The ASAS-SN catalogue of variable stars – IV. Periodic variables in the APOGEE survey

Journal Article · Fri Jun 21 00:00:00 EDT 2019 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stz1681· OSTI ID:1531198

Pawlak, Michał  ^[1]; Pejcha, O.  ^[1]; Jakubčík, P. ^[2]; Jayasinghe, T. ^[3]; Kochanek, C. S. ^[3]; Stanek, K. Z. ^[3]; Shappee, B. J. ^[4]; Holoien, T. W-S  ^[5]; Thompson, Todd A. ^[6]; Prieto, J. L. ^[7]; Dong, S. ^[8]; Shields, J. V. ^[9]; Pojmanski, G. ^[10]; Britt, C. A. ^[11]; Will, D. ^[12]

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1. Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University in Prague, 180 00 Prague, Czech Republic
2. Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University in Prague, 180 00 Prague, Czech Republic, New College, University of Oxford, Holywell Street, Oxford OX1 3BN, UK
3. Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA, Center for Cosmology and Astroparticle Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA
4. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
5. Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA
6. Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA, Center for Cosmology and Astroparticle Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA, Institute for Advanced Study, Princeton, NJ 08540, USA
7. Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército 441, Santiago, Chile, Millennium Institute of Astrophysics, Santiago, Chile
8. Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Road 5, Hai Dian District, China
9. Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
10. Warsaw University Observatory, Al Ujazdowskie 4, 00-478 Warsaw, Poland
11. ASC Technology Services, 433 Mendenhall Laboratory, 125 South Oval Mall, Columbus, OH 43210, USA
12. Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA, ASC Technology Services, 433 Mendenhall Laboratory, 125 South Oval Mall, Columbus, OH 43210, USA

ABSTRACT We explore the synergy between photometric and spectroscopic surveys by searching for periodic variable stars among the targets observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) using photometry from the All-Sky Automated Survey for Supernovae (ASAS-SN). We identified 1924 periodic variables among more than $$258\, 000$$ APOGEE targets; 465 are new discoveries. We homogeneously classified 430 eclipsing and ellipsoidal binaries, 139 classical pulsators (Cepheids, RR Lyrae, and δ Scuti), 719 long-period variables (pulsating red giants), and 636 rotational variables. The search was performed using both visual inspection and machine learning techniques. The light curves were also modelled with the damped random walk stochastic process. We find that the median [Fe/H] of variable objects is lower by 0.3 dex than that of the overall APOGEE sample. Eclipsing binaries and ellipsoidal variables are shifted to a lower median [Fe/H] by 0.2 dex. Eclipsing binaries and rotational variables exhibit significantly broader spectral lines than the rest of the sample. We make ASAS-SN light curves for all the APOGEE stars publicly available and provide parameters for the variable objects.

• Sponsoring Organization: USDOE
• OSTI ID: 1531198
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 487 Journal Issue: 4; ISSN 0035-8711
• Publisher: Oxford University Press
• Country of Publication: United Kingdom
• Language: English