Results 271 to 280 of about 6,154 (302)

Young stellar objects in groups.

1994
The authors present four groups which contain several massive young objects in different evolutionary states, mainly Herbig Ae/Be stars and compact H II regions. They try to ascertain the exact nature of the components of the group, via photometry and spectroscopy. This study is illustrated by the case of AFGL 4029.
Deharveng, L., Zavagno, Annie, Caplan, J.   +2 more
openaire   +1 more source

ISO spectroscopy of young stellar objects [PDF]

, 1999
Observations of gas-phase and solid-state species toward young stellar objects (YSOs) with the spectrometers on board the Infrared Space Observatory are reviewed. The excitation and abundances of the atoms and molecules are sensitive to the changing
Dishoeck, E.F., Black, J.H., Boogert, A.C.A., Boonman, A.M.S., Ehrenfreund, P., Gerakines, P.A., de Graauw, Th., Helmich, F.P., Keane, J.V., Lahuis, F., Schutte, W.A., Tielens, A.G.G.M., Whittet, D.C.B., Wright, C.M., van den Ancker, M.E., Blake, G.A., Creech-Eakman, M., Waters, L.B.F.M., Wesselius, P.R.   +18 more
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Radio Activity In Young Stellar Objects

1999
Magnetic activity phenomena as radio and X-ray flares are characteristic for young stellar objects (cf. Montmerle 1991). These phenomena are expected (e.g. Andre 1996; Hayashi et al. 1996) to be comparable to solar coronal flares. However, the plasma parameter regime in the YSO-context is totally different from the one of the solar corona.
G. T. Birk, H. Wiechen
openaire   +1 more source

Magnetic fields in young stellar objects

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
The formation of stars and planets is accompanied not only by inflows of matter, as one might expect, but also by outflows. These outflows take the form of supersonic and highly collimated jets that can stretch for several light years and extend even beyond the parent molecular cloud.
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Dust Around Young Stellar Objects

1996
In this paper, the properties of circumstellar dust grains located in the environment of young stellar objects will be reviewed. After a short introduction to the field of young stellar objects, the main results of infrared spectroscopy will be discussed. Infrared and millimetre continuum observations form a further topic of this paper.
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Detection of young stellar objects with ISO

1997
Preliminary 15μm results obtained with ISOCAM are compared with deep K-band and H_2_O maser observations of a 0.244deg^2^ field in the galactic plane at I=+45^o^. A new maser source is found to be associated with the infrared source with the largest colour index, (m_K_-m_15μm_)>=10, most probably a young star in its earliest evolutionary phase ...
Testi L, Felli M, Omont A, Perault M, Seguin P, Comoretto G, Gilmore G   +6 more
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Influence of Poloidal Magnetic Field on the Parameters and Dynamics of a Plasma Flow Generated in a Plasma-Focus Discharge in a Laboratory Simulation of Jets from Young Stellar Objects

Astronomy Reports, 2023
V I Krauz, A M Kharrasov, V V Myalton
exaly  

The quest for evolutionarydiagrams of young stellar objects

2007
Young stellar objects (YSOs) are reviewed with an emphasis on their global evolutionary properties. The main classification schemes of YSOs based on the observed continuum spectral energy distributions and the recent suggestion of using a bolometric temperature to characterize the evolutionary status of all YSOs will be first discussed.
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Chemistry in the Winds of Young Stellar Objects

1998
Abstract The realization that powerful winds accompany the formation of stars has played an important role in understanding how stars form (e.g. Shu, Adams and Lizano 1987; Lada and Shu 1990). Although considerable evidence for mass loss from young stellar objects (YSOs) existed before 1980, the discovery of bipolar molecular outflows
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Protoplanetary disks around young stellar and substellar objects in the $${\sigma }$$ Orionis cluster

Journal of Astrophysics and Astronomy, 2023
Belinda Damian, Jessy JOSÉ, Beth A Biller   +2 more
exaly