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An XMM-Newton observation of the Lagoon Nebula and the very young open cluster NGC 6530
Gosset, E.; Corcoran, M. F.; Blomme, R. +5 more
We report the results of an XMM-Newton observation of the Lagoon Nebula (M 8). Our EPIC images of this region reveal a cluster of point sources, most of which have optical counterparts inside the very young open cluster NGC 6530. The bulk of these X-ray sources are probably associated with low and intermediate mass pre-main sequence stars. One of …
Extragalactic globular clusters in the near infrared. I. A comparison between M87 and NGC 4478
Minniti, D.; Kissler-Patig, M.; Brodie, J. P.
We compare optical and near infrared colours of globular clusters in M87, the central giant elliptical in Virgo, and NGC 4478, an intermediate luminosity galaxy in Virgo, close in projection to M87. Combining V and I photometry obtained with the WFPC2 on HST and K_s photometry obtained with the NIRC on Keck 1, we find the broad range in colour and…
The young intermediate-mass stellar object AFGL 490 - A disk surrounded by a cold envelope
Henning, Th.; van Dishoeck, E. F.; van der Tak, F. F. S. +2 more
AFGL 490 is a key target of the class of deeply embedded intermediate-mass young stellar objects in a transition stage to Herbig Be stars (L = 2.2-4.0 x 103 Lsun ). In this paper, we present a comprehensive set of single-dish line data which characterize the envelope of the source. In addition, observations of CS J = 2->1 …
Far-infrared emission from intracluster dust in Abell clusters
Lemke, D.; Klaas, U.; Mattila, K. +1 more
The ISOPHOT instrument aboard ISO has been used to observe extended FIR emission of six Abell clusters. Strip scanning measurements with crossing position angles centered on the clusters were carried out at 120 µ m and 180 µ m. The raw profiles of the I120 µ m/I180 µ m surface brightness ratio includin…
Spectral analysis of the sdO K 648 , the exciting star of the planetary nebula Ps 1 in the globular cluster M 15 (NGC 7078 )
Rauch, T.; Werner, K.; Heber, U.
We present a spectral analysis of the sdO central star
Abundant molecular gas in the intergalactic medium of Stephan's Quintet
Duc, P. -A.; Braine, J.; Charmandaris, V. +3 more
Stephan's Quintet (SQ) is a system consisting of at least four interacting galaxies which is well known for its complex dynamical and star formation history. It possesses a rich intergalactic medium (IGM), where hydrogen clouds, both atomic and molecular, associated with two starbursts (refered to as SQ A and B) have been found. In order to study …
Study of the Per OB2 star forming complex. II. Structure and kinematics
Scholz, R. -D.; Piskunov, A. E.; Kharchenko, N. V. +2 more
The study of a sky area with a 20 degree diameter centered on the nearby association Per OB2 has been carried out on the basis of the ``Compiled Catalogue of Astronomical Data in the Per OB2 Field'' presented in a previous paper. The catalogue contains about 30 000 stars with accurate proper motions in the Hipparcos system as well as magnitudes su…
A photoionization model of the compact H II region G29.96-0.02
Morisset, C.; Schaerer, D.; Cox, P. +5 more
We present a detailed photoionization model of G29.96-0.02 (hereafter G29.96), one of the brightest Galactic Ultra Compact H Ii (UCHII) regions in the Galaxy. This source has been observed extensively at radio and infrared wavelengths. The most recent data include a complete ISO (SWS and LWS) spectrum, which displays a remarkable richness in atomi…
Non-radial pulsation, rotation and outburst in the Be star omega Orionis from the MuSiCoS 1998 campaign
Stahl, O.; Kaper, L.; Smartt, S. J. +26 more
Young massive stars in the ISOGAL survey. II. The catalogue of bright YSO candidates
Felli, M.; Omont, A.; Testi, L. +1 more
The 7 and 15 mu m observations of selected fields in the Galactic Plane obtained with ISOCAM during the ISOGAL program offer a unique possibility to search for previously unknown YSOs, undetected by IRAS because of lower sensitivity or confusion problems. In a previous paper (Felli et al. \cite{FCTOS00}) we established criteria of general validity…