S Doradus Type; Hubble-Sandage Variables

Photometric variability of LBV - candidate stars and Hubble - Sandage variables A , B , C and 2 in M 33

We present the photometric history of some Luminous Blue Variable candidate stars in M 33. The search for outbursts was made in photographic plates taken in the B band of the galaxy M 33 and cover an eight year period, 1982–1990. Twenty five plates, separated into seven groups, have been used. CCD UBV magnitudes of the star UIT003 are presented also. Only one (of 12) of the LBV candidates (UIT0...

γ Doradus Stars: Defining a New Class of Pulsating Variables

In this paper we describe a new class of pulsating stars, the prototype of which is the bright, early, F-type dwarf, γ Doradus. These stars typically have between 1 and 5 periods ranging from 0.4 to 3 days with photometric amplitudes up to 0. 1 in Johnson V . The mechanism for these observed variations is high-order, low-degree, non-radial, gravity-mode pulsation. Subject headings: Stars: varia...

Hubble ’ s Nobel Prize D . S . L .

Astronomy is not in the list of natural sciences aimed at by the Nobel awards. In spite of that, there were, throughout the 1930s until the early 1950s, effective moves by important scientists to distinguish Hubble with the Prize. A short report on these attempts is made as well as speculation on what would be the citation for the prize in view of the broad range of Hubble's scientific achievem...

on Shimony ’ s “ An Analysis of Stapp ’ s ‘ A bell - type theorem without hidden variables ’ ”

TYPE Ia SUPERNOVAE AND THE HUBBLE CONSTANT

The focus of this review is the work that has been done during the 1990s on using Type Ia supernovae (SNe Ia) to measure the Hubble constant (H0). SNe Ia are well suited for measuring H0. A straightforward maximum–light color criterion can weed out the minority of observed events that are either intrinsically subluminous or substantially extinguished by dust, leaving a majority subsample that h...