Ruoyi Zhang
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View article: Recalibration of the Landolt UBVRI Standard Stars and the Generation of 5.4 Million New UBVRI Standard Stars using LAMOST and Gaia
Recalibration of the Landolt UBVRI Standard Stars and the Generation of 5.4 Million New UBVRI Standard Stars using LAMOST and Gaia Open
We present an independent validation and recalibration of the Landolt 2013 (celestial equator and $δ\sim -50^\circ$) and 2016 ($δ\sim -50^\circ$) standard stars in the Johnson $UBV$ and Kron-Cousins $RI$ systems, using tens of thousands of…
View article: Stellar Loci. IX. Estimation of Stellar Parameters from CSST-like Photometry
Stellar Loci. IX. Estimation of Stellar Parameters from CSST-like Photometry Open
The China Space Station Telescope (CSST) will conduct a deep and wide imaging survey in the NUV-, u-, g-, r-, i-, z-, and y-bands. In this work, using theoretical data synthesized from the BOSZ spectra of Bohlin et al. (2017), along with o…
View article: Identification of Galactic H <scp>I</scp> Counterpart of the Large [O <scp>iii</scp>] Emission Structure 1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow> <mml:mo>.</mml:mo> </mml:mrow> <mml:mrow> <mml:mtext>°</mml:mtext> </mml:mrow> </mml:mover> </mml:math> 2 Southeast of M31
Identification of Galactic H <span>I</span> Counterpart of the Large [O <span>iii</span>] Emission Structure 1 2 Southeast of M31 Open
Strottner–Drechsler–Sainty Object 1 (SDSO1) is a faint [O iii ] emission nebula spanning 1 , discovered southeast of M31. In previous surveys, no counterpart has been observed across radio, infrared, UV, and X-ray wavelengths, thus …
View article: A Comprehensive All-sky Catalog of 3345 Molecular Clouds from Three-dimensional Dust Extinction
A Comprehensive All-sky Catalog of 3345 Molecular Clouds from Three-dimensional Dust Extinction Open
Understanding the distribution and properties of molecular clouds is crucial for tracing the structure and evolution of the interstellar medium (ISM) and the large-scale morphology of the Milky Way. Here we present an all-sky catalog of 33…
View article: An All-sky 3D Dust Map Based on Gaia and LAMOST
An All-sky 3D Dust Map Based on Gaia and LAMOST Open
We present a comprehensive 3D dust-reddening map covering the entire Milky Way, constructed by combining reddening estimates based on Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) low-resolution spectra ( E ( B − V ) LA…
View article: The Dust Extinction Curve: Beyond <i>R</i>(<i>V</i>)
The Dust Extinction Curve: Beyond <i>R</i>(<i>V</i>) Open
The dust extinction curve is typically parameterized by a single variable, R ( V ), in optical and near-infrared wavelengths. R ( V ) controls the slope of the extinction-versus-wavelength curve, and is thought to reflect the grain-size di…
View article: Metallicities of 20 Million Giant Stars Based on Gaia XP Spectra
Metallicities of 20 Million Giant Stars Based on Gaia XP Spectra Open
We design an uncertainty-aware cost-sensitive neural network (UA-CSNet) to estimate metallicities from dereddened and corrected Gaia BP/RP (XP) spectra for giant stars. This method accounts for both stochastic errors in the input spectra a…
View article: Massive Acquisition of Ultraviolet Color Excess Information from GALEX and UVOT Bands
Massive Acquisition of Ultraviolet Color Excess Information from GALEX and UVOT Bands Open
This study employs stellar parameters from spectroscopic surveys and Zhang et al. (2023) based on Gaia BP/RP (XP) spectra, along with photometric data from Galaxy Evolution Explorer (GALEX), UV/Optical Telescope (UVOT), and Gaia, to obtain…
View article: Metallicities of 20 Million Giant Stars Based on Gaia XP spectra
Metallicities of 20 Million Giant Stars Based on Gaia XP spectra Open
We design an uncertainty-aware cost-sensitive neural network (UA-CSNet) to estimate metallicities from dereddened and corrected Gaia BP/RP (XP) spectra for giant stars. This method accounts for both stochastic errors in the input spectra a…
View article: Massive Acquisition of Ultraviolet Color Excess Information from GALEX and UVOT Bands
Massive Acquisition of Ultraviolet Color Excess Information from GALEX and UVOT Bands Open
