The Surface Population of the Serpens Molecular Cloud

Details The Surface Population of the Serpens Molecular Cloud The Surface Population of the Serpens Molecular Cloud

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0801w&link_type=abstract

American Astronomical Society, AAS Meeting #212, #8.01; Bulletin of the American Astronomical Society, Vol. 40, p.199

Astronomy and Astrophysics

Astronomy

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Scientific paper

We present optical photometry (BVR) and spectroscopy for 27 X-ray sources detected by XMM-Newton toward the Serpens star-forming region. Optical photometry was obtained using the 90prime CCD on the 2.3 meter Bok Telescope and optical spectroscopy with the multi-object spectrograph HYDRA at the WIYN 4 meter telescope, both located at Kitt Peak, AZ. Effective temperatures were derived from spectra covering the wavelength range from 624.9-765.7 nm. Line-of-sight visual extinctions were estimated using (V-R) and (J-H) photometry combined with intrinsic colors informed from the spectral types. Stellar luminosities were calculated from dereddened magnitudes combined with spectral-type-dependent bolometric corrections. H-R diagrams were constructed for the sample and compared to theoretical tracks and isochrones for pre-main sequence stars. The X-ray sources studied are found to be pre-main sequence objects and, with the exception of two early-type stars, range in mass from the hydrogen-burning limit to 0.6 M⊙. Ages range from 0.3-10 Myr with a median age of 3 Myr. This suggests we are observing an older, more evolved young stellar population than that embedded in the Serpens core. A color-magnitude diagram is presented for over 1000 objects with accurate V and R photometry indicating a significant population of pre-main sequence objects in the Serpens region.

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