The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations

A. P. Milone; A. F. Marino; A. Renzini; F. D'Antona; J. Anderson; B. Barbuy; L. R. Bedin; A. Bellini; T. M. Brown; S. Cassisi; G. Cordoni; E. P. Lagioia; D. Nardiello; S. Ortolani; G. Piotto; A. Sarajedini; M. Tailo; R. P. van der Marel; E. Vesperini

doi:10.1093/MNRAS/STY2573

The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations

A. P. Milone^*, A. F. Marino, A. Renzini, F. D'Antona, J. Anderson, B. Barbuy, L. R. Bedin, A. Bellini, T. M. Brown, S. Cassisi, G. Cordoni, E. P. Lagioia, D. Nardiello, S. Ortolani, G. Piotto, A. Sarajedini, M. Tailo, R. P. van der Marel, E. Vesperini

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

152 Citations (Scopus)

Abstract

Recent work, based on data from the Hubble Space Telescope (HST) UV Legacy Survey of Galactic Globular Clusters (GCs), has revealed that all the analysed clusters host two groups of first- (1G) and second-generation (2G) stars. In most GCs, both 1G and 2G stars host substellar populations with different chemical composition. We compare multiwavelength HST photometry with synthetic spectra to determine for the first time the average helium difference between the 2G and 1G stars in a large sample of 57 GCs and the maximum helium variation within each of them. We find that in all clusters 2G stars are consistent with being enhanced in helium with respect to 1G. The maximum helium variation ranges from less than 0.01 to more than 0.10 in heliummass fraction and correlateswith both the clustermass and the colour extension of the horizontal branch (HB). These findings demonstrate that the internal helium variation is one of the main (second) parameters governing the HB morphology.

Original language	English
Pages (from-to)	5098-5122
Number of pages	25
Journal	Monthly Notices of the Royal Astronomical Society
Volume	481
Issue number	4
DOIs	https://doi.org/10.1093/MNRAS/STY2573
Publication status	Published - 1 Dec 2018

Access to Document

10.1093/MNRAS/STY2573

Cite this

Milone, A. P., Marino, A. F., Renzini, A., D'Antona, F., Anderson, J., Barbuy, B., Bedin, L. R., Bellini, A., Brown, T. M., Cassisi, S., Cordoni, G., Lagioia, E. P., Nardiello, D., Ortolani, S., Piotto, G., Sarajedini, A., Tailo, M., van der Marel, R. P., & Vesperini, E. (2018). The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations. Monthly Notices of the Royal Astronomical Society, 481(4), 5098-5122. https://doi.org/10.1093/MNRAS/STY2573

@article{125b9bd666ee4e15935cc349a2bd33ee,

title = "The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations",

abstract = "Recent work, based on data from the Hubble Space Telescope (HST) UV Legacy Survey of Galactic Globular Clusters (GCs), has revealed that all the analysed clusters host two groups of first- (1G) and second-generation (2G) stars. In most GCs, both 1G and 2G stars host substellar populations with different chemical composition. We compare multiwavelength HST photometry with synthetic spectra to determine for the first time the average helium difference between the 2G and 1G stars in a large sample of 57 GCs and the maximum helium variation within each of them. We find that in all clusters 2G stars are consistent with being enhanced in helium with respect to 1G. The maximum helium variation ranges from less than 0.01 to more than 0.10 in heliummass fraction and correlateswith both the clustermass and the colour extension of the horizontal branch (HB). These findings demonstrate that the internal helium variation is one of the main (second) parameters governing the HB morphology.",

keywords = "Globular clusters: general, Stars: abundances, Stars: population II",

author = "Milone, {A. P.} and Marino, {A. F.} and A. Renzini and F. D'Antona and J. Anderson and B. Barbuy and Bedin, {L. R.} and A. Bellini and Brown, {T. M.} and S. Cassisi and G. Cordoni and Lagioia, {E. P.} and D. Nardiello and S. Ortolani and G. Piotto and A. Sarajedini and M. Tailo and {van der Marel}, {R. P.} and E. Vesperini",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s).",

year = "2018",

month = dec,

day = "1",

doi = "10.1093/MNRAS/STY2573",

language = "English",

volume = "481",

pages = "5098--5122",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

Milone, AP, Marino, AF, Renzini, A, D'Antona, F, Anderson, J, Barbuy, B, Bedin, LR, Bellini, A, Brown, TM, Cassisi, S, Cordoni, G, Lagioia, EP, Nardiello, D, Ortolani, S, Piotto, G, Sarajedini, A, Tailo, M, van der Marel, RP & Vesperini, E 2018, 'The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations', Monthly Notices of the Royal Astronomical Society, vol. 481, no. 4, pp. 5098-5122. https://doi.org/10.1093/MNRAS/STY2573

TY - JOUR

T1 - The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations

AU - Milone, A. P.

AU - Marino, A. F.

AU - Renzini, A.

AU - D'Antona, F.

AU - Anderson, J.

AU - Barbuy, B.

AU - Bedin, L. R.

AU - Bellini, A.

AU - Brown, T. M.

AU - Cassisi, S.

AU - Cordoni, G.

AU - Lagioia, E. P.

AU - Nardiello, D.

AU - Ortolani, S.

AU - Piotto, G.

AU - Sarajedini, A.

AU - Tailo, M.

AU - van der Marel, R. P.

AU - Vesperini, E.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - Recent work, based on data from the Hubble Space Telescope (HST) UV Legacy Survey of Galactic Globular Clusters (GCs), has revealed that all the analysed clusters host two groups of first- (1G) and second-generation (2G) stars. In most GCs, both 1G and 2G stars host substellar populations with different chemical composition. We compare multiwavelength HST photometry with synthetic spectra to determine for the first time the average helium difference between the 2G and 1G stars in a large sample of 57 GCs and the maximum helium variation within each of them. We find that in all clusters 2G stars are consistent with being enhanced in helium with respect to 1G. The maximum helium variation ranges from less than 0.01 to more than 0.10 in heliummass fraction and correlateswith both the clustermass and the colour extension of the horizontal branch (HB). These findings demonstrate that the internal helium variation is one of the main (second) parameters governing the HB morphology.

AB - Recent work, based on data from the Hubble Space Telescope (HST) UV Legacy Survey of Galactic Globular Clusters (GCs), has revealed that all the analysed clusters host two groups of first- (1G) and second-generation (2G) stars. In most GCs, both 1G and 2G stars host substellar populations with different chemical composition. We compare multiwavelength HST photometry with synthetic spectra to determine for the first time the average helium difference between the 2G and 1G stars in a large sample of 57 GCs and the maximum helium variation within each of them. We find that in all clusters 2G stars are consistent with being enhanced in helium with respect to 1G. The maximum helium variation ranges from less than 0.01 to more than 0.10 in heliummass fraction and correlateswith both the clustermass and the colour extension of the horizontal branch (HB). These findings demonstrate that the internal helium variation is one of the main (second) parameters governing the HB morphology.

KW - Globular clusters: general

KW - Stars: abundances

KW - Stars: population II

UR - http://www.scopus.com/inward/record.url?scp=85059897929&partnerID=8YFLogxK

U2 - 10.1093/MNRAS/STY2573

DO - 10.1093/MNRAS/STY2573

M3 - Article

SN - 0035-8711

VL - 481

SP - 5098

EP - 5122

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations

Abstract

Access to Document

Other files and links

Fingerprint

Cite this