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https://doi.org/10.3847/1538-4357/ac106f

On the Use of Field RR Lyrae As Galactic Probes: IV. New Insights Into and Around the Oosterhoff Dichotomy*

M. Fabrizio, V. F. Braga, J. Crestani, G. Bono, I. Ferraro, G. Fiorentino, G. Iannicola, G. W. Preston, C. Sneden, F. Thévenin, G. Altavilla, B. Chaboyer, M. Dall’Ora, R. da Silva, E. K. Grebel, C. K. Gilligan, H. Lala, B. Lemasle, D. Magurno, M. Marengo, S. Marinoni, P. M. Marrese, C. E. Martínez-Vázquez, N. Matsunaga, M. Monelli, et al.
The Astrophysical Journal 919 (2) 118 (2021)
https://doi.org/10.3847/1538-4357/ac1115

Discovery of an Ultra-faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration Survey

W. Cerny, A. B. Pace, A. Drlica-Wagner, P. S. Ferguson, S. Mau, M. Adamów, J. L. Carlin, Y. Choi, D. Erkal, L. C. Johnson, T. S. Li, C. E. Martínez-Vázquez, B. Mutlu-Pakdil, D. L. Nidever, K. A. G. Olsen, A. Pieres, E. J. Tollerud, J. D. Simon, A. K. Vivas, D. J. James, N. Kuropatkin, S. Majewski, D. Martínez-Delgado, P. Massana, A. E. Miller, et al.
The Astrophysical Journal 910 (1) 18 (2021)
https://doi.org/10.3847/1538-4357/abe1af

Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period–Fourier–Metallicity Relations for Fundamental-mode RR Lyrae

Joseph P. Mullen, Massimo Marengo, Clara E. Martínez-Vázquez, Jillian R. Neeley, Giuseppe Bono, Massimo Dall’Ora, Brian Chaboyer, Frédéric Thévenin, Vittorio F. Braga, Juliana Crestani, Michele Fabrizio, Giuliana Fiorentino, Christina K. Gilligan, Matteo Monelli and Peter B. Stetson
The Astrophysical Journal 912 (2) 144 (2021)
https://doi.org/10.3847/1538-4357/abefd4

The Gaia-ASAS-SN Classical Cepheid Sample. I. Sample Selection

Laura Inno, Hans-Walter Rix, K. Z. Stanek, T. Jayasinghe, E. Poggio, R. Drimmel and A. Rotundi
The Astrophysical Journal 914 (2) 127 (2021)
https://doi.org/10.3847/1538-4357/abf940

Studies of RR Lyrae Variables in Binary Systems. I. Evidence of a Trimodal Companion Mass Distribution

Gergely Hajdu, Grzegorz Pietrzyński, Johanna Jurcsik, Márcio Catelan, Paulina Karczmarek, Bogumił Pilecki, Igor Soszyński, Andrzej Udalski and Ian B. Thompson
The Astrophysical Journal 915 (1) 50 (2021)
https://doi.org/10.3847/1538-4357/abff4b

Possible Evidence of Hydrogen Emission in the First-overtone and Multimode RR Lyrae Variables

Xiao-Wei 晓苇 Duan 段, Xiao-Dian 孝钿 Chen 陈, Li-Cai 李才 Deng 邓, Fan 帆 Yang 杨, Chao 超 Liu 刘, Anupam Bhardwaj and Hua-Wei 华伟 Zhang 张
The Astrophysical Journal 909 (1) 25 (2021)
https://doi.org/10.3847/1538-4357/abd6b9

Evidence of a Dwarf Galaxy Stream Populating the Inner Milky Way Halo

Khyati Malhan, Zhen Yuan, Rodrigo A. Ibata, Anke Arentsen, Michele Bellazzini and Nicolas F. Martin
The Astrophysical Journal 920 (1) 51 (2021)
https://doi.org/10.3847/1538-4357/ac1675

On the Use of Field RR Lyrae as Galactic Probes. V. Optical and Radial Velocity Curve Templates

V. F. Braga, J. Crestani, M. Fabrizio, G. Bono, C. Sneden, G. W. Preston, J. Storm, S. Kamann, M. Latour, H. Lala, B. Lemasle, Z. Prudil, G. Altavilla, B. Chaboyer, M. Dall’Ora, I. Ferraro, C. K. Gilligan, G. Fiorentino, G. Iannicola, L. Inno, S. Kwak, M. Marengo, S. Marinoni, P. M. Marrese, C. E. Martínez-Vázquez, et al.
The Astrophysical Journal 919 (2) 85 (2021)
https://doi.org/10.3847/1538-4357/ac1074

The Far-away Blues: Exploring the Furthest Extents of the Boötes I Ultra-faint Dwarf Galaxy

Carrie Filion and Rosemary F. G. Wyse
The Astrophysical Journal 923 (2) 218 (2021)
https://doi.org/10.3847/1538-4357/ac2df1

Eridanus IV: an Ultra-faint Dwarf Galaxy Candidate Discovered in the DECam Local Volume Exploration Survey

W. Cerny, A. B. Pace, A. Drlica-Wagner, S. E. Koposov, A. K. Vivas, S. Mau, A. H. Riley, C. R. Bom, J. L. Carlin, Y. Choi, D. Erkal, P. S. Ferguson, D. J. James, T. S. Li, D. Martínez-Delgado, C. E. Martínez-Vázquez, R. R. Munoz, B. Mutlu-Pakdil, K. A. G. Olsen, A. Pieres, J. D. Sakowska, D. J. Sand, J. D. Simon, A. Smercina, G. S. Stringfellow, et al.
The Astrophysical Journal Letters 920 (2) L44 (2021)
https://doi.org/10.3847/2041-8213/ac2d9a

