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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, A.
dc.contributor.authorKounkel, Marina
dc.contributor.authorRoman-Lopes, Alexandre
dc.contributor.authorLucas, P. W.
dc.contributor.authorCovey, K. R.
dc.contributor.authorFörster, Francisco
dc.contributor.authorMinniti, Dante
dc.contributor.authorAdame, Lucia
dc.contributor.authorHernández, Jesús
dc.date.accessioned2021-06-18T16:00:01Z
dc.date.available2021-06-18T16:00:01Z
dc.date.issued2021-06-10
dc.identifier.citationMedina , N , Borissova , J , Kurtev , R , Alonso-García , J , Román-Zúñiga , C G , Bayo , A , Kounkel , M , Roman-Lopes , A , Lucas , P W , Covey , K R , Förster , F , Minniti , D , Adame , L & Hernández , J 2021 , ' The G 305 Star-forming Region. II. Irregular variable stars ' , The Astrophysical Journal , vol. 914 , no. 1 , 28 . https://doi.org/10.3847/1538-4357/abf639
dc.identifier.issn1538-4357
dc.identifier.otherPURE: 25442852
dc.identifier.otherPURE UUID: 3988140b-8f88-460a-b491-f47ab5019ada
dc.identifier.otherArXiv: http://arxiv.org/abs/2104.02200v1
dc.identifier.otherORCID: /0000-0002-8872-4462/work/95730887
dc.identifier.otherScopus: 85108813601
dc.identifier.urihttp://hdl.handle.net/2299/24594
dc.description© 2021. The American Astronomical Society. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.3847/1538-4357/abf639
dc.description.abstractWe present a catalog of 167 newly discovered, irregular variables spanning a $\sim$7 deg${^2}$ 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 $K_{\rm s}$-band variability and $JHK_{\rm s}$ infrared colors from the {\it VISTA Variables in the V\'ia L\'actea} (VVV) survey. Additionally, SDSS-IV APOGEE-2 infrared spectra of selected objects are analyzed. The sample show relatively high amplitudes ($0.6611$ mag and duration longer than a few days, typically at least a year, known as {\it Eruptive Variables}. About 60% are likely to be Class II/Flat/I objects. This is also confirmed by the spectral index $\alpha$ when available. From the analysis of APOGEE-2 near-infrared spectra of sources in the region, another 122 stars are classified as YSOs, and displays some infrared variability. The measured effective temperature $T_{\rm eff}$ peak is around 4000K and they are slightly super-solar in metal abundance. The modal radial velocity is approximately $-$41 km/s. Combining available catalogs of YSOs in the region with our data, we investigate the spatial distributions of 700 YSOs. They are clearly concentrated within the central cavity formed by the massive clusters Danks 1 and 2. The calculated surface density for the entire catalog is 0.025 YSOs/pc$^{-2}$, while the central cavity contains 10 times more objects per area (0.238 YSOs/pc$^{-2}$).en
dc.format.extent17
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectastro-ph.GA
dc.subjectastro-ph.SR
dc.titleThe G 305 Star-forming Region. II. Irregular variable starsen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionCentre for Climate Change Research
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.date.embargoedUntil2022-06-10
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.3847/1538-4357/abf639
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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