Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997balta...6..105m&link_type=abstract
Baltic Astronomy, vol. 6, p. 105
Astronomy and Astrophysics
Astronomy
1
Dwarf Stars, Stellar Spectrophotometry, Carbon Stars, Stellar Color, Red Giant Stars, Stellar Motions, Near Infrared Radiation, Infrared Filters, Peculiar Stars, Error Analysis
Scientific paper
Despite estimates that the dCs may outnumber the giant Cs per unit volume, only about a dozen are known, and none has been reported in the last few years. I describe a two-pronged approach to search for more. Using six of the eight filters of the Wing NIR system, we are obtaining photometry of southern, red LHS stars having only Luyten's color types; filter 4 of the system is placed so as to be able to detect CN in carbon stars. About 200 stars have been observed, and some peculiar ones have been noted, but no new dCs have yet emerged. We are searching for proper motions among carbon stars in Stephenson's (1989) catalogue and more recent lists using the data base of digitized plate scans available at the Space Telescope Science Institute. For the V mag range 12 to 18, we can determine motions down to about 35 mas/yr with a formal error of about 10 mas/yr from the typical 30-yr epoch difference. This work in particular is discussed, and a few new DC candidates are discussed.
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