A deep view of a fossil relic in the Galactic bulge: The Globular Cluster HP 1

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dc.contributor.authorKerber L.O.
dc.contributor.authorLibralato M.
dc.contributor.authorSouza S.O.
dc.contributor.authorOliveira R.A.P.
dc.contributor.authorOrtolani S.
dc.contributor.authorPérez-Villegas A.
dc.date.accessioned2024-07-01T20:40:08Z
dc.date.available2024-07-01T20:40:08Z
dc.date.issued2019-04-21
dc.descriptionIndexación: Scopus.
dc.description.abstractHP 1 is an α-enhanced and moderately metal-poor bulge globular cluster with a blue horizontal branch. These combined characteristics make it a probable relic of the early star formation in the innermost Galactic regions. Here, we present a detailed analysis of a deep near-infrared (NIR) photometry of HP 1 obtained with the NIR GSAOI + GeMS camera at the Gemini-South telescope. J and K S images were collected with an exquisite spatial resolution (FWHM 1/40.1 arcsec), reaching stars at two magnitudes below the MSTO. We combine our GSAOI data with archival F606W-filter HST ACS/WFC images to compute relative proper motions and select bona fide cluster members. Results from statistical isochrone fits in the NIR and optical-NIR colour-magnitude diagrams indicate an age of 12.8 +0.9-0.8 Gyr, confirming that HP 1 is one of the oldest clusters in the Milky Way. The same fits also provide apparent distance moduli in the K S and V filters in very good agreement with the ones from 11 RR Lyrae stars. By subtracting the extinction in each filter, we recover a heliocentric distance of 6.59 +0.17-0.15 kpc. Furthermore, we refine the orbit of HP 1 using this accurate distance and update and accurate radial velocities (from high-resolution spectroscopy) and absolute proper motions (from Gaia DR2), reaching mean perigalactic and apogalactic distances of 1/40.12 and 1/43 kpc, respectively.
dc.description.urihttps://watermark.silverchair.com/stz003.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAA1AwggNMBgkqhkiG9w0BBwagggM9MIIDOQIBADCCAzIGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQM7mXQI3vkpDxbl9qAAgEQgIIDA-DObGhMpu4v25ZYkxSN3BRJHytoAlUSYpEuzsZRJrx8d1HN5JB6xVrYCKdBGTVFjQn6_DQfbBa8xDyjN0s5SejlnLceZNH7VjLLYSUYu3UgnPR4IZmnuF6gEkHXkzBESdGxKyM8FMAwOHn6h3apDUVWAAIXtCW7ztZNVIWKHJHNcxu18OdRXruTNSWB_RMfo5YcDJUy0TYHIvsq_aARIS7wyG4_mUtpzw0gvjRwtcaUsvsY08Qof9NuLIgcvdaIU0amKVE8iFxngyLbZb2jXaurWCAYwibtUMwqIyz5E2qhPpDnMYrxKiLully1qEqdWvf1jZl-8n4iAOzZcYej5rv42wIApqxAnBuVtaQvYf6VFRJkBo153zd1pjaoIyhuUwF8nIzQwRn5BRcwh_vpIoBz1HD0M-CIagmTGW9HQYkamTb_PL7OnfxYIYc6XpbB_rHDIZXAwnLd3hEtGXQOEmxWa6EcTnSujKhqbdnCgo7_nuQVeM8fYz5Mrt7cS3AzilJrypkGS3fjZ7qn-QNf7r7KmSe2PLyhLDr6qSjIaLu_q-OfUVKl8UJNHrBbWlk2z87CP0XNXujQ5LG8Qud75uO6dnNiE83Je6RX0WLf3H5-wb9MD0sqkV571fmHKGKM4WMP9PGNQaaynFO-NdiS0TKXZfyTrycD45eBC4WYOUk74D9UyayKE_O8d0HRlitBvHVhwvHPgvxipGedjAOMqbltYquoy0pXUadAYW7hRf242Dw0h_NLGtknUNfKwNSJKCtlt8PUolW3iAntONvVoPDl2YxzXRoDns_4u4M9ts2mt9_PCbttOyrRP451G7FW-ZWIdIcmPdjwH5BJn1lsRNDWOAP-GDoQ_6IV9DsMSM3W0rBphG7M7LAaMt-63s6K4BaXIuXlkZoGwwB4nxHBUD1jjbfEJNDOdCdxYbfLDTBNjuolXN2RIu4d2EBT7hU2CAjSkjfo7gkvCcGQNZTfXfDj8ThrTvBPpVOKeePri6cuvxK8ODJGaSNe3vDnltYRBj_bPQ
dc.identifier.citationMonthly Notices of the Royal Astronomical Society Volume 484, Issue 4, Pages 5530 - 5550 21 April 2019
dc.identifier.doi10.1093/mnras/stz003
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/58092
dc.language.isoen_US
dc.publisherOxford University Press
dc.subjectGalaxy: bulge
dc.subjectglobular clusters: individual: HP 1
dc.subjectinfrared: stars
dc.subjectinstrumentation: adaptive optics
dc.titleA deep view of a fossil relic in the Galactic bulge: The Globular Cluster HP 1
dc.typeArtículo
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