2003ApJ...592..176M -
Astrophys. J., 592, 176-187 (2003/July-3)
Neutral hydrogen associated with NGC 7129.
MATTHEWS H.E., PURTON C.R., ROGER R.S., DEWDNEY P.E. and MITCHELL G.F.
Abstract (from CDS):
Observations of the environment of the star-forming region NGC 7129 obtained with an angular resolution of 1' in the 21 cm line of H I are described. Two features of the image are extensively discussed: (1) a ring of H I emission about 30' in extent and (2) a relatively dense concentration of H I with unusually wide line profiles positionally coincident with the B star BD +65°1638. The H I ring is consistent with photodissociation of H2by the interstellar UV radiation field at the surface of an extended molecular cloud in which both BD +65°1638 and NGC 7129 are situated. We further show that BD +65°1638 appears to be an unusual example of a ``dissociating star'' surrounded by an extensive region of photodissociated H2and accompanied by a small H II region. The derived spectral type (B2.5) and the absolute magnitude for BD +65°1638 further suggest that the latter is very close to the birthline. The very young stellar age implied by the parameters of the H I region, considerably less than 104 yr, is discussed, and the properties of the H I region are compared with those of the prototype for this rare class of objects. We discuss both aspects within the context of star formation in NGC 7129.
Abstract Copyright:
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Journal keyword(s):
ISM: Atoms - ISM: Clouds - ISM: Individual: NGC Number: NGC 7129 - ISM: Reflection Nebulae - Stars: Formation - Stars: Pre-Main-Sequence
Nomenclature:
Text, Table 1: [MPR2003] HI Ring N=1, [MPR2003] HI Knot N=1.
Simbad objects:
19
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