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

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

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...331...70g&link_type=abstract

Astronomy and Astrophysics, v.331, p.70-80 (1998)

Astronomy and Astrophysics

Astrophysics

60

Globular Clusters: Ngc6553, Galaxy: Center, Blue Stragglers, Hr Diagram

Scientific paper

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 find a mean magnitude for the horizontal branch of VHB =3D 16.92, and KHB =3D 12.42 +/- 0.01. Assuming a reddening of E(B-V)=3D 0.7, the mean distance modulus is (m-M)_0 =3D 13.6 giving an heliocentric distance of 5.2Kpc. 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) =3D 13.10 transforming to M_K =3D -7.34 and (V-K){_0} =3D 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] =3D -0.22 +/- 0.05 has been adopted. The helium abundance estimated via the R' method yields Y_p ~ 0.28 +/- 0.03. Based on observations obtained at ESO-La Silla, Chile and with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, operated by AURA Inc. under contract to NASA.\hfill\break Appendix only available in electronic form at the CDS (Strasbourg) via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

Affiliated with

Also associated with

No associations

Rating

Infrared array photometry of bulge globular clusters. I. Combined ground based JK and HST VI photometry of NGC 6553 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Infrared array photometry of bulge globular clusters. I. Combined ground based JK and HST VI photometry of NGC 6553, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared array photometry of bulge globular clusters. I. Combined ground based JK and HST VI photometry of NGC 6553 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1655432