An Atlas of Stellar Spectra

  title={An Atlas of Stellar Spectra},
  author={William Wilson Morgan and Philip Childs Keenan and Edith Kellman},
THIS much-needed atlas defines a two-dimensional classification system of stellar spectra by means of a sequence of standard spectra, many of which are illustrated in the fifty-five photographic prints forming the main body of the work. The spectra were taken specially for the purpose on a small one-prism spectrograph attached to the 40-in. Yerkes refractor. The standard stars chosen, which are mostly brighter than the eighth apparent magnitude, are of types from 05 to M2, and were selected to… 

MK morphological study of Am stars at 66 Å/mm

The pseudo-luminosity effect in the metallic line A-type stars found by Abt & Morgan (1976) is confirmed in a random sample of 27 Am stars. From a morphological study of their spectra in the

A spectral atlas of λ Bootis stars

Since the discovery of λ Bootis stars, a permanent confusion about their classification can be found in literature. This group of non-magnetic, Population I, metal-poor A to F-type stars, has

Automated unsupervised classification of the Sloan Digital Sky Survey stellar spectra using k-means clustering

(Abridged) This paper explores the use of k-means clustering as a tool for automated unsupervised classification of massive stellar spectral catalogs. The classification criteria are defined by the

The λ Boo and Related Stars

The main properties of this class of rare objects are described, and the criteria selected for discovering new members are indicated. The abundance anomalies, resulting from the scanty analyses made

A spectral classification system for Hydrogen-deficient carbon stars

Stellar spectral classification has been highly useful in the study of stars. While there is a currently accepted spectral classification system for carbon stars, the subset of Hydrogen-deficient

The Properties of Main-Sequence Stars from HIPPARCOS Data

We received a sample of 6840 Hipparcos stars south of declination 26 that (i) have MK spectral types in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of

Spectrographic study of the eclipsing binary system SZ Camelopardalis

Thirteen high-dispersion spectrographs of the eclipsing binary star SZ Cam have been studied with a view of determining more accurate information on: (i) the spectral type and luminosity

Classification of O Stars in the Yellow-Green: The Exciting Star VES 735

Acquiring data for spectral classification of heavily reddened stars using traditional criteria in the blue-violet region of the spectrum can be prohibitively time consuming using small to medium

A spectroscopic study of a large sample of L/T transition brown dwarfs

In this thesis I present the spectroscopic analysis of a large sample of L and T dwarfs, in order to constrain the sub-stellar initial mass function and formation history. The main points I tried to

The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification

We present near-infrared spectra for a sample of T dwarfs, including 11 new discoveries made using the 2 Micron All Sky Survey. These objects are distinguished from warmer (L-type) brown dwarfs by