New field RR Lyrae variables in the outer parts of the LMC and the properties of the LMC halo

Details New field RR Lyrae variables in the outer parts of the LMC and the properties of the LMC halo New field RR Lyrae variables in the outer parts of the LMC and the properties of the LMC halo

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1279k&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Dec. 1991, p. 1279-1291.

Astronomy and Astrophysics

Astronomy

50

Galactic Structure, Halos, Magellanic Clouds, Star Distribution, Variable Stars, Astronomical Models, Globular Clusters, Light Curve, Star Formation, Stellar Magnitude

Scientific paper

The detections are reported of four new type-ab RR Lyrae variables that belong to the field of the LMC, in the direction of NGC 1466, and of a possible field variable, near the Reticulum system. A King model that fits the surface densities of the known LMC field RR Lyrae stars of type-ab has a limiting radius of 15 kpc. An exponential disk model that fits these densities has a scale length of 2.6 kpc. These models contain about 10,000 type-ab RR Lyrae stars and have a central surface density of about 22 of these stars per square degree. The LMC field halo of Population II stars has Mv of about -15.2 and a mass of about 1.6 x 10 exp 8 solar masses. It is proposed that the efficiencies of the earliest star-formation processes are comparable in the two systems. The LMC field RR Lyrae stars have a period-frequency distribution similar to those found in the outer halo of the Galaxy.

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