of National Astronomical Observatories of China (NAOC) has been constructed. It uses the 0.8-m Tsinghua-NAOC Telescope (TNT) and the 1-m EST telescope, and can automatically respond to GRB Coordinates Network (GCN)alerts. Both telescopes slew relatively fast, b...

The Beijing Astronomical Observatory (BAO) 0.6 m telescope has been used for nearby supernova survey in more than 3000 fields, covering a total area of 235 deg2. More than 260000 CCD images have been collected since April 1996, with 45 supernovae discovered. We searched for variables in about 90000 images taken during 1996–1998. For the fields in w...

IRAS 04000+5052 appears to be a single, somewhat extended red source on optical CCD images. From our infrared imaging observations, an infrared cluster consisting of 15 objects is discovered in this region. In this paper, by discussing and analyzing the observational results of near-infrared imaging, optical spectroscopy, and the 12CO molecular lin...

We report on the detection of an extreme flarelike event on DF Tauri during a spectroscopic monitoring program of some classical T Tauri stars known to show hot spots on their surfaces. These observations were performed on a nightly basis within roughly one rotational period of DF Tau between 2000 January 7 and 14. The estimated amplitude of variat...

We present the properties of a large sample (12 282) of nearly face-on low surface brightness (LSB) disc galaxies selected from the main galaxy sample of SDSS-DR4. These properties include B-band central surface brightness μ0(B), scalelengths h, integrated magnitudes, colours and distances D. This sample has μ0(B) values from 22 to 24.5 mag arcsec−...

Optical observations of high apogee space debris is currently one of active research topics in the domain of space debris. This strong interest is driven by a wide spectrum of promising applications in many area such as space object detecting, tracking, and identification etc. Four major methods in the physical characteristics of high apogee space...

We present new Galactic substructure results from SEGUE spectroscopy of A and F stars in the Galactic spheroid and the Monoceros stream in the Galactic plane. We present evidence that there is significant substructure in the velocities of the spheroid stars in every direction that we probe, and that many more observations of stars are required to d...

We serendipitously find a new nearby Low Surface Brightness (LSB) galaxy from SDSS database. We estimate oxygen abundance of its H II region SDSS J121811.0+465501.2 from electron temperature, as well as for another H II region, SDSS J135440.5+535309.6, located in irregular LSB galaxy UGC 8837. These two extragalactic H II regions were classified as...

The halo structure at high Galactic latitudes near both the north and south poles is studied using Sloan Digital Sky Survey (SDSS) and SuperCOSMOS data. For the south cap halo, the archive of the SuperCOSMOS photographic photometry sky survey is used. The coincident source rate between SuperCOSMOS data in BJ band from 16.5 to 20.5 mag and SDSS data...

Sloan Digital Sky Survey (SDSS) DR5 photometric data with $120^{\circ} < \alpha < 270^{\circ}$, $25^{\circ} < \delta < 70^{\circ}$ are searched for new Milky Way companions or substructures in the Galactic halo. Five candidates are identified as overdensities of faint stellar sources that have color-magnitude diagrams similar to those of known glob...

Context. The iron abundance of halo RR Lyrae stars can provide important information about the formation history of the Galactic halo. Aims. We determine the (Fe/H) of the sample of halo RRab stars by using the P-ϕ31-(Fe/H) relation developed by Jurcsik & Kovacs based on their light curves. We need to extend the relation from the V band to our unfi...

Using the stellar photometry catalogue based on the latest data release (DR4) of the Sloan Digital Sky Survey (SDSS), a study of the Galactic structure using star counts is carried out for selected areas of the sky. The sample areas are selected along a circle at a Galactic latitude of +60°, and 10 strips of high Galactic latitude along different l...

We present unfiltered CCD photometry of a sample of 71 candidate RR Lyrae stars during 2003 and 2004, out of 148 candidate stars that were selected from Sloan Digital Sky Survey (SDSS) commissioning data by Ivezi and co-workers. We obtain light curves of 69 candidate stars and present a catalog of their positions, amplitudes, periods, types, and me...

