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19 April 2024 |
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A Combined Spitzer and Chandra Survey of Young Stellar Objects in the
Serpens Cloud Core | | E. Winston
; S. T. Megeath
; S. J. Wolk
; J. Muzerolle
; R. Gutermuth
; J. L. Hora
; L.E. Allen
; B. Spitzbart
; P. Myers
; G. G. Fazio
; | | Date: |
17 Jul 2007 | | Abstract: | We present Spitzer and Chandra observations of the nearby (~260 pc) embedded
stellar cluster in the Serpens Cloud Core. We observed, using Spitzer’s IRAC
and MIPS instruments, in six wavelength bands from 3 to 70 ${mu}m$, to detect
thermal emission from circumstellar disks and protostellar envelopes, and to
classify stars using color-color diagrams and spectral energy distributions
(SEDs). These data are combined with Chandra observations to examine the
effects of circumstellar disks on stellar X-ray properties. Young diskless
stars were also identified from their increased X-ray emission. We have
identified 138 YSOs in Serpens: 22 class 0/I, 16 flat spectrum, 62 class II, 17
transition disk, and 21 class III stars; 60 of which exhibit X-ray emission.
Our primary results are the following: 1.) ten protostars detected previously
in the sub-millimeter are detected at lambda < 24 microns, seven at lambda < 8
microns, 2.) the protostars are more closely grouped than more evolved YSOs
(median separation : ~0.024 pc, and 3.) the luminosity and temperature of the
X-ray emitting plasma around these YSOs does not show any significant
dependence on evolutionary class. We combine the infrared derived values of AK
and X-ray values of NH for 8 class III objects and find that the column density
of hydrogen gas per mag of extinctions is less than half the standard
interstellar value, for AK > 1. This may be the result of grain growth through
coagulation and/or the accretion of volatiles in the Serpens cloud core. | | Source: | arXiv, arxiv.0707.2537 | | Services: | Forum | Review | PDF | Favorites | |
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