Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2211d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2211-2225.
Astronomy and Astrophysics
Astronomy
10
Infrared Astronomy, Protostars, Speckle Interferometry, Stellar Envelopes, Accretion Disks, Star Formation
Scientific paper
1D speckle interferometric techniques are employed in the NIR wavelength range of 1.25 to 4.8 microns to ascertain the morphology of 18 young stellar objects not known to have associated companions. We find that three of these objects are resolved as core/halo distributions or are partially resolved with a high level of confidence. Five other sources probably show some structure although the confidence level is lower. The ten remaining sources either show evidence for very small angular scale structure or are unresolved with an upper limit of about 0.2 arcsec. Our results are compared to other published angular size data. A relationship between the 12 to 25 micron spectral slope and the physical extent of the material in the near infrared is discovered and compared to simple models. We interpret this relationship as an indication that the effective scale size of circumstellar matter surrounding young stellar objects decreases with advancing age.
DeWarf Laurence E.
Dyck Mel H.
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