Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286..609m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 15, 1984, p. 609-629. NSF-supported research.
Astronomy and Astrophysics
Astronomy
97
H Lines, Infrared Stars, Nebulae, Stellar Spectrophotometry, Charge Coupled Devices, Infrared Astronomy, Infrared Spectrophotometers, Interstellar Extinction, Paschen Series
Scientific paper
The results of scans of 13 compact objects in the spectral region 0.6-1 micron are reported. The data were gathered using CCD detectors with 20 A resolution directed at the embedded IR sources. The survey was performed on five nights in 1982-83 with the double spectrograph on the Hale 5 m telescope. The objects observed were GL 490, GL 437S, GL 961, GL 434W, IC 2848A, S106/IRS3, M17/IRS1, S235G, M8E, 297, MW7 349, V645 Cyg, and the fan nebula region of GL989. All the objects displayed extreme reddening and Paschen series hydrogen emission lines, with several displaying O I and CA II triplet lines. The characteristics were similar to other sources with IR excess, suggesting similar physical phenomena. The 1 micron continuum possible arises from scattering and circumstellar shell emission contributions. O I lines are associated with Lyman beta fluorescence. The presence of singly ionized Ca II emissions suggests that the effective temperatures of the regions are no more than 5000 K.
Cohen Judith Gamora
McGregor Peter J.
Persson Eric S.
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