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A set of six debris disk candidates identified with IRAS or WISE excesses were observed at either 350 um or 450 um with the CSO. Five of the targets - HIP 51658, HIP 68160, HIP 73512, HIP 76375, and HIP 112460 - have among the largest…

Solar and Stellar Astrophysics · Physics 2015-06-16 J. Bulger , T. Hufford , A. Schneider , J. Patience , I. Song , R. J. De Rosa , A. Rajan , C. D. Dowell , D. McCarthy , C. Kulesa

ALMA continuum measurements of the local ULIRG IRAS 07251-0248 E at 667$\mu$m reveal an extremely compact (R < 27 pc) and bright ($T_B$ >200 K) nucleus with an absorbing foreground envelope and a surrounding (R ~ 75 pc) disk or torus seen…

Protostellar jets are present in the later stages of the stellar formation. Non-thermal radio emission has been detected from the jets and hot spots of some massive protostars, indicating the presence of relativistic electrons there. We are…

High Energy Astrophysical Phenomena · Physics 2015-06-11 Anabella T. Araudo , Luis Felipe Rodriguez

We performed a mid-infrared imaging survey of evolved stars in order to study the dust distribution in circumstellar envelopes around these objects and to better understand the mass-loss mechanism responsible for the formation of these…

Solar and Stellar Astrophysics · Physics 2015-05-30 E. Lagadec , A. A. Zijlstra , R. D. Oudmaijer , T. Verhoelst , N. L. J. Cox , R. Szczerba , D. Mekarnia , H. van Winckel

High-quality K-band spectra of point sources, deeply embedded in massive star-forming regions, have revealed a population of 20 young massive stars showing no photospheric absorption lines, but only emission lines. The K-band spectra…

Astrophysics · Physics 2009-11-11 Arjan Bik , Lex Kaper , Wing-Fai Thi , Rens Waters

We present a R=10,000 M-band spectrum of LLN19 (IRAS 08470-4321), a heavily embedded intermediate-mass young stellar object located in the Vela Molecular Cloud, obtained with VLT-ISAAC. The data were fitted by a 2-slab cold-hot model and a…

Astrophysics of Galaxies · Physics 2015-05-18 W. -F. Thi , E. F. van Dishoeck , K. M. Pontoppidan , E. Dartois

To better understand the initial conditions of the high-mass star formation process, it is crucial to study at high-angular resolution the morphology, the kinematics, and eventually the interactions of the coldest condensations associated…

Astrophysics of Galaxies · Physics 2015-05-13 F. Fontani , Q. Zhang , P. Caselli , T. L. Bourke

We report new mid-infrared observations of the remarkable object IRAS 15099-5856 using the space telescopes AKARI and Spitzer, which demonstrate the presence of prominent crystalline silicate emission in this bright source. IRAS 15099-5856…

The low-mass star formation region associated with the reflection nebula Cederblad 110 in the Chamaeleon I cloud was mapped with the Australian Telescope Compact Array (ATCA) at 6 and 3.5cm. Altogether 11 sources were detected, three of…

Astrophysics · Physics 2011-05-23 K. Lehtinen , J. Harju , S. Kontinen , James L. Higdon

We present mid-infrared (MIR) observations, made with the TIMMI2 camera on the ESO 3.6 m telescope, toward 14 young massive star-forming regions. All regions were imaged in the N band, and nine in the Q band, with an angular resolution of ~…

Astrophysics of Galaxies · Physics 2011-02-11 Esteban F. E. Morales , Diego Mardones , Guido Garay , Kate J. Brooks , Jaime E. Pineda

Direct observations of accretion disks around high-mass young stellar objects would help to discriminate between different models of formation of massive stars. However, given the complexity of massive star forming regions, such studies are…

Solar and Stellar Astrophysics · Physics 2015-05-27 S. Leurini , C. Codella , L. Zapata , M. T. Beltran , P. Schilke , R. Cesaroni

The group of 7 thermally emitting and radio-quiet isolated neutron stars (INSs) discovered by ROSAT constitutes a nearby population which locally appears to be as numerous as that of the classical radio pulsars. So far, attempts to enlarge…

Astrophysics · Physics 2008-11-26 Adriana M. Pires , Christian Motch

We present deep James Webb Space Telescope near-infrared imaging to search for a quiescent or transient counterpart to FRB 20250316A, which was precisely localized with the CHIME/FRB Outriggers array to an area of $11\times13$ pc in the…

We present a multiwavelength study of the massive star forming region associated with IRAS 06055+2039 which reveals an interesting scenario of this complex where regions are at different stages of evolution of star formation. Narrow band…

Astrophysics · Physics 2009-11-11 A. Tej , D. K. Ojha , S. K. Ghosh , V. K. Kulkarni , R. P. Verma , S. Vig , T. P. Prabhu

We report the discovery of a mid-infrared outburst in a Young Stellar Object (YSO) with an amplitude close to 8 mag at $\lambda$$\approx$4.6 $\mu$m. WISEA J142238.82-611553.7 is one of 23 highly variable WISE sources discovered in a search…

We present HST/NICMOS observations with 0.1" (15 AU) resolution of six young stellar objects in the Taurus star-formation region. The targets of our survey are three Class I IRAS sources (IRAS 04016+2610, IRAS 04248+2612, and IRAS…

Aims: The inner regions of high-mass protostars are often invisible in the near-infrared. We aim to investigate the inner gaseous disc of IRAS11101-5829 through scattered light from the outflow cavity walls. Methods: We observed the…

Solar and Stellar Astrophysics · Physics 2020-01-22 R. Fedriani , A. Caratti o Garatti , M. Koutoulaki , R. Garcia-Lopez , A. Natta , R. Cesaroni , R. Oudmaijer , D. Coffey , T. Ray , B. Stecklum

Utilizing a decade-long unTimely dataset, supplemented by multi-band data from archives, we search for young stellar objects (YSOs) with variations larger than one magnitude in W1 band within a region of 110 square degrees in the Galactic…

Solar and Stellar Astrophysics · Physics 2024-06-27 Jiaxun Li , Tinggui Wang

We present molecular line observations of the massive star forming region IRAS 17233-3606 aimed at studying the molecular core associated with the source. The observations were made using the Atacama Pathfinder Experiment telescope in the…

Astrophysics · Physics 2009-11-13 S. Leurini , C. Hieret , S. Thorwirth , F. Wyrowski , P. Schilke , K. M. Menten , R. Guesten , L. Zapata

The filament IRDC G035.39--00.33 in the W48 molecular complex is one of the darkest infrared clouds observed by \textit{Spitzer}. It has been observed by the PACS (70 and 160\,$\micron$) and SPIRE (250, 350, and 500\,$\micron$) cameras of…

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