This study employs stellar parameters from spectroscopic surveys and Zhang et al. based on Gaia XP spectra, along with photometric data from GALEX, UVOT, and Gaia, to obtain extensive ultraviolet color excess information for the relevant b…
View article: The Vertical Metallicity Gradient of the Galactic Disk for Mono-age Stellar Populations in LAMOST
The Vertical Metallicity Gradient of the Galactic Disk for Mono-age Stellar Populations in LAMOST Open
The vertical metallicity gradient of the Galactic disk offers valuable insights into the disk’s formation and chemical evolution over time. We utilized the Large Sky Area Multi-Object Fibre Spectroscopic Telescope low-resolution spectral y…
View article: Spatiotemporal Evolution and Driving Factors of Urban Resilience Against Disasters: A Dual Perspective of Urban Systems and Resilience Capacities
Spatiotemporal Evolution and Driving Factors of Urban Resilience Against Disasters: A Dual Perspective of Urban Systems and Resilience Capacities Open
With the global increase in disaster risks, enhancing urban resilience has become a critical strategy for risk mitigation and sustainable development. This study develops a two-dimensional indicator framework based on urban systems and res…
View article: The Dust Extinction Curve: Beyond R(V)
The Dust Extinction Curve: Beyond R(V) Open
The dust extinction curve is typically parameterized by a single variable, R(V), in optical and near-infrared wavelengths. R(V) controls the slope of the extinction-vs.-wavelength curve, and is thought to reflect the grain-size distributio…
View article: An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST
An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST Open
We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction c…
View article: An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST
An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST Open
We present a direct measurement of extinction curves using corrected $Gaia$ XP spectra of the common sources in $Gaia$ DR3 and LAMOST DR7. Our analysis of approximately 370 thousand high-quality samples yielded a high-precision average ext…
View article: Erratum: “Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3” (2024, ApJS, 271, 26)
Erratum: “Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3” (2024, ApJS, 271, 26) Open
Erratum: "Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3" (2024, ApJS, 271, 26), Xue Lu, Haibo Yuan, Shuai Xu, Ruoyi Zhang, Kai Xiao, Yang Huang, Timothy C. Beers, Jihye Hong
View article: A Star-based Method for the Precise Flux Calibration of the Chinese Space Station Telescope Slitless Spectroscopic Survey
A Star-based Method for the Precise Flux Calibration of the Chinese Space Station Telescope Slitless Spectroscopic Survey Open
The upcoming Chinese Space Station Telescope (CSST) slitless spectroscopic survey poses a challenge of flux calibration, which requires a large number of flux-standard stars. In this work, we design an uncertainty-aware residual attention …
View article: Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3
Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3 Open
We combine photometric data from GALEX GR6+7 All-Sky Imaging Survey and Gaia Early Data Release 3 with stellar parameters from the SAGA and PASTEL catalogs to construct high-quality training samples for dwarfs (0.4 < BP − RP < 1.6) and gia…
View article: A Comprehensive Correction of the Gaia DR3 XP Spectra
A Comprehensive Correction of the Gaia DR3 XP Spectra Open
By combining spectra from the CALSPEC and NGSL, as well as spectroscopic data from the LAMOST Data Release 7 (DR7), we have analyzed and corrected the systematic errors of the Gaia DR3 BP/RP (XP) spectra. The errors depend on the normalize…
View article: A star-based method for precise flux calibration of the Chinese Space Station Telescope (CSST) slitless spectroscopic survey
A star-based method for precise flux calibration of the Chinese Space Station Telescope (CSST) slitless spectroscopic survey Open
The upcoming Chinese Space Station Telescope (CSST) slitless spectroscopic survey poses a challenge of flux calibration, which requires a large number of flux-standard stars. In this work, we design an uncertainty-aware residual attention …
