Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..241p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 241-251. Research supported by AAS.
Astronomy and Astrophysics
Astronomy
24
Astronomical Spectroscopy, Infrared Cirrus (Astronomy), Molecular Clouds, Nebulae, Visible Spectrum, Astronomical Photometry, Dark Matter, Infrared Photometry, Interstellar Chemistry, Interstellar Extinction
Scientific paper
The interstellar material toward L1569 is studied in detail using combined optical and IR data. The cloud associated with the 9.0 km/s component of CO emission is seen to have N(CH) = (3.5 + or - 0.3) x 10 to 13th/sq cm and two components of atomic Na I absorption at LSR velocities of 9/0 and 22 km/s with column densities of N(Na I) = (7.3 + or - 1.3) x 10 to the 12th and (2.0 + or - 0.5) x 10 to the 11th/sq cm, respectively. Observed Ca II absorption in one direction is seen at velocities of 9.6 and 21.6 km/s, and the 21.6 km/s component has a value of N(Ca II)/N(Na I) greater than 64. Evidence for cloud heating and for an angular size of 30 arcmin for the L1569 cloud associated with the absorption toward HD 25154 is discussed. This angular size, combined with a distance estimate of 150 pc, is used to derive approximate values of d = 1.2 pc and M = 50 solar masses. The CH column density is approximately double that for dark clouds of comparable extinction in the Galactic plane.
Blades Chris J.
Crane Patrick
Danks Anthony C.
Penprase Bryan Edward
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