Optical spectroscopy of the high-latitude cloud LYNDS 1569

Abstract

view Abstract Citations (26) References (42) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical Spectroscopy of the High-Latitude Cloud Lynds 1569 Penprase, B. E. ; Blades, J. C. ; Danks, A. C. ; Crane, P. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1990 DOI: 10.1086/169476 Bibcode: 1990ApJ...365..241P Keywords: Astronomical Spectroscopy; Infrared Cirrus (Astronomy); Molecular Clouds; Nebulae; Visible Spectrum; Astronomical Photometry; Dark Matter; Infrared Photometry; Interstellar Chemistry; Interstellar Extinction; Astrophysics full text sources ADS | data products SIMBAD (7)