SIMBAD references

2002AJ....124.3387H - Astron. J., 124, 3387-3392 (2002/December-0)

Millimeter-wave searches for cold dust and molecular gas around T Tauri stars in MBM 12.


Abstract (from CDS):

We report results of a sensitive search for cold dust and molecular gas in the disks around eight T Tauri stars in the high-latitude cloud MBM 12. Interferometric observations of 3 mm continuum emission in five fields containing six of the objects and literature values for the remaining two limit the disk masses to Mdisk<0.04-0.09 M(gas plus dust), for a gas-to-dust mass ratio of 100 and a distance of 275 pc. By co-adding the 3 mm data of our five fields, we set an upper limit to the average disk mass of M{d1}disk(N=5)<0.03 M. Simultaneous observation of the CS J=2-1 and the N2H+ 1-0 lines show no emission. Single-dish observations of the 13CO 2-1 line limit the disk mass to (5-10)x10–4 Mfor a standard CO abundance of 2x10–4. Depletion of CO by up to 2 orders of magnitude through freezing out or photodissociation can reconcile these limits. These mass limits lie within the range found in the Taurus-Auriga and ρ Oph star-forming regions (0.001-0.3 M) and preclude conclusions about possible decrease in disk mass over the 1-2 Myr age range spanned by the latter two regions and MBM 12. Our observations can exclude the presence in MBM 12 of T Tauri stars with relatively bright and massive disks such as T Tau, DG Tau, and GG Tau.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - ISM: Clouds - ISM: Individual: Alphanumeric: MBM 12 - Stars: Formation - Stars: Pre-Main-Sequence

Simbad objects: 19

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