We present BVRI photometry of 180 bright, southern nearby-star candidates. The stars were selected from the New Luyten Two-Tenths proper motion catalogue based on optical/infrared colours, constructed by combining Luytens’s mr estimates with nearinfrared photometry from the 2-Micron All Sky Survey. Photometric parallaxes derived from (V-KS), (V-I) and (I-J) colours, combined with the limited av...

We have used an updated version of the empirically and semi-empirically calibrated BaSeL library of synthetic stellar spectra of Lejeune et al. (1997, 1998) and Westera et al. (1999) to calculate synthetic photometry in the (UBV)J (RI)C JHKLL M, HST-WFPC2, Geneva, and Washington systems for the entire set of non-rotating Geneva stellar evolution models covering masses from 0.4– 0.8 to 120–150 M...

We present a spatially resolved comparison of the stellar-mass and total-mass surface distributions of nine early-type galaxies. The galaxies are a subset of the Sloan Lens ACS survey (or SLACS; Bolton et al. 2006). The total-mass distributions are obtained by exploring pixelated mass models that reproduce the lensed images. The stellar-mass distributions are derived from population-synthesis m...

We present new infrared JHK photometry for 61 halo and disk stars around the stellar/substellar boundary. We also present new L ′ photometry for 21 of these stars and for 40 low–mass stars taken from the Leggett 1992 photometry compilation. These data are combined with available optical photometry and astrometric data to produce color–color and absolute magnitude–color diagrams — the current sa...

DIRECT is a project to directly obtain the distances to two important galaxies in the cosmological distance ladder, M31 and M33, using detached eclipsing binaries and Cepheids. As part of our search for these variables, we have obtained photometry and positions for thousands of stellar objects within the monitored fields, covering an area of 557.8 arcmin. In this research note we present the eq...

We analyze the photometry of 117 OGLE stars with periodic transit events for the presence of ellipsoidal light variations, which indicate the presence of massive companions. We find that ∼ 50% of objects may have stellar companions, mostly among the short period systems. In our Table 1 we identify a coefficient of ellipsoidal variability for each star, a c2 , which can be used to select prime c...

We present our recent revision of model constructions for the horizontal-branch (HB) morphology of globular clusters, which suggests the HB morphology is more sensitive to age compared to our earlier models. We also present our high precision CCD photometry for the classic second parameter pair M3 and M13. The relative age dating based on this photometry indicates that M13 is indeed older than ...

We have developed photometric techniques that can be applied to images with highly-variable backgrounds, as well as to slightly-extended objects (object size comparable to or smaller than PSF size). We have shown that ordinary stellar PSF-fitting photometry can be applied to slightly-extended objects, provided that one applies a systematic correction to the photometry that is a function primari...

We analyze the photometry of 121 OGLE stars with periodic transit events for the presence of ellipsoidal light variations, which indicate the presence of massive companions. We find that over 50% of objects may have stellar companions , mostly among the short period systems. In our Table 1 stars with no measurable ellipsoidal variability are marked as the prime candidates for planetary searches...

In this paper we study the properties of ten halo globular clusters in the nearby spiral galaxy M33. CCD images of M33 were obtained as a part of the BATC Colour Survey of the sky in 13 intermediate-band filters from 3800 to 10000Å. By aperture photometry, we obtain the spectral energy distributions (SEDs) of these globular clusters. We estimate the ages of our sample clusters by comparing the ...