WHILE it is now generally admitted that the spectroscopic differences between the different classes of stars are mainly due to differences of temperature, there are two widely divergent views as to ...

I. ALTHOUGH the observations made by Fraunhofer in 1814 first indicated that the spectra of stars were not all of the same character, it was the more systematic observations of Rutherfurd and Secchi ...

The following is an excerpt from The Glass Universe: How the Ladies of the Harvard Observatory Took the Measure of the Stars, by Dava Sobel. The monumental work of stellar classification known as the ...

We provide the first, in most cases, two-dimensional spectral classifications for the 42 brightest stars in Praesepe. The types agree very well with the photoelectric colors. We confirm Bidelman's ...

Take a look up at a dark night sky, and you'll find it illuminated by hundreds or even thousands of individual twinkling points of light. While they might seem, to an untrained eye, to all be the same ...

A photometric classification scheme for high-latitude blue stars is described with reference to the properties of the Strömgren uvby system, uvby photometry is presented for 94 stars from the Feige ...

What is the origin of the letters used in star classification? Why didn't astronomers use ABCD? J. HaldimanChicago, Illinois ...

I don’t really have a favorite time of year to stargaze; each season brings its own unique charms to the sky. But there is something special about summer, when the weather is milder and the Milky Way ...