Recent, and older accurate, data on (limb-darkened) angular diameters is compiled for 221 stars, as well as BV RIJK[12][25] magnitudes for those objects, when available. Nine stars (all M-giants or supergiants) showing excess in the [12− 25] colour are excluded in the analysis as this may indicate the present of dust influencing the optical and near-infrared colours as well. Based on this large...

We examine the Fisher–Tully cz < 1000 km s galaxy sample to determine whether it is a complete and representative sample of all galaxy types, including low surface brightness populations, as has been recently claimed. We find that the sample is progressively more incomplete for galaxies with (1) smaller physical diameters at a fixed isophote and (2) lower HI masses. This is likely to lead to a ...

This paper considers some simple surface brightness (SB) estimates for galaxies in the Automated Plate Measuring Machine (APM) catalogue in order to derive homogeneous SB data for a very large sample of faint galaxies. The isophotal magnitude and area are used to estimate the central surface brightness and total magnitude based on the assumption of an exponential SB profile. The surface brightn...

We study the two dimensional surface brightness distribution of the Galactic X-ray background emission outside the central degree around Sgr A∗ in the 6.7 keV line as measured by the PCA spectrometer of the RXTE observatory. The use of the emission line instead of continuum (3–20 keV) radiation and application of time variability filtering to the long data set allows us to strongly suppress the...

A sample of about 3,800 Low Surface Brightness (LSB) galaxies was selected using the all-sky nearinfrared (J , H and Ks-band) 2MASS survey. The selected objects have a mean central surface brightness within a 5′′ radius around their centre fainter than 18 mag arcsec in the Ks band, making them the lowest surface brightness galaxies detected by 2MASS. A description is given of the relevant prope...