Mathematics – Logic
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..454r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Aug. 1991, p. 454-460. Research supported by NSERC and Ministere de l'Education
Mathematics
Logic
40
Astronomical Photometry, Quasars, Stellar Color, Stellar Luminosity, Astrometry, Charge Coupled Devices, Galactic Structure, Light Curve, Stellar Spectrophotometry
Scientific paper
The paper describes the morphological and photometric characteristics of the gravitational mirage 2237 + 0305, obtained by combining CCD frames in R and I taken with HRCam at the CFHT in a 0.4 arcsec (FWHM) observation on August 23, 1990. High S/N images of the 2237 + 0305 provided precise positions and relative magnitudes for the four brighter components and for the galaxy core, and new information on the light distribution in the lensing galaxy core was obtained. Compared with Yee's (1988) photometry, the present data show components B brighter by 0.25 mag and C fainter by 0.15 mag, while the brightness of A and D and the colors of all four images are unchanged. Possible reason for the variability trends of the four components are discussed.
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