View article: A comprehensive correction of the Gaia DR3 XP spectra
A comprehensive correction of the Gaia DR3 XP spectra Open
By combining spectra from the CALSPEC and NGSL, as well as spectroscopic data from the LAMOST Data Release 7 (DR7), we have analyzed and corrected the systematic errors of the Gaia DR3 BP/RP (XP) spectra. The errors depend on the normalize…
View article: Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3
Stellar Loci. VII. Photometric Metallicities of 5 Million FGK Stars Based on GALEX GR6+7 AIS and Gaia EDR3 Open
We combine photometric data from GALEX GR6+7 AIS and Gaia EDR3 with stellar parameters from the SAGA and PASTEL catalogs to construct high-quality training samples for dwarfs ($\rm 0.4< BP-RP<1.6$) and giants ($\rm 0.6< BP-RP <1.6$). We ap…
View article: Exploring Be phenomena in OBA stars: A mid-infrared search
Exploring Be phenomena in OBA stars: A mid-infrared search Open
As early-type stars with a rotation speed close to their critical velocity, Be stars experience an event called the Be phenomenon. The material in their equator is ejected into outside space during the Be phenomenon and forms a circumstell…
View article: Exploring Be phenomena in OBA stars: a Mid-infrared search
Exploring Be phenomena in OBA stars: a Mid-infrared search Open
As early-type stars with a rotation speed close to their critical velocity, Be stars experience an event called the Be phenomenon. The material in their equator is ejected into outside space during the Be phenomenon and forms a circumstell…
View article: An R <sub>V</sub> Map of the Milky Way Revealed by LAMOST
An R <sub>V</sub> Map of the Milky Way Revealed by LAMOST Open
The total-to-selective extinction ratio, R V , is a key parameter for tracing the properties of interstellar dust, as it directly determines the variation of the extinction curve with wavelength. By utilizing accurate color excess measurem…
View article: Improvement of Pan-STARRS Photometric Calibration with LAMOST and Gaia
Improvement of Pan-STARRS Photometric Calibration with LAMOST and Gaia Open
In this work, we perform the recalibration of Pan-STARRS1 (PS1) photometry by correcting for position-dependent systematic errors using the spectroscopy-based stellar color regression (SCR) method, the photometry-based SCR method, and the …
View article: A Rv map of the Milky Way revealed by LAMOST
A Rv map of the Milky Way revealed by LAMOST Open
The total-to-selective extinction ratio, Rv, is a key parameter for tracing the properties of interstellar dust, as it directly determines the variation of the extinction curve with wavelength. By utilizing accurate color excess measuremen…
View article: Empirical extinction coefficients for the Swift-UVOT optical-through-ultraviolet passbands
Empirical extinction coefficients for the Swift-UVOT optical-through-ultraviolet passbands Open
We calculated empirical reddening and extinction coefficients with respect to the dust reddening map of Schlegel et al. for the Swift-UVOT passbands, using the 'star pair' method and photometric data from the UVOT Serendipitous Source Cata…
View article: Improvement of the Pan-STARRS Photometric Calibration with LAMOST and Gaia
Improvement of the Pan-STARRS Photometric Calibration with LAMOST and Gaia Open
In this work, we perform the re-calibration of PS1 photometry by correcting for position-dependent systematic errors using the spectroscopy-based Stellar Color Regression method (SCR), the photometry-based SCR method (SCR$'$), and the Gaia…
View article: Photometric calibration of the Stellar Abundance and Galactic Evolution Survey (SAGES): Nanshan One-meter Wide-field Telescope g, r, and i band imaging data
Photometric calibration of the Stellar Abundance and Galactic Evolution Survey (SAGES): Nanshan One-meter Wide-field Telescope g, r, and i band imaging data Open
In this paper, a total of approximately 2.6 million dwarfs were constructed\nas standard stars, with an accuracy of about 0.01-0.02 mag for each band, by\ncombining spectroscopic data from the Large Sky Area Multi-Object Fiber\nSpectroscop…