Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · astro-ph/9605098

On the Light Curve - Luminosity Relation of RR Lyrae Stars

Geza Kovacs·Johanna Jurcsik
View original source ↗Read source document ↗Export metadata ↓

Abstract

We use a large sample of RRab stars in globular clusters and in the Sculptor dwarf galaxy to decipher the relation between the Fourier decomposition and the luminosity. For fixing the zero point of the relation, we use the latest Baade-Wesselink (BW) results. It is shown that the most plausible representation of the absolute brightness (in V color) consists of a linear expression of the period and of the Fourier parameters A_1 and Phi_31 (computed also from the V light curve). We derive an average M_V = Alpha [Fe/H] + Beta relation from all the available Fourier data. Our results exclude any values of Alpha larger than 0.19, in agreement with most of the BW and evolutionary studies. We give age and reddened distance modulus estimations for the clusters entering in our analysis.

Explore related subjects

astro-ph

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Geza Kovacs, Johanna Jurcsik. 1996-05-16. On the Light Curve - Luminosity Relation of RR Lyrae Stars. https://doi.org/10.1086/310160

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Cosmic Conundrums with Quantum Corrections

Darh energy was discovered over 25 years ago and we do not have an explanation of it. Dark matter comprises 95% of matter in the universe and we still don't know what it is. The Webb telescope has been finding fully formed galaxies with massive black holes millions of times the mass of the sun in the early universe and we don't have any explanation. A quantum density limitation will be used to solve these and other outstanding problems.

astro-ph↗
arXiv2026

On binary pulsars and the force of gravity

The energy-momentum budget of the astrophysical systems can be studied by the exact local conservation equation derived by Landau and Lifshitz. We show that a similar equation is valid for the Einstein-Cartan gravity. We reanalyze a binary pulsar system using the Landau-Lifshitz conservation equation and show that the orbital period change rate can be completely understood as a curvature backreaction process. Taking into account the detailed theoretical and observational research of relativistic binary pulsar systems, especially the system of Hulse and Taylor, we conclude that general relativity and astrophysical observations rule out the existence of gravitational radiation. We comment upon the LIGO GW events and their alternative explanation, as well as the recent pulsar timing arrays data.

astro-ph↗
arXiv2026

Oscillation frequencies and mode lifetimes in alpha Centauri A

We analyse our recently-published velocity measurements of alpha Cen A (Butler et al. 2004). After adjusting the weights on a night-by-night basis in order to optimize the window function to minimize sidelobes, we extract 42 oscillation frequencies with l=0 to 3 and measure the large and small frequency separations. We give fitted relations to these frequencies that can be compared with theoretical models and conclude that the observed scatter about these fits is due to the finite lifetimes of the oscillation modes. We estimate the mode lifetimes to be 1-2 d, substantially shorter than in the Sun.

astro-ph↗