A massive open cluster hiding in full sight

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dc.contributor.authorNegueruela, I.
dc.contributor.authorChene, A.-N.
dc.contributor.authorTabernero, H. M.
dc.contributor.authorDorda, R.
dc.contributor.authorBorissova, J.
dc.contributor.authorMarco, A.
dc.contributor.authorKurtev, R.
dc.date.accessioned2022-11-30T02:46:42Z
dc.date.available2022-11-30T02:46:42Z
dc.date.issued2021
dc.description.abstractObscuration and confusion conspire to limit our knowledge of the inner MilkyWay. Even atmoderate distances, the identification of stellar systems becomes compounded by the extremely high density of background sources. Here, we provide a very revealing example of these complications by unveiling a large, massive, young cluster in the Sagittarius arm that has escaped detection until now despite containing more than 30 stars brighter than G = 13. By combining Gaia DR2 astrometry, Gaia and 2MASS photometry, and optical spectroscopy, we find that the new cluster, which we name Valparaiso 1, located at ∼ 2.3 kpc, is about 75 Ma old and includes a large complement of evolved stars, among which we highlight the 4 d classical Cepheid CM Sct and an M-type giant that probably represents the first detection of an asymptotic giant branch star in a Galactic young open cluster. Although strong differential reddening renders accurate parameter determination unfeasible with the current data set, direct comparison to clusters of similar age suggests that Valparaiso 1 was born as one of the most massive clusters in the solar neighbourhood, with an initial mass close to 104M .en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameNegueruela_Mas2021.pdf
dc.identifier.doihttps://doi.org/10.1093/mnras/stab1117
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7465
dc.languageen
dc.publisherRoyal Astronomical Society
dc.rights© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectSTARS: EVOLUTIONen_ES
dc.subjectHERTZSPRUNGen_ES
dc.subjectRUSSELL AND COLOURen_ES
dc.subjectMAGNITUDE DIAGRAMSen_ES
dc.subjectSUPERGIANTSen_ES
dc.subjectSTARS: VARIABLES: CEPHEIDSen_ES
dc.subjectOPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: VALPARAISO 1.en_ES
dc.titleA massive open cluster hiding in full sight
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia
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