Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-29
Astronomy and Astrophysics
Astrophysics
6 pages, 3 figures, to be published in "Observed HR diagrams and stellar evolution: the interplay between observational constr
Scientific paper
We present new B, V, I photometry in the standard Johnson-Cousins photometric system of two regions near the bar of the Large Magellanic Cloud (LMC), one of which is very close to LMC field used for the "Coimbra test on the synthetic CMD techniques". The two areas contain 128 RR Lyrae variables and more than 8000 clump stars. Once combined with Clementini et al. 2001 (astro-ph/0007471) photometry the new data-set allows us to get (i) accurate CMD's down to V~23 mag, (ii) full coverage of the B and V light variation for more than 80% of the RR Lyrae's, (iii) a very precise estimate of the LMC RR Lyrae's average apparent luminosity, (iv) an accurate estimate of the I luminosity of the LMC clump stars, and (v) an independent evaluation of the reddening in these regions of the LMC using the pulsational properties of the RR Lyrae's in our sample. A detailed comparison is made between our, OGLE II and MACHO photometries. We discuss the impact of our new results on the distance to the LMC and on the "short" and "long" distance scale controversy.
Bragaglia Angela
Carretta Eugenio
Clementini Gisella
Fabrizio L. Di
Gratton Raffaele G.
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