a Search for Intergalactic Stars in the Local Group

Details a Search for Intergalactic Stars in the Local Group a Search for Intergalactic Stars in the Local Group

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8350w&link_type=abstract

HST Proposal ID #8350

Computer Science

Hst Proposal Id #8350 Field Stellar Populations

Scientific paper

A profound change in our picture of the Local Group has been suggested by Blitz et al. {1998}, who argue that dex11 M{sun} of HI resides in a long filament between the Milky Way and M 31, which they identify with the HI high-velocity clouds {HVCs}. Since many HVCs are known to contain heavy elements {with a metallicity of >0.01 times solar}, a critical test of the model is to find the evolved stars within the population that produced these heavy elements. We propose to search for these stars. Since the model of Blitz et al. {1998} predicts HVC distances of >100 kpc, the stars will be faint {V>24}. However, we show that they can be found using starcounts on WFPC2 images, provided that the space density exceeds 1/1000 that in the solar neighborhood, Detecting intergalactic stars in the HI filament would allow a determination of the distance to the HVCs, and establish the presence of a completely new component of the Local Group. A negative result would allow stringent limits to be set on the number of intergalactic stars and on models for HVCs.

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