J/A+AS/110/1 CCD photometry of Pal 1 (Borissova+ 1995)
The CCD photometry of the globular cluster Palomar 1.
Borissova J., Spassova N.
<Astron. Astrophys. Suppl. Ser. 110, 1 (1995)>
=1995A&AS..110....1B 1995A&AS..110....1B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Photometry, CCD
Keywords: clusters: globular: Pal 1 - HR diagram
Abstract:
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 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 rc=1.5pc and c=1.46. A mass estimate of 1.1x103M☉ and
a mass-to-light ratio of 1.79 have been obtained using King's
(1966AJ.....71...64K 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
Objects:
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RA (2000) DE Designation(s)
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03 33 23.0 +79 34 50 Pal 1 = C 0325+794
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10 44 521 CCD photometry of Pal 1
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Byte-by-byte Description of file: table10
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Identification number (Palomar 1 BS NNN)
5- 10 F6.2 pix Xpos X position (1)
12- 17 F6.2 pix Ypos Y position (1)
19- 23 F5.2 mag gmag ? g magnitude
26- 30 F5.2 mag rmag ? r magnitude
32- 36 F5.2 mag imag ? i magnitude
39- 43 F5.2 mag zmag ? z magnitude
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Note (1): 1pix=0.8arcsec. X increasing from North to South, Y from East to West.
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 12-Jun-1997