Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Doty, Steven"'
(Abridged) Context. With the Herschel Space Observatory, lines of simple molecules (C+, O, and CO) have been observed in the atmosphere of protoplanetary disks. When combined with ground-based [CI], all principle forms of carbon can be studied. The a
Externí odkaz:
http://arxiv.org/abs/1201.4860
The chemical composition of a protoplanetary disk is determined not only by in situ chemical processes during the disk phase, but also by the history of the gas and dust before it accreted from the natal envelope. In order to understand the disk's ch
Externí odkaz:
http://arxiv.org/abs/1107.2075
The Herschel Space Observatory opens the sky for observations in the far infrared at high spectral and spatial resolution. A particular class of molecules will be directly observable; light diatomic hydrides and their ions (CH, OH, SH, NH, CH+, OH+,
Externí odkaz:
http://arxiv.org/abs/1007.3261
Publikováno v:
Astrophys.J.700:872-886,2009
Observations of the high-mass star forming region AFGL 2591 reveal a large abundance of CO+, a molecule known to be enhanced by far UV (FUV) and X-ray irradiation. In chemical models assuming a spherically symmetric envelope, the volume of gas irradi
Externí odkaz:
http://arxiv.org/abs/0906.0588
Publikováno v:
Astrophys.J.Supp.183:179-196,2009
Upcoming facilities such as the Herschel Space Observatory or ALMA will deliver a wealth of molecular line observations of young stellar objects (YSOs). Based on line fluxes, chemical abundances can then be estimated by radiative transfer calculation
Externí odkaz:
http://arxiv.org/abs/0906.0584
Publikováno v:
Astrophys.J.698:1341-1356,2009
We model the thermal effect of young stars on their surrounding environment in order to understand clustered star formation. We take radiative heating of dust, dust-gas collisional heating, cosmic-ray heating, and molecular cooling into account. Usin
Externí odkaz:
http://arxiv.org/abs/0710.3906
We discuss the effects of an enhanced interstellar radiation field (ISRF) on the observables of protostellar cores in the Orion cloud region. Dust radiative transfer is used to constrain the envelope physical structure by reproducing SCUBA 850 micron
Externí odkaz:
http://arxiv.org/abs/astro-ph/0512314
Autor:
Doty, Steven D., Everett, Sheila E., Shirley, Yancy L., Evans II, Neal J., Palotti, Matthew L.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 359 (2005) 228-236
A series of self-consistent, three-dimensional continuum radiative transfer models are constructed of the pre-protostellar core L1544, with the results compared with existing SCUBA and ISO data. The source is well-fit by a prolate spheroid, having an
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501676
Publikováno v:
Astrophys.J. 614 (2004) 252-266
We present maps of the 6 cm and 1.3 mm transitions of formaldehyde toward three cold, dense pre-protostellar cores: L1498, L1512, and L1544. The 6 cm transition is a unique probe of high density gas at low temperature. However, our models unequivocal
Externí odkaz:
http://arxiv.org/abs/astro-ph/0406530
Autor:
Jabbarzadeh, Ehsan, Starnes, Trevor, Khan, Yusuf M., Jiang, Tao, Wirtel, Anthony J., Deng, Meng, Lv, Qing, Nair, Lakshmi S., Doty, Steven B., Laurencin, Cato T.
Publikováno v:
Proceedings of the National Academy of Sciences of the United States of America, 2008 Aug 01. 105(32), 11099-11104.
Externí odkaz:
https://www.jstor.org/stable/25463299
