scholarly journals Atlas of low-mass young stellar object disks from mid-infrared interferometry

2015 ◽  
Vol 11 (S315) ◽  
Author(s):  
J. Varga ◽  
P. Ábrahám ◽  
Th. Ratzka ◽  
J. Menu ◽  
K. Gabányi ◽  
...  
Keyword(s):  
Circumstellar Disks ◽  
Stellar Object ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Mid Infrared ◽  
Young Stellar Object ◽  
Low Mass ◽  
Infrared Interferometry

AbstractWe present our approach of visibility modeling of disks around low-mass (< 2 M⊙) young stellar objects (YSOs). We compiled an atlas based on mid-infrared interferometric observations from the MIDI instrument at the VLTI. We use three different models to fit the data. These models allow us to determine overall sizes (and the extent of the inner gaps) of the modeled circumstellar disks.

scholarly journals A wide survey for circumstellar disks in the Lupus complex

2020 ◽  
Vol 642 ◽  
pp. A86
Author(s):  
P. S. Teixeira ◽  
A. Scholz ◽  
J. Alves
Keyword(s):  
Three Dimensional ◽  
Circumstellar Disks ◽  
Young Stellar Objects ◽  
Dimensional Structure ◽  
Spectral Energy ◽  
Mass Star ◽  
Nearby Star ◽  
Stellar Objects ◽  
Star Forming ◽  
Low Mass

Previous star formation studies have, out of necessity, often defined a population of young stars confined to the proximity of a molecular cloud. Gaia allows us to examine a wider, three-dimensional structure of nearby star forming regions, leading to a new understanding of their history. We present a wide-area survey covering 494 deg2 of the Lupus complex, a prototypical low-mass star forming region. Our survey includes all known molecular clouds in this region as well as parts of the Upper Scorpius and Upper Centaurus Lupus (UCL) groups of the Sco-Cen complex. We combine Gaia DR2 proper motions and parallaxes as well as ALLWISE mid-infrared photometry to select young stellar objects (YSOs) with disks. The YSO ages are inferred from Gaia color-magnitude diagrams, and their evolutionary stages from the slope of the spectral energy distributions. We find 98 new disk-bearing sources. Our new sample includes objects with ages ranging from 1 to 15 Myr and masses ranging from 0.05 to 0.5 M⊙, and consists of 56 sources with thick disks and 42 sources with anemic disks. While the youngest members are concentrated in the clouds and at distances of 160 pc, there is a distributed population of slightly older stars that overlap in proper motion, spatial distribution, distance, and age with the Lupus and UCL groups. The spatial and kinematic properties of the new disk-bearing YSOs indicate that Lupus and UCL are not distinct groups. Our new sample comprises some of the nearest disks to Earth at these ages, and thus provides an important target for follow-up studies of disks and accretion in very low mass stars, for example with ALMA and ESO-VLT X-shooter.

scholarly journals Mid-infrared interferometry of massive young stellar objects

2008 ◽  
Vol 131 ◽  
pp. 012024 ◽  
Author(s):  
H Linz ◽  
B Stecklum ◽  
R Follert ◽  
Th Henning ◽  
R van Boekel ◽  
...  
Keyword(s):  
Young Stellar Objects ◽  
Stellar Objects ◽  
Mid Infrared ◽  
Infrared Interferometry

Instability of anomalous viscosity disks around young stellar objects

2007 ◽  
Vol 73 (3) ◽  
pp. 367-375 ◽  
Author(s):  
Z. R. YAO ◽  
X. Q. LI
Keyword(s):  
Accretion Disk ◽  
Vertical Structure ◽  
Stellar Object ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Young Stellar Object ◽  
Magnetic Viscosity ◽  
Anomalous Viscosity ◽  
Outer Disk

AbstractAn accretion disk with vertical structure around a young stellar object is investigated, considering anomalous magnetic viscosity. It was found that the I-mode was unstable in the outer disk, and sometimes turned stable in the inner disk, for the standard α model. However, we find that the I-mode is always unstable in the inner disk, owing to the anomalous magnetic viscosity.

