Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..352g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 1, 1986, p. 352-362.
Astronomy and Astrophysics
Astrophysics
34
Infrared Stars, Molecular Clouds, Nebulae, Pre-Main Sequence Stars, Star Formation, Emission Spectra, Herbig-Haro Objects, Peculiar Stars, Stellar Mass, Stellar Spectrophotometry
Scientific paper
The Gum nebula contains a number of small, dense molecular clouds, some of which are still producing stars of low mass. Observations are presented of three small nebulae and one peculiar emission line star which are located in or near the dust clouds Sandqvist 109 and 111. The three nebulae are each coincident with point sources in the IRAS catalog which, in each case, apparently mark the location of a very young star embedded within the dust cloud. Two nebulae, Re 4 and Re 5, were discovered in a survey by Reipurth. The third is the object HH 46, which belongs to the remarkable string of Herbig-Haro (HH) objects first described by Schwartz. A 15th mag star near the head of the Re 4 nebula is almost certainly a foreground object and is not connected with Re 4 itself. The spectrum of Re 4 shows emission lines characteristic of HH objects superposed on a very red continuum. Re 5 shows only a red continuum with a few absorption lines. Broad emission lines in HH 46 indicates a complex velocity pattern near the associated IRAS source. The principal peculiarity of the M-type emission line dwarf is a small, jet-like appendage, with a purely emission line spectrum. Attention is directed to the likelihood that star formation is being observed here under highly simplified circumstances. Such examples are likely to be especially amenable to the study both of the initial conditions for star birth and of the subsequent evolution of the resulting star.
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