Searching for massive pre-stellar cores through observations of N₂H+and N₂D+

2006/08/31 by F. Fontani, P. Caselli, A. Crapsi +4 · 2 citations
Chemistry · Physics and Astronomy · #Abundance (ecology) #Analytical Chemistry (journal) #Astro and Planetary Science #Astrophysics #Astrophysics and Star Formation Studies #Chemistry #Chromatography #Deuterium #Fractionation #High mass #Low Mass #Molecular Spectroscopy and Structure #Nuclear physics #Order (exchange) #Physics #Star (game theory) #Star formation #Stars #Stellar mass #astro-ph

paper · pdf · doi:10.1051/0004-6361:20066105

27 pages, 15 figures, accepted by Astronomy and Astrophysics

arxiv created 2006/08/31 · openalex publication_date 2006/09/13 · arxiv updated 2009/12/01 · openalex created_date 2020/05/01 · openalex updated_date 2026/08/05

Abstract

Aims.We have measured the deuterium fractionation and the CO depletion factor (ratio between expected and observed CO abundance) in a sample of high-mass protostellar candidates, in order to understand whether the earliest evolutionary stages of high-mass stars have chemical characteristics similar to those of low-mass ones. It has been found that low-mass starless cores on the verge of star formation have large values both of the column density ratio and of the CO depletion factor.

Citations

• The size distribution of interstellar grains
• Molecular Evolution in Collapsing Prestellar Cores. III. Contraction of a Bonnor‐Ebert Sphere
• Molecular Ions in L1544. II. The Ionization Degree
• Search for massive protostellar candidates in the southern hemisphere
• Freeze-out and coagulation in pre-protostellar collapse
• The circumstellar environments of high-mass protostellar objects

Cited by

• Deuterium fractionation and the degree of ionisation in massive clumps within infrared dark clouds
• Absolute positions of 6.7-GHz methanol masers