ar X iv : a st ro - p h / 98 02 08 8 v 1 7 F eb 1 99 8 to appear in the AJ The Distance to the M 31 Globular Cluster System

ar X iv : a st ro - p h / 98 02 08 2 v 1 6 F eb 1 99 8 What is the True Covering Factor of Absorbing Matter in BALQSO ’ s ?

ar X iv : a st ro - p h / 98 02 02 7 v 1 3 F eb 1 99 8 Recalibration of Luminosity –

A recalibration of the luminosity–linewidth technique is discussed which introduces (i) new cluster calibration data, (ii) new corrections for reddening as a function of inclination, and (iii) a new zero-point calibration using 13 galaxies with distances determined via the cepheid period– luminosity method. It is found that H 0 = 82 ± 16 km s −1 Mpc −1 (95% confidence).

ar X iv : a st ro - p h / 98 02 02 8 v 1 3 F eb 1 99 8 Phase Transitions in Neutron Stars

Phase transitions in neutron stars due to formation of quark matter, kaon condensates, etc. are discussed with particular attention to the order of these transitions. Observational consequences of phase transitions in pulsar angular velocities are examined.

ar X iv : a st ro - p h / 98 02 06 9 v 1 5 F eb 1 99 8 1 Beppo - SAX Observations of Galaxy Clusters

The high spatial resolution of the MECS experiment on board Beppo-SAX has encouraged a few scientists, including the author, to perform observations of galaxy clusters. Results from the analysis of the first few observed objects are encouraging. After having reviewed the Beppo-SAX observing program for galaxy clusters and referenced contributions to these proceedings by other authors on the sam...

ar X iv : a st ro - p h / 99 02 06 2 v 1 4 F eb 1 99 9 SOURCES OF RELATIVISTIC JETS IN THE GALAXY