Lunch Talks

Sarah Sadavoy, CfA
Wednesday, March 1, 2017
12:00 PM - 1:00 PM
LGRT 644
Title:
Embedded Binaries and their Dense Cores
Abstract:
Several studies have identified higher binary fractions in young, embedded systems than in their older, unembedded stellar counterparts. While these studies have characterized the binaries themselves, the properties of their parent cores and their connection to the embedded stars remains unclear. To explore the relationship between young, embedded binaries and their parent cores, we combine the uniform binary database from the VANDAM survey with core properties obtained from SCUBA-2 observations at 850 um for the Perseus molecular cloud. We show that most binary systems are found toward the centers of their parent cores, although several systems have one or more components along the core edge. We separate our systems into tight binaries ( 500 AU separations) and wide binaries ( 500 AU separations), such that the wide binaries show a preferred alignment with the semi-major axis of their parent core, whereas the tight binaries show no preferred orientations. We test a number of simple, evolutionary models to account for the observed populations of embedded stars. In the model that best explains the observations, all stars form initially as wide binaries that are allowed to break up into separate stars or shrink into tighter orbits. If our simple model provides a good fit to other star-forming regions, then the mass fraction of dense cores that become stars is double what is currently believed.

 

Star Formation Lunch  

Wednesdays at noon in LGRT 644

 

Galaxy Discussion Group

Fridays at noon in LGRT 644

For more information please see the Galaxy Discussion Group Google Doc