Identifying low-amplitude pulsating stars through microlensing observations

Sedighe Sajadian, Richard Ignace and Hilding Neilson
Monthly Notices of the Royal Astronomical Society 507 (4) 5177 (2021)
https://doi.org/10.1093/mnras/stab2410

The RR Lyrae projected density distribution from the Galactic centre to the halo

María Gabriela Navarro, Dante Minniti, Roberto Capuzzo-Dolcetta, et al.
Astronomy & Astrophysics 646 A45 (2021)
https://doi.org/10.1051/0004-6361/202038463

The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia’s astrometric sample

P. Ramos, T. Antoja, C. Mateu, et al.
Astronomy & Astrophysics 646 A99 (2021)
https://doi.org/10.1051/0004-6361/202039830

Variability, periodicity, and contact binaries in WISE

Evan Petrosky, Hsiang-Chih Hwang, Nadia L Zakamska, Vedant Chandra and Matthew J Hill
Monthly Notices of the Royal Astronomical Society 503 (3) 3975 (2021)
https://doi.org/10.1093/mnras/stab592

Revealing the Structure and Internal Rotation of the Sagittarius Dwarf Spheroidal Galaxy with Gaia and Machine Learning

Andrés del Pino, Mark A. Fardal, Roeland P. van der Marel, Ewa L. Łokas, Cecilia Mateu and Sangmo Tony Sohn
The Astrophysical Journal 908 (2) 244 (2021)
https://doi.org/10.3847/1538-4357/abd5bf

Cepheid metallicity in the Leavitt law (C-metall) survey – I. HARPS-N@TNG spectroscopy of 47 classical Cepheids and 1 BL Her variables

V Ripepi, G Catanzaro, R Molinaro, et al.
Monthly Notices of the Royal Astronomical Society 508 (3) 4047 (2021)
https://doi.org/10.1093/mnras/stab2460

Blueshifted Hydrogen Emission and Shock Wave of RR Lyrae Variables in SDSS and LAMOST

Xiao-Wei 晓苇 Duan 段, Xiaodian 孝钿 Chen 陈, Weijia 唯佳 Sun 孙, Licai 李才 Deng 邓, Huawei 华伟 Zhang 张, Fan 帆 Yang 杨 and Chao 超 Liu 刘
The Astrophysical Journal 918 (1) 3 (2021)
https://doi.org/10.3847/1538-4357/ac174a

Chromospheric Activity of Periodic Variable Stars Based on the LAMOST Low- and Medium-resolution Spectral Survey

Liu Long, Li-yun Zhang, Shao-Lan Bi, Jianrong Shi, Hong-Peng Lu, Xianming L. Han, Haifeng Wang and Misra Prabhakar
The Astrophysical Journal Supplement Series 253 (2) 51 (2021)
https://doi.org/10.3847/1538-4365/abe30b

Chemo-kinematics of the Gaia RR Lyrae: the halo and the disc

Giuliano Iorio and Vasily Belokurov
Monthly Notices of the Royal Astronomical Society 502 (4) 5686 (2021)
https://doi.org/10.1093/mnras/stab005

Orbital phase-driven biases in galactic mass constraints from stellar streams

Stella Reino, Robyn E Sanderson, Nondh Panithanpaisal, Elena M Rossi and Konrad Kuijken
Monthly Notices of the Royal Astronomical Society 509 (4) 5365 (2021)
https://doi.org/10.1093/mnras/stab3176

Galactic open cluster Cepheids – a census based on Gaia EDR3

Xiaoyue Zhou and Xiaodian Chen
Monthly Notices of the Royal Astronomical Society 504 (4) 4768 (2021)
https://doi.org/10.1093/mnras/stab1209

Kinematics and multiband period–luminosity–metallicity relation of RR Lyrae stars via statistical parallax

T D Muhie, A K Dambis, L N Berdnikov, A Y Kniazev and E K Grebel
Monthly Notices of the Royal Astronomical Society 502 (3) 4074 (2021)
https://doi.org/10.1093/mnras/stab219

Stellar substructures in the periphery of the Magellanic Clouds with the VISTA hemisphere survey from the red clump and other tracers

Dalal El Youssoufi, Maria-Rosa L Cioni, Cameron P M Bell, et al.
Monthly Notices of the Royal Astronomical Society 505 (2) 2020 (2021)
https://doi.org/10.1093/mnras/stab1075

All-sky dynamical response of the Galactic halo to the Large Magellanic Cloud

Charlie Conroy, Rohan P. Naidu, Nicolás Garavito-Camargo, et al.
Nature 592 (7855) 534 (2021)
https://doi.org/10.1038/s41586-021-03385-7

A revisited study of Cepheids in open clusters in the Gaia era

Gustavo E Medina, Bertrand Lemasle and Eva K Grebel
Monthly Notices of the Royal Astronomical Society 505 (1) 1342 (2021)
https://doi.org/10.1093/mnras/stab1267

Confirmation and physical characterization of the new bulge globular cluster Patchick 99 from the VVV and Gaia surveys

E. R. Garro, D. Minniti, M. Gómez, et al.
Astronomy & Astrophysics 649 A86 (2021)
https://doi.org/10.1051/0004-6361/202039255