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Molecular Abundances in B68
J. Di Francesco, M. R. Hogerheijde, W. J. Welch +1
Abundances for C18O, CS, NH3, H2CO, C3H2, and N2H+ and upper limits for the abundances of 13CO and HCO+ are derived for gas within the Bok globule B68 using our own BIMA array data…
The Serpens Star-Forming Region in HCO+, HCN, and N2H+
Michiel R. Hogerheijde
This poster presents single-dish and aperture-synthesis observations of the J=1-0 (lambda~3 mm) transitions of HCO+, HCN, and N2H+ towards the Serpens star-forming region. Jets dri…
Axi-symmetric models of ultraviolet radiative transfer with applications to circumstellar disk chemistry
Gerd-Jan van Zadelhoff, Yuri Aikawa, M. R. Hogerheijde +1
A new two-dimensional axi-symmetric ultraviolet radiative transfer code is presented, which is used to calculate photodissociation and ionization rates for use in chemistry models…
Millimeter-wave Searches for Cold Dust and Molecular Gas around T Tauri Stars in MBM 12
Michiel R. Hogerheijde, Ray Jayawardhana, Doug Johnstone +2
We report results of a sensitive search for cold dust and molecular gas in the disks around 8 T Tauri stars in the high-latitude cloud MBM 12. Interferometric observations of 3 mm…
Numerical methods for non-LTE line radiative transfer: Performance and convergence characteristics
G. -J. van Zadelhoff, C. P. Dullemond, F. F. S. van der Tak +7
Comparison is made between a number of independent computer programs for radiative transfer in molecular rotational lines. The test models are spherically symmetric circumstellar e…
Abundances of Molecular Species in Barnard 68
James Di Francesco, Michiel R. Hogerheijde, William J. Welch +1
Abundances for 5 molecules (C18O, CS, NH3, H2CO, and C3H2) and 1 molecular ion (N2H+) and upper limits for the abundances of 1 molecule (13CO) and 1 molecular ion (HCO+) are derive…