Zobrazeno 1 - 10
of 116
pro vyhledávání: '"A. Crapsi"'
Autor:
Geers, V. C., van Dishoeck, E. F., Pontoppidan, K. M., Lahuis, F., Crapsi, A., Dullemond, C. P., Blake, G. A.
PAHs have been detected toward molecular clouds and some young stars with disks, but have not yet been associated with embedded young stars. We present a sensitive mid-IR spectroscopic survey of PAH features toward a sample of low-mass embedded YSOs.
Externí odkaz:
http://arxiv.org/abs/0812.3664
Autor:
Caselli, Paola, Vastel, Charlotte, Ceccarelli, Cecilia, van der Tak, Floris, Crapsi, Antonio, Bacmann, Aurore
We present a survey of the ortho-H2D+(1_{1,0}-1_{1,1}) line toward a sample of 10 starless cores and 6 protostellar cores, carried out at the Caltech Submillimeter Observatory. The high diagnostic power of this line is revealed for the study of the c
Externí odkaz:
http://arxiv.org/abs/0809.2803
Autor:
Dunham, Michael M., Crapsi, Antonio, Evans II, Neal J., Bourke, Tyler L., Huard, Tracy L., Myers, Philip C., Kauffmann, Jens
We present a search for all embedded protostars with internal luminosities < 1 solar luminosity in the sample of nearby, low-mass star-forming regions surveyed by the Spitzer Space Telescope c2d Legacy Project. The internal luminosity (Lint) of a sou
Externí odkaz:
http://arxiv.org/abs/0806.1754
(Abridged) Classification schemes for YSOs are based on evaluating the degree of dissipation of the surrounding envelope, whose main effects are the extinction of the optical radiation from the central YSO and re-emission in the far-infrared. Since e
Externí odkaz:
http://arxiv.org/abs/0801.4139
(abbreviated) We aim to determine the masses of the envelopes, disks, and central stars of young stellar objects (YSOs) in the Class I stage. We observed the embedded Class I objects IRS 63 and Elias 29 in the rho Ophiuchi star-forming region with th
Externí odkaz:
http://arxiv.org/abs/0801.3569
Autor:
Boogert, A., Pontoppidan, K., Knez, C., Lahuis, F., Kessler-Silacci, J., van Dishoeck, E., Blake, G., Augereau, J., Bisschop, S., Bottinelli, S., Brooke, T., Brown, J., Crapsi, A., Evans II, N., Fraser, H., Geers, V., Huard, T., Jorgensen, J., Oberg, K., Allen, L., Harvey, P., Koerner, D., Mundy, L., Padgett, D., Sargent, A., Stapelfeldt, K.
Publikováno v:
Astrophys.J.678:985-1004,2008
With the goal to study the physical and chemical evolution of ices in solar-mass systems, a spectral survey is conducted of a sample of 41 low luminosity YSOs using 3-38 um Spitzer and ground-based spectra. The long-known 6.0 and 6.85 um bands are de
Externí odkaz:
http://arxiv.org/abs/0801.1167
Circumstellar disks are expected to form early in the process that leads to the formation of a young star, during the collapse of the dense molecular cloud core. It is currently not well understood at what stage of the collapse the disk is formed or
Externí odkaz:
http://arxiv.org/abs/0709.3175
Abridged: The thermal structure of a starless core is crucial for our understanding of the physics in these objects and hence for our understanding of star formation. Theory predicts a gas temperature drop in the inner 5000 AU of these objects, but t
Externí odkaz:
http://arxiv.org/abs/0705.0471
We investigate the velocity transition in the low-mass protostar L1489 IRS, which is known to be embedded in a flattened, disc-like structure that shows both infall and rotation. We construct a model for L1489 IRS consisting of an flattened envelope
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610672
We have measured the deuterium fractionation (through the column density ratio N(N2D+)/N(N2H+)) and the CO depletion factor (ratio between expected and observed CO abundance) in a sample of 10 high-mass protostellar candidates, in order to understand
Externí odkaz:
http://arxiv.org/abs/astro-ph/0608702