scholarly journals Mass Accretion Processes in Young Stellar Objects: Role of Intense Flaring Activity

2014 ◽  
Vol 1 (1) ◽  
pp. 108-112
Author(s):  
Salvatore Orlando ◽  
Fabio Reale ◽  
Giovanni Peres ◽  
Andrea Mignone
Keyword(s):  
Circumstellar Disks ◽  
Young Stellar Objects ◽  
Disk System ◽  
Low Mass Stars ◽  
Stellar Objects ◽  
Low Mass ◽  
The Stability ◽  
Circumstellar Environment ◽  
Magnetospheric Accretion

According to the magnetospheric accretion scenario, young low-mass stars are surrounded by circumstellar disks which they interact with through accretion of mass. The accretion builds up the star to its nal mass and is also believed to power the mass out ows, which may in turn have a signicant role in removing the excess angular momentum from the star-disk system. Although the process of mass accretion is a critical aspect of star formation, some of its mechanisms are still to be fully understood. On the other hand, strong  aring activity is a common feature of young stellar objects (YSOs). In the Sun, such events give rise to perturbations of the interplanetary medium. Similar but more energetic phenomena occur in YSOs and may in uence the circumstellar environment. In fact, a recent study has shown that an intense flaring activity close to the disk may strongly perturb the stability of circumstellar disks, thus inducing mass accretion episodes (Orlando et al. 2011). Here we review the main results obtained in the eld and the future perspectives.

scholarly journals Mid-infrared interferometry of the massive young stellar object NGC 3603 – IRS 9A

2010 ◽  
Vol 520 ◽  
pp. A78 ◽  
Author(s):  
S. Vehoff ◽  
C. A. Hummel ◽  
J. D. Monnier ◽  
P. Tuthill ◽  
D. E. A. Nürnberger ◽  
...  
Keyword(s):  
Stellar Object ◽  
Mid Infrared ◽  
Young Stellar Object ◽  
Infrared Interferometry

scholarly journals Mid-infrared interferometry towards the massive young stellar object CRL 2136: inside the dust rim

2010 ◽  
Vol 526 ◽  
pp. L5 ◽  
Author(s):  
W. J. de Wit ◽  
M. G. Hoare ◽  
R. D. Oudmaijer ◽  
D. E. A. Nürnberger ◽  
H. E. Wheelwright ◽  
...  
Keyword(s):  
Stellar Object ◽  
Mid Infrared ◽  
Young Stellar Object ◽  
Infrared Interferometry

scholarly journals New Sample of Young Stellar Objects

1991 ◽  
Vol 147 ◽  
pp. 466-475
Author(s):  
S. M. Moy ◽  
G. H. MacDonald ◽  
R. J. Habing
Keyword(s):  
Molecular Cloud ◽  
Stellar Object ◽  
Young Stellar Objects ◽  
Stellar Objects ◽  
Young Stellar Object ◽  
Large Samples ◽  
Protostellar Objects ◽  
Cloud Cores ◽  
Infrared Sources ◽  
Cloud Core

in recent years there has been much interest in the study of large samples of molecular cloud cores and related infrared sources in an attempt to observe true protostars - objects in transition between a molecular cloud core and a young stellar object (YSO). We present here a survey of 48 possible protostellar objects chosen initially by their IRAS colours and subsequently observed in (1—0) HCO+ emission at Onsala in Feb 1990. Future observations in (3—2)13CO & (3—2)12CO will be made with the JCMT and in (1,1) and (2,2) NH3 emission with the Bonn 100m telescope.

scholarly journals Mid-infrared interferometry of massive young stellar objects

2009 ◽  
Vol 505 (2) ◽  
pp. 655-661 ◽  
Author(s):  
H. Linz ◽  
Th. Henning ◽  
M. Feldt ◽  
I. Pascucci ◽  
R. van Boekel ◽  
...  
Keyword(s):  
Young Stellar Objects ◽  
Stellar Objects ◽  
Mid Infrared ◽  
Infrared Interferometry
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