In 2004, we established a Japan-Taiwan-China collaboration for GRB study in the East-Asian region. This serves as a valuable addition to the world-wide optical and infrared follow-up network, because the East-Asia region would otherwise be blank. We have been carrying out imaging and spectroscopic follow-up observations at Lulin (Taiwan), Kiso (Jap...

We have developed an empirical and effective set of criteria, based on the 2MASS colors, to select candidate classical T Tauri stars (CTTS). This provides a useful tool to study the young stellar population in star-forming regions. Here we present our analysis of the bright-rimmed clouds (BRCs) B 35, B 30, IC 2118, LDN 1616, LDN 1634, and Orion Eas...

The scientific importance and possibility for study of the Galactic structure using the LAMOST are discussed in this paper. The LAMOST/GALAXY project is practically proposed.

IAUC 8062 available at Central Bureau for Astronomical Telegrams.

IAUC 8025 available at Central Bureau for Astronomical Telegrams.

IRAS 01005+7910 is a cold IRAS source. We present its optical identification, photometric and spectroscopic observation results. Its optical counterpart is classified as a B2Ie star with V magnitude 10.85. Its Halpha line shows the P Cygni profile. According to its location in the Galaxy (b=16.6), we consider it to be a post-AGB star or a proto-pla...

IAUC 7861 available at Central Bureau for Astronomical Telegrams.

1RXS J232953.9+062814 was identified as a cataclysmic variable by Wei et al. (1999). Four low-resolution spectra of 1RXS J232953.9+062814 were obtained by using the 2.16-m telescope of the National Astronomical Observatories, in which two of them were at outburst, and the other two were at quiescence. The system is about 16.8 B and 16.5 V at quiesc...

IAUC 7786 available at Central Bureau for Astronomical Telegrams.

IAUC 7782 available at Central Bureau for Astronomical Telegrams.

IAUC 7753 available at Central Bureau for Astronomical Telegrams.

87 stars in the NGC 6913 field with both UBV and Vilnius photometry are selected to be the sample. The membership probability of the stars is greater than 50%. The correlation among Vilnius photometry, UBV photometry and reddening in the cluster is reviewed. It is found that the photometry in the Vilnius X, Y and Z bands can be used to make rough s...

IAUC 7591 available at Central Bureau for Astronomical Telegrams.

High-resolution and high signal-to-noise ratio spectra of Comet C/1995 O1 (Hale-Bopp), which provided continuous wavelength coverage from 5500 Å to 8500 Å and partial coverage from 4000 Å to 5500 Å, were obtained with the Coudé Echelle Spectrograph at Beijing Astronomical Observatory on March 26, 28 and April 22, 1997. In the spectra we found 532 e...

IAUC 7596 available at Central Bureau for Astronomical Telegrams.

For investigating the statistical properties of X-ray selected Active Galactic Nuclei (AGNs), we have carried out a program of optical identification of a selection of X-ray sources from ROSAT All Sky Survey Bright Source Catalogue (RASS-BSC) using the 2.16 m telescope of Beijing Astronomical Observatory (BAO). In the preliminary observations, 23 n...

IAUC 7581 available at Central Bureau for Astronomical Telegrams.

Planetary nebulae represent the end product of the evolution of low mass stars with M < 8 M ⊙ . The central stars have masses between 0.55 and 0.85 M ⊙ . This means a large amount of material must have been distributed in the interiors of the PNe. The observed variations of the chemical compositions and mass distributions therefore carry important...

We observed the Leonid meteor storm in 1998 and 1999. The light curves extracted from the 2-dimensional images of the bright Leonid meteors clearly show the sub-structures, which are consistent with the generally accepted dustball meteor model (Hawkes & Jones, 1975).

File table3 contains all of the emission lines found in spectra of Comet C/1995 O1 (Hale-Bopp) and their identifications. (1 data file).