Double-mode RR Lyrae stars in the globular cluster IC 4499

Details Double-mode RR Lyrae stars in the globular cluster IC 4499 Double-mode RR Lyrae stars in the globular cluster IC 4499

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..825c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Oct. 1986, p. 825-843. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

53

Globular Clusters, Lyra Constellation, Star Clusters, Variable Stars, Amplitude Distribution Analysis, Astronomical Photography, Astronomical Photometry, Light Curve, Stellar Composition, Stellar Magnitude, Stellar Oscillations

Scientific paper

Thirteen double-mode RR Lyrae (RRd) stars, with mean magnitudes >BVP1< = 0d.357 with σ = 0d.005 (cf. >P1< = 0d.40 for OoII RRd stars), and the mean ratio of the first-overtone period to the fundamental period is >P1/P0< = 0.7444±0.0002. The mean double-mode pulsation mass for the 13 stars is 0.538±0.004 M_sun;. Such an average mass is ≡0.11 M_sun; smaller than that for RRd stars found in OoII systems. The metal abundances for the RRd stars, and for the system of RR Lyrae stars as a whole, are found to be consistent with >[Fe/H]< = -1.38±0.20, determined from ΔS spectroscopy. In the Petersen diagram, all known RRd stars now divide into two groups (split according to Oosterhoff type). With a reddening of EB-V = 0.27±0.03 mag, the cluster distance modulus is (m-M)0 = 16.20±0.23 mag.

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