Revised MK spectral classification of the red carbon stars

1993 ◽  
Vol 105 ◽  
pp. 905 ◽  
Author(s):  
Philip C. Keenan
Keyword(s):  
Spectral Classification ◽  
Carbon Stars

Note on the spectral classification of carbon stars in the photographic infrared region

1966 ◽  
Vol 24 ◽  
pp. 21-23
Author(s):  
Y. Fujita
Keyword(s):  
Infrared Region ◽  
Spectral Classification ◽  
Carbon Stars

We have investigated the spectrograms (dispersion: 8Å/mm) in the photographic infrared region fromλ7500 toλ9000 of some carbon stars obtained by the coudé spectrograph of the 74-inch reflector attached to the Okayama Astrophysical Observatory. The names of the stars investigated are listed in Table 1.

scholarly journals The Carbon-rich Dust Sequence: Infrared Spectral Classification of Carbon Stars

1998 ◽  
Vol 115 (2) ◽  
pp. 809-820 ◽  
Author(s):  
G. C. Sloan ◽  
I. R. Little-Marenin ◽  
S. D. Price
Keyword(s):  
Spectral Classification ◽  
Carbon Stars ◽  
Infrared Spectral

Note on the Spectral Classification of Carbon Stars in the Infrared.

1950 ◽  
Vol 111 ◽  
pp. 199 ◽  
Author(s):  
J. J. Nassau ◽  
A. Colacevich
Keyword(s):  
Spectral Classification ◽  
Carbon Stars

scholarly journals COMMISSION 45: SPECTRAL CLASSIFICATION

2008 ◽  
Vol 4 (T27A) ◽  
pp. 228-235
Author(s):  
Sunetra Giridhar ◽  
Richard O. Gray ◽  
Christopher J. Corbally ◽  
Coryn A. L. Bailer-Jones ◽  
Laurent Eyer ◽  
...  
Keyword(s):  
White Dwarfs ◽  
General Assembly ◽  
Spectral Classification ◽  
Carbon Stars ◽  
Princeton University

This report gives an update of developments (since the last General Assembly at Prague) in the areas that are of relevance to the commission. In addition to numerous papers, a new monograph entitled Stellar Spectral Classification with Richard Gray and Chris Corbally as leading authors will be published by Princeton University Press as part of their Princeton Series in Astrophysics in April 2009. This book is an up-to-date and encyclopedic review of stellar spectral classification across the H-R diagram, including the traditional MK system in the blue-violet, recent extensions into the ultraviolet and infrared, the newly defined L-type and T-type spectral classes, as well as spectral classification of carbon stars, S-type stars, white dwarfs, novae, supernovae and Wolf-Rayet stars.

scholarly journals The Spectral Classification of Southern Carbon Stars

1973 ◽  
Vol 50 ◽  
pp. 96-108
Author(s):  
P. M. Rybski
Keyword(s):  
South Africa ◽  
Research Center ◽  
Spectral Classification ◽  
Carbon Stars ◽  
The Third ◽  
Objective Prism ◽  
Astronomical Research ◽  
The One

Well-widened objective prism spectra of carbon stars south of −25° declination have been examined to determine their suitability for classification. These spectra, taken by Henize in the early 1950's from South Africa as part of the Michigan-Mt. Wilson Hα survey of the southern sky, have a reciprocal dispersion at Na I 5890 Å of 300 Å mm−1 and are in good focus in the range between 5100 and 6600 Å.Compared with spectra of northern carbon stars taken by the writer at the Lindheimer Astronomical Research Center with the one meter reflecting telescope and Cassegrain spectrograph at a grating reciprocal dispersion of 263 Å mm-1, and compared with spectra taken by Sanford of carbon stars overlapping the Henize sample, the objective prism spectra have been found of sufficient quality to support their classification into five groups following the scheme as proposed by Keenan and Morgan in 1941 and as refined by Gordon in 1967.The first group exhibit weak C2 and CN features and Hα in absorption; the second, features attributable to a low C12/C13 ratio; the third, strong C2 and CN features and only moderately strong Na i in absorption; the fourth, very strong Na i in absorption; and the fifth, Hα in emission. Examples are given of each group, stars not fitting well into any of these groups are discussed, and the significance of each group is mentioned in light of work by Bouigue, Gordon, Peery, and Richer.

Spectral Classification of Faint Carbon Stars

2003 ◽  
Vol 12 (3) ◽  
Author(s):  
I. Eglitis ◽  
M. Eglite ◽  
A. Balklavs
Keyword(s):  
Spectral Region ◽  
Spectral Classification ◽  
Carbon Stars ◽  
N Classification ◽  
New Criteria

AbstractR-N classification of 187 faint carbon stars is based on the classical criteria adjusted to the yellow-red spectral region, with two new criteria added - the ratios of the red CN bands 6206/6332 (Å) and 6478/6631 (Å).

scholarly journals The Problem of Spectral Classification of Stars in the Sequence S-SC-C

1979 ◽  
Vol 47 ◽  
pp. 39-50 ◽  
Author(s):  
Patricia C. Boeshaar ◽  
Philip C. Keenan
Keyword(s):  
Spectral Classification ◽  
Carbon Stars ◽  
Abundance Index ◽  
The Right

AbstractThe sequence of stars starting with type S and extending through the SC stars into the red carbon stars are brought into the following revised system of classification:In this table X stands for the temperature type and the number to the right of the slant line is an abundance index which, as suggested by Ake (1978), is essentially a measure of C/O. Intensities of ZrO and TiO are given also.

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