Variable Massive YSOs in the Magellanic Clouds

Details Variable Massive YSOs in the Magellanic Clouds Variable Massive YSOs in the Magellanic Clouds

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70088v&link_type=abstract

Spitzer Proposal ID #70088

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Scientific paper

We propose to obtain well-sampled, IRAC light curves for massive YSOs in the LMC and SMC using the IRAC 3.6 and 4.5 micron channels in select star forming regions with a range of metallicity, morphology, environment and spatial scale of star formation to determine the characteristic timescales and amplitude of the infrared variability. Variability at optical and near-infrared wavelength is mostly related to the central star itself. Mid-infrared flux changes, on the other hand, are in most cases due to varying emission of the circumstellar material. Using 2-epoch SAGE-LMC data we have discovered a number of infrared-variable massive YSOs. We propose these follow-up observations in carefully selected regions, with a cadence suited to variability of YSOs in order to establish the fraction of massive YSOs that exhibit flux variations, to determine whether they are periodic or stochastic and to search for dependencies on the physical properties of the YSOs and their environments. Spitzer/IRAC is uniqely suited to carry out these accurate photometric monitoring and is the only means to do so for these targets. We will target the massive star forming regions: 30 Dor, N11, N44 in the LMC and NGC 602, NGC 346 and N83-84 in the SMC. These regions have been well studied at many other wavelengths and a number of YSOs in a wide range of evolutionary stages have been identified by various techniques.

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