Optical spectroscopy of the high-latitude cloud Lynds 1569

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169476· OSTI ID:6159408

Penprase, B E; Blades, J C; Danks, A C; Crane, P ^[1]

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1. Space Telescope Science Institute, Baltimore, MD (USA) Applied Research Corp., Landover, MD (USA) European Southern Observatory, Garching (Germany, F.R.)

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. 49 refs.

• OSTI ID: 6159408
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 365; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
CHEMISTRY
COSMIC GASES
COSMOCHEMISTRY
DENSITY
DISTANCE
ELECTROMAGNETIC RADIATION
FLUIDS
GASES
HEATING
INFRARED RADIATION
INFRARED SPECTRA
INTERSTELLAR SPACE
MASS
MOLECULES
NEBULAE
NONLUMINOUS MATTER
PHOTOMETRY
PHYSICAL PROPERTIES
RADIATIONS
SIZE
SPACE
SPECTRA
SPECTROSCOPY
VISIBLE SPECTRA