J/A+AS/110/1 J/A+AS/110/1 CCD photometry of Pal 1 J Borissova N Spassova Astron. Astrophys. Suppl. Ser. 110 1 1995 1995A&AS..110....1B Clusters, globular Photometry, CCD globular clusters: individual (Pal 1) Hertzsprung-Russell (HR diagram) A CCD photometry of the halo cluster Palomar 1 is presented in the Thuan-Gunn photometric system. The principal sequences of the color-magnitude diagrams are delineated in different spectral bands. The color- magnitude diagrams of the cluster show a well defined red horizontal branch, a subgiant branch and a main-sequence down to about two magnitudes below the main sequence turnoff. The giant branch is absent and the brightest stars are the horizontal branch stars. The age of the cluster determined by comparison with the isochrones of Bell & VandenBerg (1987ApJS...63..335B) is consistent with an age in the interval 12-14Gyr. A distance modulus of (m-M)_g0_=15.38+/-0.15 magnitude and E(g-r)=0.16 has been derived. An estimate of the cluster structural parameters such as core radius and concentration parameter gives r_c_=1.5pc and c=1.46. A mass estimate of 1.1x10^3^M_{sun}_ and a mass-to-light ratio of 1.79 have been obtained using King's (1966AJ.....71...64K) method. The morphology of color-magnitude diagrams allows Pal 1 to be interpreted as probably a globular cluster rather than an old open one. For a description of the uvgr photometric system, see e.g. <GCPD/38>

Pal 1C 0325+79403 33 23.0+79 34 50

ID Identification number (Palomar 1 BS NNN) --- Xpos X position number=1 1pix=0.8arcsec. X increasing from North to South, Y from East to West. pix Ypos Y position number=1 1pix=0.8arcsec. X increasing from North to South, Y from East to West. pix gmag g magnitude mag rmag r magnitude mag imag i magnitude mag zmag z magnitude mag James Marcout, Patricia Bauer CDS 1997Jun12 UNKNOWN UNKNOWN Prepared via OCR at CDS. J_A+AS_110_1.xml