Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341304c&link_type=abstract
American Astronomical Society, AAS Meeting #213, #413.04; Bulletin of the American Astronomical Society, Vol. 41, p.220
Astronomy and Astrophysics
Astronomy
Scientific paper
We have conducted the first near-IR spectroscopic survey of Class I protostars, observing the spectra of 114 candidate Class I YSOs from 0.8 to 2.45 microns. We have found a remarkably diverse range of spectal features. Most of the continuua appear to be from late type photosphere, based on the presence of CO and water vapor absorption bands, or dominated by veiling. However, a few spectra show an early type photosphere. Brackett gamma is the most commonly observed emission feature, seen in 65% of targets. H2 is seen in emission for 40% of targets. The H2 line ratios are most consistent with X-ray excitation. There is a weak correlation between the equivalent widths of Brackett gamma and the CO band heads, where objects with a strong Brackett gamma emission tend to have strong CO emission, and objects with strong CO absorption do not show Brackett gamma emission. We have identified 5 targets whose spectrum has broad CO and water vapor absorption features consistent with a late type star, but have none of the narrow absorption lines of a late type star. We have also found that the spectra of Class I protostars are highly variable, with nearly every spectrum changing within a year. Within that time, every spectral feature has been observed to change (e.g. Ca II, He I, atomic H, H2, CO, veiling). This research was funded through a fellowship to the NASA Postdoctoral Program.
Connelley Michael S.
Greene Thomas P.
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