We derived the distance to the central region of the Sagittarius (Sgr) dwarf spheroidal galaxy from the red giant branch tip. The obtained distance modulus is (m-M)0= 17.10 +/- 0.15, corresponding to a heliocentric distance D= 26.30 +/- 1.8Kpc. This estimate is in good agreement with the distance obtained from RR Lyrae (RR Ly) stars of the globular cluster M 54, located in the core of the Sgr galaxy, once the most accurate estimate of the cluster metallicity and the most recent calibration of the MV(RRLy) versus [Fe/H] relation are adopted.
The distance to the Sagittarius dwarf spheroidal galaxy from the red giant branch tip / MONACO L.; BELLAZZINI M.; FERRARO F.R.; PANCINO E.. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - STAMPA. - 353:(2004), pp. 874-878. [10.1111/j.1365-2966.2004.08122.x]
The distance to the Sagittarius dwarf spheroidal galaxy from the red giant branch tip
FERRARO, FRANCESCO ROSARIO;
2004
Abstract
We derived the distance to the central region of the Sagittarius (Sgr) dwarf spheroidal galaxy from the red giant branch tip. The obtained distance modulus is (m-M)0= 17.10 +/- 0.15, corresponding to a heliocentric distance D= 26.30 +/- 1.8Kpc. This estimate is in good agreement with the distance obtained from RR Lyrae (RR Ly) stars of the globular cluster M 54, located in the core of the Sgr galaxy, once the most accurate estimate of the cluster metallicity and the most recent calibration of the MV(RRLy) versus [Fe/H] relation are adopted.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
