Infrared and Radio observations of a small group of protostellar objects in the molecular core, L1251-C

TL;DR

This study uses multi-wavelength observations to analyze the protostellar objects in L1251-C, revealing complex molecular distributions, identifying a potential outflow source, and illustrating low-mass cluster formation.

Contribution

It provides new multi-wavelength data on L1251-C, highlighting complex molecular abundance distributions and identifying IRS 1 as a key outflow source in a low-mass star-forming cluster.

Findings

Detection of dense envelope materials at 350 and 850 microns.

Identification of IRS 1 as the likely outflow driver.

L1251-C is an example of low-mass cluster formation.

Abstract

We present a multi-wavelength observational study of a low-mass star-forming region, L1251-C, with observational results at wavelengths from the near-infrared to the millimeter. Spitzer Space Telescope observations confirmed that IRAS 22343+7501 is a small group of protostellar objects. The extended emission to east-west direction with its intensity peak at the center of L1251A has been detected at 350 and 850 micron with the CSO and JCMT telescopes, tracing dense envelope materials around L1251A. The single-dish data from the KVN and TRAO telescopes show inconsistencies between the intensity peaks of several molecular line emission and that of the continuum emission, suggesting complex distributions of molecular abundances around L1251A. The SMA interferometer data, however, show intensity peaks of CO 2-1 and 13CO 2-1 located at the position of IRS 1, which is both the brightest source in IRAC image and the weakest source in the 1.3 mm dust continuum map. IRS 1 is the strongest candidate for the driving source of the newly detected compact CO 2-1 outflow. Over the whole region (14' by 14') of L125l-C, 3 Class I and 16 Class II sources have been detected, including three YSOs in L1251A. A comparison with the average projected distance among 19 YSOs in L1251-C and that among 3 YSOs in L1251A suggests L1251-C is an example of low-mass cluster formation, where protostellar objects are forming in a small group.