SIMBAD references

2019ApJ...871..116S - Astrophys. J., 871, 116-116 (2019/January-3)

Chandra observations of the massive star-forming region Onsala 2.

SKINNER S.L., SOKAL K.R. and GUDEL M.

Abstract (from CDS):

Previous radio and infrared observations have revealed an obscured region of high-mass star formation in Cygnus known as Onsala 2 (ON2). Within this region lies the optically revealed young stellar cluster Berkeley 87, which contains several OB stars and the rare oxygen-type Wolf-Rayet star WR 142. Previous radio studies of ON2 have also discovered masers and several H II regions excited by embedded OB stars. Radio and Gaia parallaxes have now shown that the H II regions are more distant than Berkeley 87. We summarize two Chandra X-ray observations of ON2, which detected more than 300 X-ray sources. Several optically identified stars in Berkeley 87 were detected, including massive OB stars and WR 142, the latter being a faint hard source whose X-ray emission likely arises in hot thermal plasma. Intense X-ray emission was detected near the compact H II regions G75.77+0.34 and G75.84+0.40, consisting of numerous point sources and diffuse emission. Heavily absorbed X-ray sources and their near-IR counterparts that may be associated with the exciting OB stars of the H II regions are identified. Shocked winds from embedded massive stars offer a plausible explanation of the diffuse emission. Young stellar object candidates in the ON2 region are identified using near-IR colors, but surprisingly few counterparts of X-ray sources have near-IR excesses typical of classical T Tauri stars.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): HII regions - open clusters and associations: individual: Berkeley 87 - stars: individual: WR 142 - stars: massive - X-rays: diffuse background - X-rays: stars

Status in Simbad:  being processed

Simbad objects: 27

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2019.12.11-22:52:50

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