The G 305 Star-forming Region. II. Irregular Variable Stars

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dc.contributor.authorMedina, N.
dc.contributor.authorBorissova, J.
dc.contributor.authorKurtev, R.
dc.contributor.authorAlonso-García, J.
dc.contributor.authorRomán-Zúñiga, Carlos G.
dc.contributor.authorBayo, Amelia
dc.contributor.authorKounkel, Marina
dc.contributor.authorRoman-Lopes, Alexandre
dc.contributor.authorLucas, P. W.
dc.contributor.authorCovey, K. R.
dc.contributor.authorFórster, Francisco
dc.contributor.authorMinniti, Dante
dc.contributor.authorAdame, Lucia
dc.contributor.authorHernández, Jesús
dc.date.accessioned2022-11-30T02:46:33Z
dc.date.available2022-11-30T02:46:33Z
dc.date.issued2021
dc.description.abstractWe present a catalog of 167 newly discovered, irregular variables spanning a ∼7 deg2 area that encompasses the G 305 star-forming complex, one of the most luminous giant H ii regions in the Galaxy. We aim to unveil and characterize the young stellar object (YSO) population of the region by analyzing the Ks-band variability and JHKs infrared colors from the VISTA Variables in the Vía Láctea survey. Additionally, SDSS-IV APOGEE-2 infrared spectra of selected objects are analyzed. The sample shows relatively high amplitudes (0.661 mag < ΔKS < 3.521 mag). Most of them resemble sources with outbursts with amplitude >1 mag and duration longer than a few days, typically at least a year, known as eruptive variables. About 60% are likely to be Class II/flat/I objects. This is also confirmed by the spectral index α when available. From the analysis of APOGEE-2 near-infrared spectra of sources in the region, another 122 stars are classified as YSOs and display some infrared variability. The measured effective temperature Teff peak is around 4000 K, and they are slightly supersolar in metal abundance. The modal radial velocity is approximately −41 km s−1. Combining available catalogs of YSOs in the region with our data, we investigate the spatial distributions of 700 YSOs. They are clearly concentrated within the central cavity formed by the massive clusters Danks 1 and 2. The calculated surface density for the entire catalog is 0.025 YSOs pc−2, while the central cavity contains 10 times more objects per area (0.238 YSOs pc−2).en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameMedina_G3052021.pdf
dc.identifier.doihttps://doi.org/10.3847/1538-4357/abf639
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7418
dc.languageen
dc.publisherAmerican Astronomical Society (Aas)
dc.rights© 2021. The American Astronomical Society. All rights reserved.
dc.sourceThe AstroPhysical Journal
dc.subjectPRE-MAIN SEQUENCE STARSen_ES
dc.subjectINFRARED ASTRONOMYen_ES
dc.subjectIRREGULAR VARIABLE STARSen_ES
dc.subjectOPEN STAR CLUSTERSen_ES
dc.titleThe G 305 Star-forming Region. II. Irregular Variable Stars
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia

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