Double-Mode Radial Pulsations among RR Lyrae Stars

Abstract

Double-mode RR Lyr type stars are important for studies of properties of horizontal-branch stars. In particular, two periods coupled with spectral properties give a mass estimate that is independent of evolutionary models. Here, we present 59 new Galactic double-mode RR Lyr stars found in the LINEAR survey data with the fundamental radial mode and the first overtone exited (RRd stars). These stars may be useful for constraining the mass-metallicity relation for field horizontal-branch stars. Also, new RRd stars found in the LMC by EROS-II are verified. We present the updated Petersen diagram and the distribution of the fundamental mode periods. Comments on selected variable stars from LINEAR and LMC EROS-II surveys are also presented, including very rare objects: the third known mode-switching RR Lyr and Cepheid pulsating simultaneously in three radial modes.

large tables included as ancillary files

References in corpus (5)

• Exploring the Variable Sky with LINEAR. III. Classification of Periodic Light Curves
• Eclipsing binaries in the MACHO database: New periods and classifications for 3031 systems in the Large Magellanic Cloud
• Double mode RR Lyrae stars in Omega Centauri
• The beat Cepheids in the Magellanic Clouds: an analysis from the EROS-2 database
• Analysis of a selected sample of RR Lyrae stars in LMC from OGLE III

Cited by in corpus (9)

• The ASAS-SN Catalog of Variable Stars I: The Serendipitous Survey
• An RR Lyrae family portrait: 33 stars observed in Pisces with K2-E2
• On the modulation of RR Lyrae stars in the globular cluster M3
• The Identification of RR Lyrae and Delta Scuti Stars from Variable GALEX Ultraviolet Sources
• Intriguing triple-mode RR Lyrae star with period doubling
• The Changing Lightcurve of the Double-Mode RR Lyrae Variable Star V338 Boo
• RR Lyrae mode switching in globular cluster M 68 (NGC 4590)
• A Search for Extra-Tidal RR Lyrae in the Globular Cluster NGC 5024 and NGC 5053
• Caught in the Act: Observations of the Double-mode RR Lyrae V338 Boo During the Disappearance of a Pulsation Mode