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We present a spectroscopic follow-up of photometrically-selected young stellar object (YSO) candidates in the Central Molecular Zone of the Galactic center. Our goal is to quantify the contamination of this YSO sample by reddened giant…

Stars form in clustered environments, but how they form when the available resources are shared is still not well understood. A related question is whether the IMF is in fact universal across galactic environments, a galactic initial mass…

Solar and Stellar Astrophysics · Physics 2018-09-05 Juan R. Martínez-Galarza , Pavlos Protopapas , Howard A. Smith , Esteban F. E. Morales

M71 is a nearby, metal-rich globular cluster at low Galactic latitude, where field contamination and spatially variable extinction complicate colour-magnitude diagrams (CMDs) and the identification of cluster member variable stars. Our aims…

Astrophysics of Galaxies · Physics 2026-05-13 C. C. Cortés , D. Deras , A. Arellano Ferro , S. Muneer , I. H. Bustos Fierro

We present 737 candidate Young Stellar Objects (YSOs) near the W51 Giant Molecular Cloud (GMC) over an area of 1.25 deg x 1.00 deg selected from Spitzer Space Telescope data. We use spectral energy distribution (SED) fits to identify YSOs…

Astrophysics of Galaxies · Physics 2014-11-20 Miju Kang , John H. Bieging , Matthew S. Povich , Youngung Lee

The Galaxy appears to be richer in young, massive stellar clusters than previously known, due to advances in infrared surveys which have uncovered deeply embedded regions of star formation. Young, massive clusters can significantly impact…

Astrophysics of Galaxies · Physics 2015-06-11 Emily E. Richards , Cornelia C. Lang , Christine Trombley , Donald F. Figer

The frequency of multiple systems and their properties are key constraints of stellar formation and evolution. Formation mechanisms of very low-mass (VLM) objects are still under considerable debate and an accurate assessment of their…

Solar and Stellar Astrophysics · Physics 2017-02-01 M. C. Galvez-Ortiz , E. Solano , N. Lodieu , M. Aberasturi

We present a comprehensive catalog of 700 confirmed star clusters in the field of M31 compiled from three major existing catalogs. We detect 418 and 257 star clusters in Galaxy Evolution Explorer (GALEX) near-ultraviolet (NUV) and…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Yongbeom Kang , Soo-Chang Rey , Luciana Bianchi , Kyungsook Lee , YoungKwang Kim , Sangmo Tony Sohn

The aim of this study is to locate previously unknown stellar clusters from the VISTA variables in the V\'ia L\'actea Survey (VVV) catalogue data. The method, fitting a mixture model of Gaussian densities and background noise using the…

Astrophysics of Galaxies · Physics 2015-06-18 Otto Solin , Lauri Haikala , Esko Ukkonen

Context: Photometric variability is a defining characteristic of young stellar objects (YSO), which can be traced back to a range of physical processes taking place at different stages of young stars' formation and early evolution. Gaia's…

Solar and Stellar Astrophysics · Physics 2026-01-21 Chloé Mas , Julia Roquette , Marc Audard , Mate Madarász , Gabor Marton , David Hernandez , Ilknur Gezer , Odysseas Dionatos

As deep spectroscopic campaigns extend to higher redshifts and lower stellar masses, the interpretation of galaxy spectra depends increasingly upon models for very young stellar populations. Here we present new HST/COS ultraviolet…

Astrophysics of Galaxies · Physics 2021-04-07 Peter Senchyna , Daniel P. Stark , Stéphane Charlot , Jacopo Chevallard , Gustavo Bruzual , Alba Vidal-García

Measuring properties of young stellar objects (YSOs) is necessary for probing the pre-main-sequence evolution of stars. As YSOs exhibit complex geometry, measurement generally entails comparing observed radiation to template populations of…

Solar and Stellar Astrophysics · Physics 2025-07-24 Theo Richardson , Adam Ginsburg , Erik Rosolowsky , Joshua Peltonen , Rémy Indebetouw

Multi-wavelength analysis of the young massive cluster VVV CL077 is presented for the first time. Our Chandra survey of this region enabled the detection of three X-ray emitting stellar members of the cluster, as well as a possible diffuse…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Arash Bodaghee , John A. Tomsick , Francesca Fornasini , Farid Rahoui , Franz E. Bauer

We present a statistical and multiwavelength photometric studies of young open cluster IC 1590. We identified 91 cluster members using $Gaia$ DR3 astrometry data using ensemble-based unsupervised machine learning techniques. From $Gaia$…

Astrophysics of Galaxies · Physics 2024-02-26 A. H. Sheikh , Biman J. Medhi

Using infrared photometric data extracted from the 2MASS, IRAS and MSX databases, 142 suspected young stellar objects (YSOs) are selected from about 2 million stars in the Camelopardalis segment of the Milky Way limited by Galactic…

Astrophysics · Physics 2009-06-25 V. Straizys , V. Laugalys

Young stellar associations hold a star formation record that can persist for millions of years, revealing the progression of star formation long after the dispersal of the natal cloud. To identify nearby young stellar populations that trace…

Astrophysics of Galaxies · Physics 2021-08-18 Ronan Kerr , Aaron C. Rizzuto , Adam L. Kraus , Stella S. R. Offner

The results of the searching on the bases of GPS UKIDSS survey's data of dense compact stellar clusters in the vicinity of 20 YSOs with high and middle masses are presented. Totally we have revealed clusters in 13 areas. Around 5 objects…

Solar and Stellar Astrophysics · Physics 2015-12-29 N. M. Azatyan , E. H. Nikoghosyan

Context. The Gaia third Data Release (DR3) presents the first catalogue of full-sky variable Young Stellar Object (YSO) candidates observed by the Gaia space telescope during the initial 34 months of science operations. Aims. Numerous types…

Young massive clusters (YMCs) are the most compact, high-mass stellar systems still forming at the present day. The precursor clouds to such systems are, however, rare due to their large initial gas mass reservoirs and rapid dispersal…

Studies in the past few decades have investigated young stellar object evolution based on their spectral energy distribution (SED). The SED is heavily influenced not only by evolutionary stage, but also the morphology of the young star.…

Solar and Stellar Astrophysics · Physics 2026-03-04 David Hernandez , Odysseas Dionatos , Marc Audard , Gábor Marton , Julia Roquette , Ilknur Gezer , Máté Madarász , Kai L. Polsterer

Understanding the characteristics of young stellar populations is essential for deriving insights into star formation processes within parent molecular clouds and the influence of massive stars. This study focuses on YSOs in the G…

Astrophysics of Galaxies · Physics 2024-06-10 N. Azatyan , E. Nikoghosyan , A. Samsonyan , D. Elia , L. Kaper , A. Yeghikyan , D. Andreasyan , D. Baghdasaryan