Two Distant Embedded Clusters in the Outer Galaxy

Details Two Distant Embedded Clusters in the Outer Galaxy Two Distant Embedded Clusters in the Outer Galaxy

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...540l..87s&link_type=abstract

The Astrophysical Journal, Volume 540, Issue 2, pp. L87-L90.

Astronomy and Astrophysics

Astronomy

17

Ism: Clouds, Galaxy: Open Clusters And Associations: General, Stars: Formation, Stars: Individual: Alphanumeric: Iras 07255-2012, Stars: Pre-Main-Sequence

Scientific paper

We report the discovery of two distant embedded young stellar clusters located far in the outer Galaxy. The clusters are resolved in near-infrared images and seen as enhancements in the surface density of IR-excess stars centered close to IRAS 07255-2012. The clusters are embedded in a molecular cloud containing a CS dense core. The molecular cloud, as traced by CO (J=1-0) is elongated and extends over a region of 15×6 pc2. From the millimeter observations, we derive a kinematic distance of 10.2 kpc and a Galactocentric distance of 16.5 kpc, making these clusters among the most distant embedded clusters in the Galaxy. The main (richer) cluster is well confined to a region of about 1.2 pc in radius. Down to our detection limit of about 1-2 Msolar at this distance, it contains at least 30 members. The smaller cluster contains at least five stars. They all exhibit near-infrared color excesses consistent with young stellar objects having circumstellar and/or envelope material. We estimate that the star formation efficiency of this molecular cloud is about 4%-10%.

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