J/AJ/119/1793 NGC 6144 BVI photometry (Neely+, 2000) ================================================================================ CCD photometry of the galactic globular cluster NGC 6144. Neely R.K., Sarajedini A., Martins D.H. =2000AJ....119.1793N ================================================================================ ADC_Keywords: Clusters, globular ; Photometry, CCD Keywords: globular clusters: general - stars: AGB and post-AGB - techniques: photometric Abstract: 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 {rho} Ophiuchi dust cloud, approximately 30 northwest of the bright star {alpha} Scorpii (Antares). Our color-magnitude diagrams (CMDs) of NGC 6144 extend from above the tip of the first-ascent red giant branch (RGB) to ~3mag 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, 1984ApJS...55...45Z, 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 {rho} Ophiuchi dust cloud. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 16 27 14.1 -26 01 29 NGC 6144 ----------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 38 10 NGC 6144 photometry -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- NSM [1/1216] Star number Cl* NGC 6144 NSM NNNN in Simbad 6- 12 F7.2 pix xpos X position (1) 14- 20 F7.2 pix ypos Y position (1) 22- 26 F5.2 mag Vmag V magnitude 28- 32 F5.2 mag B-V B-V colour index 34- 38 F5.2 mag V-I V-I colour index -------------------------------------------------------------------------------- Note (1): North is up, and east is to the left. 1 pix = 0.396" -------------------------------------------------------------------------------- Table 2 : PAGB STARS ----------------------------------------------------------------- Star Vmag (B-V)_0_ (V-I)_0) N_B_ N_V_ N_I_ ----------------------------------------------------------------- PAGB 1 11.85+/-0.02 0.13+/-0.03 0.25+/-0.01 5 5 5 PAGB 2 16.74+/-0.03 -0.32+/-0.05 -0.23+/-0.04 3 5 5 PAGB 3 19.30+/-0.13 -0.34+/-0.17 -0.23+/-0.18 5 3 4 ----------------------------------------------------------------- History: From AJ electronic version ================================================================================ (End) Patricia Bauer [CDS] 15-Jan-2001