Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-20
Astrophys.J. 567 (2002) 423-433; Erratum-ibid. 580 (2002) 626
Astronomy and Astrophysics
Astrophysics
12 pages, 10 figures, accepted for publication in ApJ
Scientific paper
10.1086/338381
We observed the Monoceros R2 molecular cloud with the ACIS-I array onboard the Chandra X-ray Observatory. From the central 3.2' x 3.2' region, we detect 154 sources above the detection limit of ~5x10^-16 ergs s^-1 cm^-2 with a 100 ks-exposure. About 85% of the X-ray sources are identified with an infrared counterpart, including four high mass stars in zero age main sequence (ZAMS) and/or pre main sequence (PMS) phase. The X-ray spectra of the high mass ZAMS and PMS stars are represented with a thin thermal plasma model of a temperature above 2 keV. The X-rays are time-variable and exhibit rapid flares. These high temperature plasma and flaring activity are similar to those seen in low mass PMS stars and contrary to the behavior observed in high mass main sequence stars. The X-ray luminosity increases as the intrinsic K-band flux increases. However, the X-ray luminosity saturates at a level of ~10^31 ergs s^-1. We conclude that high mass ZAMS and PMS emit X-rays, possibly due to the magnetic activity like those of low mass stars.
Hamaguchi Kenji
Kohno Makoto
Koyama Katsuji
No associations
LandOfFree
Chandra Observations of High Mass Young Stellar Objects in the Monoceros R2 molecular cloud does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chandra Observations of High Mass Young Stellar Objects in the Monoceros R2 molecular cloud, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra Observations of High Mass Young Stellar Objects in the Monoceros R2 molecular cloud will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-29141