@article {23974,
	title = {J-type carbon stars in the Large Magellanic Cloud},
	volume = {341},
	year = {2003},
	month = {2003/05/1},
	pages = {534 - 550},
	abstract = {A sample of 1497 carbon stars in the Large Magellanic Cloud (LMC) has been observed in the red part of the spectrum with the 2dF facility on the Anglo-Australian Telescope. Of these, 156 have been identified as J-type (i.e. <SUP>13</SUP>C-rich) carbon stars using a technique which provides a clear distinction between J stars and the normal N-type carbon stars that comprise the bulk of the sample, and yields few borderline cases. A simple two-dimensional classification of the spectra, based on their spectral slopes in different wavelength regions, has been constructed and found to be related to the more conventional c and j indices, modified to suit the spectral regions observed. Most of the J stars form a photometric sequence in the K- (J-K) colour-magnitude diagram, parallel to and 0.6 mag fainter than the N-star sequence. A subset of the J stars (about 13 per cent) are brighter than this J-star sequence; most of these are spectroscopically different from the other J stars. The bright J stars have stronger CN bands than the other J stars and are found strongly concentrated in the central regions of the LMC. Most of the rather few stars in common with Hartwick and Cowley{\textquoteright}s sample of suspected CH stars are J stars. Overall, the proportion of carbon stars identified as J stars is somewhat lower than has been found in the Galaxy. The Na D lines are weaker in the LMC J stars than in either the Galactic J stars or the LMC N stars, and do not seem to depend on temperature.},
	keywords = {Astrophysics, Magellanic Clouds, Stars: carbon},
	isbn = {0035-8711},
	url = {https://ui.adsabs.harvard.edu/abs/2003MNRAS.341..534M},
	author = {Morgan, D. H. and Cannon, R. D. and Hatzidimitriou, D. and Croke, B. F. W.}
}
