CCD Photometry of the Galactic Globular Cluster NGC 6144

Details CCD Photometry of the Galactic Globular Cluster NGC 6144 CCD Photometry of the Galactic Globular Cluster NGC 6144

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119.1793n&link_type=abstract

The Astronomical Journal, Volume 119, Issue 4, pp. 1793-1802.

Astronomy and Astrophysics

Astronomy

7

Galaxy: Globular Clusters: General, Stars: Agb And Post-Agb, Techniques: Photometric

Scientific paper

We present CCD photometry in the BVI-filter passbands for the Galactic globular cluster NGC 6144. This cluster is located in the direction of the ρ Ophiuchi dust cloud, approximately 30' northwest of the bright star α Scorpii (Antares). Our color-magnitude diagrams (CMDs) of NGC 6144 extend from above the tip of the first-ascent red giant branch (RGB) to ~3 mag below the horizontal branch (HB). The morphology of the HB is predominantly blueward of the RR Lyrae instability strip, while the RGB is relatively steep, signifying a low-to-intermediate metal abundance. Our CMD also reveals the presence of three candidate post-asymptotic giant branch stars. We find VHB=16.30+/-0.07 coupling the measured RGB color at the level of the HB with a polynomial describing the shape of the RGB, we have utilized the simultaneous reddening and metallicity method of Sarajedini to estimate a metallicity of [Fe/H]=-1.81+/-0.12 (on the Zinn & West scale) and a mean reddening of E(B-V)=0.41+/-0.02. In addition to this mean level, our observations reveal that the reddening has a spatially variable component generally increasing from north to south consistent with the expected density variations in the ρ Ophiuchi dust cloud.

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