Molecular line observations of a comet-shaped cloud (LBN 437) in the Lacerta OB1 association

Details Molecular line observations of a comet-shaped cloud (LBN 437) in the Lacerta OB1 association Molecular line observations of a comet-shaped cloud (LBN 437) in the Lacerta OB1 association

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290..235o&link_type=abstract

Astronomy and Astrophysics 290, 235-244 (1994)

Astronomy and Astrophysics

Astrophysics

11

Ism: Clouds, Lbn 437, Molecules, Stars: Formation, Radio Lines: Ism

Scientific paper

Two prominent nuclei of a large, comet-like (10 pc in length) dust and gas complex, located in the Lacerta Constellation (l~96deg, b~-15deg), have been observed in molecular lines of CO, NH_3_ and H_2_CO. We will refer to the whole system as the LBN 437 complex. It lies at the edge of the youngest subgroup of the Lac OB1 association and is associated with this young group of stars. The cometary head, condensation A, contains reflection nebulae and a group of faint LkHα stars, among them LkHα 233. H_2_CO(1_11_-1_10_) ^13^CO(1-0) and (2-1) line maps show an elongated configuration of size ~2x0.5pc and a mass of 150-300Msun_xNH_3_(1,1) and (2,2) inversion line observations of Condensation A reveal the existence of a cold (10K) and dense (3x10^4^cm^-3^) core of elliptical shape. The mass and linear dimensions of this NH_3_ clump are 15Msun_, ~0.16pc (semi-major axis) and ~0.10pc (semi-minor axis). From IRAS 60-100μm images and ^12^CO(1-0) line data, we infer dust and gas temperatures of ~37K for the surrounding low-column density, far-IR emitting material. It is concluded that Condensation A consists of a cold dense core, from which newly formed Hα emission line stars have formed. This is surrounded by a lower density envelope whose warm surface is heated externally by a nearby B star (HD 213976). Condensation B, lying near the end of the cometary "tail", was mapped in H_2_CO absorption, although NH_3_ emission lines were not detected.

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