Publikace ÚTF

The ASAS-SN catalogue of variable stars - VII. Contact binaries are different above and below the Kraft break

Jayasinghe, T.; Stanek, K. Z.; Kochanek, C. S.; Shappee, B. J.; Pinsonneault, M. H.; Holoien, T. W. -S.; Thompson, Todd A.; Prieto, J. L.; Pawlak, M.; Pejcha, O.; Pojmanski, G.; Otero, S.; Hurst, N.; Will, D.

We characterize {~ } 71 200 W Ursae Majoris (UMa) type (EW) contact binaries, including {~ } 12 600 new discoveries, using All-Sky Automated Survey for SuperNovae (ASAN-SN)V-band all-sky light curves along with archival data from Gaia, 2MASS, AllWISE, LAMOST, GALAH, RAVE, and APOGEE. There is a clean break in the EW period-luminosity relation at log (P/d) {~eq } -0.30, separating the longer period, early-type EW binaries from the shorter period, late-type systems. The two populations are even more cleanly separated in the space of period and effective temperature, by T_eff=6710 K-1760 K log (P/0.5 d). Early-type and late-type EW binaries follow opposite trends in Teff with orbital period. For longer periods, early-type EW binaries are cooler, while late-type systems are hotter. We derive period-luminosity relationships in the WJK, V, Gaia DR2 G, J, H, Ks, and W1 bands for the late-type and early-type EW binaries separated by both period and effective temperature, and by period alone. The dichotomy of contact binaries is almost certainly related to the Kraft break and the related changes in envelope structure, winds, and angular momentum loss.

type:article
journal:Mon. Not. Roy. Astron. Soc.
volume:493
nr:0
pages:4045-4057
year:2020
eprint:1911.09685
grants:Cat-In-hAT: Catastrophic Interactions of Binary Stars and the Associated Transients, Horizon 2020 ERC Starting Grant 803158; 2019-2023; hlavní řešitel: Ondřej Pejcha
Časová proměnnost v astronomii: účast v projektu All-Sky Automated Survey for Supernovae; 2019-2022; hlavní řešitel: Ondřej Pejcha
Teorie a pozorování astronomických tranzientů: supernovy z hmotných hvězd a splynutí hvězd, Primus/17/SCI/17; 2017-2019; hlavní řešitel: Ondřej Pejcha
files:
jayasinghe7_pawlak_pejcha_staa518.pdf (12987.24 kB)

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