منابع مشابه
On the pulsation parallax of the variable star RR Lyr
We show that a straightforward application of the predicted relation connecting the absolute K magnitude of fundamental RR Lyrae variables to their period and metal content, together with current evolutionary predictions on the mass and luminos-ity of Horizontal Branch stars, supply a distance estimate to the prototype star RR Lyr in close agreement with the recent parallax determination by HST...
متن کاملClusters AgeS Experiment . RR Lyr Variables in the Globular Cluster NGC
We present V and B-band CCD photometry of 35 RR Lyr stars in the southern hemisphere globular cluster NGC 6362. Fourier decomposition of the light curves was used to estimate the basic properties of these variables. From the analysis of the RRc stars we obtain a mean mass of M = 0.531 ± 0.014 M⊙, luminosity logL/L⊙ = 1.656 ± 0.006, effective temperature Teff = 7429 ± 20, and helium abundance Y ...
متن کاملThe Outer Galactic Halo As Probed By RR Lyr Stars From the Palomar Transient Facility + Keck
We present initial results from our study of the outer halo of the Milky Way using a large sample of RR Lyr(ab) variables datamined from the archives of the Palomar Transient Facility. Of the 464 RR Lyr in our sample with distances exceeding 50 kpc, 62 have been observed spectroscopically at the Keck Observatory. vr and σ(vr ) are given as a function of distance between 50 and 110 kpc, and a ve...
متن کاملEvidence for an Overluminosity of the Variable Star Rr Lyr, and a Revised Distance to the Lmc
We use theoretical models to establish a tight relationship for the absolute magnitudes of RR Lyrae stars as a function of their periods and Strömgren pseudo-color c0 ≡ (u−v)0 − (v−b)0. Applying this to RR Lyr, and comparing the result with the predicted average absolute magnitude for stars of similar metallicity from the same models, yields an overluminosity of 0.064± 0.013 mag in Strömgren y ...
متن کاملThe Outer Galactic Halo As Probed By RR Lyr Stars From the Palomar Transient Facility + Keck 1
We present initial results from our study of the outer halo of the Milky Way using a large sample of RR Lyr(ab) variables datamined from the archives of the Palomar Transient Facility. Of the 464 RR Lyr in our sample with distances exceeding 50 kpc, 62 have been observed spectroscopically at the Keck Observatory. vr and σ(vr) are given as a function of distance between 50 and 110 kpc, and a ver...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1963
ISSN: 0004-6256
DOI: 10.1086/108956