Search Publications
BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS)
Cunha, Katia; Smith, Verne V.; Majewski, Steven R. +11 more
Elements with weak and blended spectral features in stellar spectra are challenging to measure and require specialized analysis methods to precisely measure their chemical abundances. In this work, we have created a catalog of approximately 120,000 giants with high signal-to-noise Apache Point Observatory Galactic Evolution Experiment (APOGEE) Dat…
New Open-cluster Candidates Found in the Galactic Disk Using Gaia DR2/EDR3 Data
Chen, Li; Zhang, Xi; He, Zhihong +6 more
We report 541 new open-cluster candidates in Gaia EDR3 through revisiting the cluster results from an earlier analysis of Gaia DR2, which revealed nearly 1000 open-cluster candidates in the solar neighborhood (mostly d <3 kpc) residing at Galactic latitudes ∣b∣ < 20°. A subsequent comparison with lists of known clusters shows a large increas…
Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties
Yang, Guang; Brandt, W. N.; Leja, Joel +9 more
W-CDF-S, ELAIS-S1, and XMM-LSS will be three Deep-Drilling Fields (DDFs) of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), but their extensive multiwavelength data have not been fully utilized as done in the COSMOS field, another LSST DDF. To prepare for future science, we fit source spectral energy distributions (SEDs) from…
The Value-added Catalog for LAMOST DR8 Low-resolution Spectra
Xiang, Maosheng; Huang, Yang; Yuan, Haibo +3 more
We present a value-added catalog containing stellar parameters estimated from 7.10 million low-resolution spectra for 5.16 million unique stars with spectral signal-to-noise ratios (S/N) higher than 10 obtained by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Galactic spectroscopic surveys. The catalog presents values of s…
Detection of δ Scuti Pulsators in the Eclipsing Binaries Observed by TESS
Zhang, Xiaobin; Xiong, Jianping; Ji, Kaifan +6 more
Based on 2 minute cadence TESS data from sectors 1-50, we report the results of the systematic extraction of δ Scuti-type pulsations in the 6431 eclipsing binaries with orbital periods shorter than 13 days. A total number of 242 pulsators were found in those systems, including 143 new discoveries. We examined their pulsation properties based on th…
An Updated Metal-dependent Theoretical Scenario for Classical Cepheids
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +3 more
To properly quantify the possible residual systematic errors affecting the classical Cepheid distance scale, a detailed theoretical scenario is recommended. By extending the set of nonlinear, convective pulsation models published for Z = 0.02 to Z = 0.004, Z = 0.008, and Z = 0.03, we provide a detailed homogeneous, nonlinear model grid taking into…
CLASSY. II. A Technical Overview of the COS Legacy Archive Spectroscopic Survey
Ouchi, Masami; Kewley, Lisa J.; Ravindranath, Swara +43 more
The COS Legacy Archive Spectroscopic SurveY (CLASSY) is designed to provide the community with a spectral atlas of 45 nearby star-forming galaxies that were chosen to cover similar properties to those seen at high z (z > 6). The prime high-level science product of CLASSY is accurately coadded UV spectra, ranging from ~1000 to 2000 Å, derived fr…
First Results on RR Lyrae Stars with the TESS Space Telescope: Untangling the Connections between Mode Content, Colors, and Distances
Smolec, R.; Christensen-Dalsgaard, J.; Derekas, A. +25 more
The Transiting Exoplanet Survey Satellite (TESS) space telescope is collecting continuous, high-precision optical photometry of stars throughout the sky, including thousands of RR Lyrae stars. In this paper, we present results for an initial sample of 118 nearby RR Lyrae stars observed in TESS Sectors 1 and 2. We use differential image photometry …
NuSTAR Observations of 52 Compton-thick Active Galactic Nuclei Selected by the Swift/Burst Alert Telescope All-sky Hard X-Ray Survey
Tanimoto, Atsushi; Ueda, Yoshihiro; Ricci, Claudio +2 more
We present systematic broadband X-ray spectral analysis of 52 Compton-thick ( $24\leqslant \mathrm{log}{N}_{{\rm{H}}}^{\mathrm{LOS}}/{\mathrm{cm}}^{-2}$ ) active galactic nucleus (CTAGN) candidates selected by the Swift/Burst Alert Telescope all-sky hard X-ray survey observed with Chandra, X-ray Multi-Mirror Mission-Newton (XMM-Newton), Swift/X-Ra…
A New Iron Emission Template for Active Galactic Nuclei. I. Optical Template for the Hβ Region
Laor, Ari; Ho, Luis C.; Barth, Aaron J. +1 more
We present a new empirical template for iron emission in active galactic nuclei (AGNs) covering the 4000-5600 Å range. The new template is based on a spectrum of the narrow-line Seyfert 1 galaxy Mrk 493 obtained with the Hubble Space Telescope. In comparison with the canonical iron template object I Zw 1, Mrk 493 has narrower broad-line widths, lo…