SIMBAD references

2000ApJ...533..440G - Astrophys. J., 533, 440-453 (2000/April-2)

Does infall end before the class I stage?

GREGERSEN E.M., EVANS II N.J., MARDONES D. and MYERS P.C.

Abstract (from CDS):

We have observed HCO+ J=3-2 toward 16 class I sources and 18 class 0 sources, many of which were selected from Mardones et al.'s recent observations. Eight sources have profiles significantly skewed to the blue relative to optically thin lines. We suggest six sources as new infall candidates. We find an equal ``blue excess'' among class 0 and class I sources after combining this sample with that of Gregersen et al. We used a Monte Carlo code to simulate the temporal evolution of line profiles of optically thick lines of HCO+, CS, and H2CO in a collapsing cloud and found that HCO+ had the strongest asymmetry at late times. If a blue-peaked line profile implies infall, then the dividing line between the two classes does not trace the end of the infall stage.

Abstract Copyright:

Journal keyword(s): Stars: Formation - Stars: Pre-Main-Sequence - Submillimeter

Simbad objects: 56

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2000ApJ...533..440G and select 'bookmark this link' or equivalent in the popup menu


2021.05.13-08:16:46

© Université de Strasbourg/CNRS

    • Contact