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HD 21191


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CN column densities and excitation temperatures
We analyse abundances and rotational temperatures of the interstellar CNmolecule. We have calculated the column densities and excitationtemperatures of the molecule along 73 lines of sight basing on ouroriginal measurements of the B 2?+ -X2?+ (0,0) vibrational band recorded in highsignal-to-noise ratio spectra and also for 88 directions based onmeasurements already available in literature. We compare the columndensities obtained from different bands of CN molecule available toground-based instruments. The obtained excitation temperatures in theanalysed directions show always an excess over the cosmic microwavebackground radiation (CMBR) temperature.

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Observation and Astrometry data

Constellation:Cassiopeia
Right ascension:03h32m24.80s
Declination:+76°37'02.7"
Apparent magnitude:8.418
Distance:336.7 parsecs
Proper motion RA:-7.7
Proper motion Dec:-4.3
B-T magnitude:8.625
V-T magnitude:8.436

Catalogs and designations:
Proper Names
HD 1989HD 21191
TYCHO-2 2000TYC 4509-1205-1
USNO-A2.0USNO-A2 1650-00675525
HIPHIP 16495

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