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Infrared array photometry of bulge globular clusters I. Combined ground based JK and HST VI photometry of NGC 6553

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Infrared array photometry of bulge globular clusters I. Combined ground based JK and HST VI photometry of NGC 6553

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Título Infrared array photometry of bulge globular clusters I. Combined ground based JK and HST VI photometry of NGC 6553
Autor Guarnieri, M.D.
Ortolani, Sergio
Montegriffo, P.
Renzini, Alvio
Barbuy, Beatriz
Bica, Eduardo Luiz Damiani
Moneti, Andrea
Abstract JK infrared photometry for the bulge globular cluster NGC 6553, combined with high resolution visual VI observations are presented and discussed in connection with the bulge metal rich population. The infrared data were taken with IRAC2 at ESO 2.2m telescope while the optical counterparts are from Hubble Space Telescope (HST). We nd a mean magnitude for the horizontal branch of VHB = 16.92, and KHB = 12.42 ± 0.01. Assuming a reddening of E(B − V) = 0.7, the mean distance modulus is (m − M)0 = 13.6 giving an heliocentric distance of 5.2 Kpc. This distance is slightly higher than that previously published by Ortolani et al. (1990, hereafter OBB90). The brightest giants have been detected at K ~ 6.5 and (V −K) = 13.10 transforming to MK = −7.34 and (V−K)0 = 11.20, which are exceptionally high values for a globular cluster. The metallicity has been found to be consistent with previous values and an average of [Fe/H] = −0.22±0.05 has been adopted. The helium abundance estimated via the R' method yields Yp ~ 0.28 ± 0.03.
Contido em Astronomy and Astrophysics. Berlin. Vol. 331, no. 1 (Mar. 1998), p. 70-80
Assunto Aglomerado globular NGC 6553
Evolucao estelar
Fotometria
Hubble space telescope
Metalicidade
[en] Blue stragglers
[en] Galaxy: center
[en] Globular clusters: NGC6553
[en] HR diagram
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98058
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