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Multiwavelength detection of an ongoing FUOr-type outburst on a low-mass YSO
(2024-03-01)
During the pre-main-sequence evolution, Young Stellar Objects (YSOs) assemble most of their mass during the episodic accretion process. The rarely seen FUOr-type events are valuable laboratories to investigate the outbursting ...
Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey
(2024-02-01)
During the pre-main-sequence (pre-MS) evolution stage of a star, significant amounts of stellar mass are accreted during episodic accretion events, such as multidecade FUor-type outbursts. Here, we present a near-infrared ...
The most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others
(2024-02-01)
We have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) data base of 9.5 yr light curves for variable sources with ΔKs ≥ 4 mag, aiming to provide a large sample of high amplitude eruptive young ...
The VVV Open Cluster Project II. Near-infrared sequences of 37 open clusters on eight-dimensional parameter space
(2022-07-01)
Open clusters are key coeval structures that help us understand star formation, stellar evolution and trace the physical properties of our Galaxy. In the past years, the isolation of open clusters from the field has been ...
Discovery of new globular clusters in the Sagittarius dwarf galaxy
(2021-03-12)
Context. Globular clusters (GCs) are witnesses of the past accretion events onto the Milky Way. In particular, the GCs of the Sagittarius (Sgr) dwarf galaxy are important probes of an on-going merger. Aims. Our main goal ...
Short and long term near-infrared spectroscopic variability of eruptive protostars from VVV
(2020-02-01)
Numerous eruptive variable young stellar objects (YSOs), mostly Class I systems, were recently detected by the near-infrared Vista Variables in the Via Lactea (VVV) survey. We present an exploratory near-infrared spectroscopic ...
Mapping the stellar age of the Milky Way bulge with the VVV : II. Deep JK s catalog release based on PSF photometry
(2019-09-01)
Context. The bulge represents the best compromise between old and massive Galactic components, and as such its study is a valuable opportunity to understand how the bulk of the Milky Way formed and evolved. In addition, ...
A colour-excess extinction map of the southern Galactic disc from the VVV and GLIMPSE surveys
(2019-09-01)
An improved high-resolution and deep A Ks foreground dust extinction map is presented for the Galactic disc area within 295◦ ≾ l ≾ 350◦, −1.0◦ ≾ b ≾ +1.0◦. At some longitudes the map reaches up to |b| ~ 2.25◦, for a total ...
New Galactic star clusters discovered in the disc area of the VVVX survey
(2018-12-11)
The "VISTA Variables in the Via Lactea eXtended (VVVX)" ESO Public Survey is a near-infrared photometric sky survey that covers nearly 1700 sq. deg towards the Galactic disk and bulge. It is well-suited to search for new ...
VIRAC: The VVV Infrared Astrometric Catalogue
(2018-02-21)
We present VIRAC version 1, a near-infrared proper motion and parallax catalogue of the VISTA Variables in the Via Lactea (VVV) survey for 312 587 642 unique sources averaged across all overlapping pawprint and tile images ...