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A Study of the Magnetic Activity and Variability of GJ 436
M. Kumar, R. Fares
We present a magnetic activity study of GJ 436 using spectroscopic data from HARPS, spanning over 14 years, and additional data from NARVAL, falling within the HARPS observations.…
Analysis of physical processes in eruptive YSOs with near infrared spectra and multi-wavelength light curves
Zhen Guo, P. W. Lucas, C. Contreras Peña +11
The decade-long Vista Variables in the Via Lactea (VVV) survey has detected numerous highly variable young stellar objects (YSOs). We present a study of 61 highly variable VVV YSOs…
Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16
L. T. Maud, R. Cesaroni, M. S. N. Kumar +20
We present the highest angular resolution (20x15mas - 44x33au) Atacama Large Millimeter/sub-millimeter Array (ALMA) observations currently possible of the proto-O-star G17.64+0.16…
Chasing discs around O-type (proto)stars - ALMA evidence for an SiO disc and disc wind from G17.64+0.16
L. T. Maud, R. Cesaroni, M. S. N. Kumar +28
We present high angular resolution 0.2 arcsec continuum and molecular emission line Atacama Large Millimeter/sub-millimeter Array (ALMA) observations of G17.64+0.16 in Band 6 (220G…
Accelerating infall and rotational spin-up in the hot molecular core G31.41+0.31
M. T. Beltrán, R. Cesaroni, V. M. Rivilla +20
As part of our effort to search for circumstellar disks around high-mass stellar objects, we observed the well-known core G31.41+0.31 with ALMA at 1.4 mm with an angular resolution…
Highly variable young massive stars in ATLASGAL clumps
M. S. N. Kumar, C. Contreras-Pena, P. W. Lucas +1
High-amplitude variability in Young Stellar Objects (YSOs) is usually associated with episodic accretion events. It has not been observed so far in massive YSOs. Here, the high-amp…
Binary system and jet precession and expansion in G35.20-0.74N
M. T. Beltrán, R. Cesaroni, L. Moscadelli +3
Context. ALMA observations of the high-mass star-forming region G35.20-0.74N have revealed the presence of a Keplerian disk in core B rotating about a massive object of 18 Msun, as…
The ionizing sources of luminous compact HII regions in the RCW106 and RCW122 clouds
J. M. C. Grave, M. S. N. Kumar, D. K. Ojha +2
Given the rarity of young O star candidates, compact HII regions embedded in dense molecular cores continue to serve as potential sites to peer into the details of high-mass star f…
Massive open star clusters using the VVV survey II. Discovery of six clusters with Wolf-Rayet stars
A. -N. Chené, J. Borissova, C. Bonatto +20
Context: The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge,…
Massive open star clusters using the VVV survey I. Presentation of the data and description of the approach
A. -N. Chené, J. Borissova, J. R. A. Clarke +15
Context: The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge,…
Molecular hydrogen jets and outflows in the Serpens south filamentary cloud
G. D. C. Teixeira, M. S. N. Kumar, R. Bachiller +1
We aimed to map the jets and outflows from the Serpens South star forming region and find an empirical relationship between the magnetic field and outflow orientation. Near-infrare…
H2 flows in the Corona Australis cloud and their driving sources
M. S. N. Kumar, Saurabh Sharma, C. J . Davis +2
We uncover the H2 flows in the Corona Australis molecular cloud and in particular identify the flows from the Coronet cluster. Near-infrared H2 v=1--0 S(1), 2.12micron-line, narrow…
Spitzer-IRAC GLIMPSE of high mass protostellar objects II - SED modelling of a bonafide sample
J. M. C. Grave, M. S. N. Kumar
We aim to estimate and analyse the physical properties of the infrared counterparts of HMPOs by comparing their spectral energy distributions (SED) with those predicted by radiativ…