Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344212m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #442.12; Bulletin of the American Astronomical Society, Vol. 41, p.321
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a preliminary analysis of deep CCD photometry of the Galactic open star cluster IC 4651.
We seek to identify the white dwarf cluster members in order to determine the age, distance, metallicity of the star cluster and to test stellar evolutionary theory. Claver observed IC 4651 at the CTIO 4-meter telescope in Chile on May 7 - 10, 1997. The star cluster was covered by four camera fields with small overlapping regions; one field was observed each night. Long and short exposures were obtained with U, B, V, and I filters in each field. Two of the nights were photometric with subarsecond seeing, and the remaining two nights were not photometric. Stellar photometry was obtained using the DAOPHOT procedure within IRAF data reduction and analysis system. Calibrated photometry in all 4 fields was obtained using IRAF's PHOTCAL package with the DAOPHOT instrumental magnitudes and standard star fit files. We made calibrated color-magnitude diagrams and color-color diagrams in all four fields. The distance modulus was determined to be (m-M) = 10.015 magnitudes, making IC4651 approximately 1000 pc away. The V vs. V-I color-magnitude diagram of IC 4651 is bracketed by the 1.5 Gyr and 2.0 Gyr Yonsei-Yi isochrones. White dwarf candidates were determined by selecting stars near the cooling sequences for DA 0.5 and 0.9 solar-mass white dwarfs; several of these white dwarf candidates fit the cooling sequences within one standard deviation errorbars. Meshkat's research was supported by the NOAO/KPNO Research Experiences for Undergraduates (REU) Program which is funded by the National Science Foundation Research Experiences for Undergraduates Program and the Department of Defense ASSURE program through Scientific Program Order No. 3 (AST-0243875) of the Cooperative Agreement No. AST-0132798 between the Association of Universities for Research in Astronomy (AURA) and the NSF.
Claver Charles
Meshkat Tiffany
Mighell Kenneth
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