Stellar Photometry of Cepheus C at Submillimeter Wavelengths

In Evans et al. (2018), we identified 54 candidate young stellar objects (YSOs) in the star-forming region of the Cepheus-C OB3 molecular cloud by investigating sources seen at bands from the Herschel Space Observatory. Several of the sources we knew were present from examination of other bands and from visual inspection of the Herschel data, yet did not have measured photometry in the literature. We performed aperture photometry on the Herschel data for those sources with missing measurements. Parts of Ceph-C are crowded, where aperture photometry is likely not the best method for measuring flux. In Taylor et al., (2019), we performed PSF-fitting on data from the Herschel Photoconductor Array Camera and Spectrometer (PACS) at 70 and 160 μm. We compared the PSF-fitting photometry with that from the Highly Processed Data Products (HPDP) PACS catalog to verify our procedure, then applied our methods to sources we could see in the image (and in images from other bands), but did not appear in the HPDP source list. The current project builds upon the previous PSF-fitting in this crowded region, adding points to the SEDs by using Herschel Spectral and Photometric Imaging Receiver (SPIRE) data at 250, 350, and 500 μm. The Astropy implementations of DAOPhot (Photutils) were used to do the PSF-fitting photometry. Quantitative measurements of several of these sources have not appeared in the literature prior to our work above; now we have more secure estimates of the flux densities, and can improve upon the spectral energy distributions (SEDs) we constructed in 2017-18.