Two double-mode RR Lyrae stars in the field

Journal Article · Wed May 01 04:00:00 EDT 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/169973· OSTI ID:5394086

Clement, C M; Kinman, T D; Suntzeff, N B ^[1]

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1. David Dunlap Observatory, Toronto (Canada) Kitt Peak National Observatory, Tucson, AZ (USA) Observatorio Interamericano de Cerro Tololo, La Serena (Chile)

In order to use RR Lyrae stars as reliable distance indicators, it is necessary to know how the masses of these stars are related to the metal abundance. RR Lyrae stars in the field have a greater range of periods and metal abundance than those in globular clusters. Thus, it is important to identifying double-mode RR Lyrae stars (RRd stars) in the field to test the mass-metal abundance relation. Up to the present, however, the only RRd star to have been identified in the field is AQ Leo. Here, evidence is presented for the existence of two others. Data are given on their periods, mean B magnitudes, mode amplitudes, mean B-V colors, masses, and (Fe/H) values. The results give no evidence for a mass-metallicity relationship among the three known RRd field stars, but they show overall agreement with the mass-metallicity relation given by cluster RRd stars. 34 refs.

• OSTI ID: 5394086
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 372; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
BRIGHTNESS
CHEMICAL COMPOSITION
COLOR
DISTANCE
ELEMENT ABUNDANCE
MASS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
SPECTROSCOPY
STAR CLUSTERS
STARS
VARIABLE STARS