The infrared eye of the wide-field camera 3 on the Hubble Space Telescope reveals multiple main sequences of very low mass stars in NGC2808
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Milone, Antonino; Marino, Anna; Cassisi, S; Piotto, G; Bedin, L R; Anderson, Jay; Aparicio, A; Bellini, A; Buonanno, R; Pietrinferni, A
Description
We use images taken with the infrared channel of the Wide Field Camera 3 on the Hubble Space Telescope to study the multiple main sequences (MSs) of NGC2808. Below the turnoff, the red, the middle, and the blue MS, previously detected from visual-band photometry, are visible over an interval of about 3.5 F160W magnitudes. The three MSs merge together at the level of the MS bend. At fainter magnitudes, the MS again splits into two components containing ∼65% and ∼35% of stars, with the...[Show more]
dc.contributor.author | Milone, Antonino | |
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dc.contributor.author | Marino, Anna | |
dc.contributor.author | Cassisi, S | |
dc.contributor.author | Piotto, G | |
dc.contributor.author | Bedin, L R | |
dc.contributor.author | Anderson, Jay | |
dc.contributor.author | Aparicio, A | |
dc.contributor.author | Bellini, A | |
dc.contributor.author | Buonanno, R | |
dc.contributor.author | Pietrinferni, A | |
dc.date.accessioned | 2015-12-13T22:40:22Z | |
dc.identifier.issn | 2041-8205 | |
dc.identifier.uri | http://hdl.handle.net/1885/78213 | |
dc.description.abstract | We use images taken with the infrared channel of the Wide Field Camera 3 on the Hubble Space Telescope to study the multiple main sequences (MSs) of NGC2808. Below the turnoff, the red, the middle, and the blue MS, previously detected from visual-band photometry, are visible over an interval of about 3.5 F160W magnitudes. The three MSs merge together at the level of the MS bend. At fainter magnitudes, the MS again splits into two components containing ∼65% and ∼35% of stars, with the most-populated MS being the bluest one. Theoretical isochrones suggest that the latter is connected to the red MS discovered in the optical color-magnitude diagram (CMD) and hence corresponds to the first stellar generation, having primordial helium and enhanced carbon and oxygen abundances. The less-populated MS in the faint part of the near-IR CMD is helium-rich and poor in carbon and oxygen, and it can be associated with the middle and the blue MS of the optical CMD. The finding that the photometric signature of abundance anti-correlation is also present in fully convective MS stars reinforces the inference that they have a primordial origin. | |
dc.publisher | Institute of Physics Publishing Ltd. | |
dc.rights | Author/s retain copyright | |
dc.source | Astrophysical Journal Letters | |
dc.subject | Keywords: globular clusters: individual (NGC 2808); Hertzsprung-Russell and C-M diagrams | |
dc.title | The infrared eye of the wide-field camera 3 on the Hubble Space Telescope reveals multiple main sequences of very low mass stars in NGC2808 | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 754 | |
dc.date.issued | 2012 | |
local.identifier.absfor | 020100 - ASTRONOMICAL AND SPACE SCIENCES | |
local.identifier.ariespublication | f5625xPUB6891 | |
local.type.status | Published Version | |
local.contributor.affiliation | Milone, Antonino, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Marino, Anna, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Cassisi, S, INAF-Observatorio Astronomico di Collurania | |
local.contributor.affiliation | Piotto, G, Università di Padova | |
local.contributor.affiliation | Bedin, L R, INAF-Osservatorio Astronomico di Padova | |
local.contributor.affiliation | Anderson, Jay, Space Telescope Science Institute | |
local.contributor.affiliation | Aparicio, A, University of La Laguna | |
local.contributor.affiliation | Bellini, A, Space Telescope Science Institute | |
local.contributor.affiliation | Buonanno, R, INAF – Osservatorio Astronomico di Collurania | |
local.contributor.affiliation | Pietrinferni, A, INAF - Osservatorio Astronomico di Teramo | |
local.bibliographicCitation.issue | 2 | |
local.identifier.doi | 10.1088/2041-8205/754/2/L34 | |
dc.date.updated | 2016-02-24T09:31:41Z | |
local.identifier.scopusID | 2-s2.0-84864264073 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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