Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC 6791

K. Brogaard; T. Arentoft; J. Jessen-Hansen; A. Miglio

doi:10.1093/mnras/stab2183

Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC 6791

K. Brogaard^*, T. Arentoft, J. Jessen-Hansen, A. Miglio

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

16 Citations (Scopus)

Abstract

We perform an asteroseismic investigation of giant stars in the field of NGC 6791 with previous indications of atypical evolution. The analysis uses observations from Kepler and Gaia in combination with ground-based photometry, a literature radial-velocity study, and measurements of eclipsing binaries in the cluster. We derive mass, radius, effective temperature, evolutionary stage, and apparent distance modulus of each target. Among the investigated cluster giants we find clear evidence of overmassive and undermassive members, and non-members with strong hints of potential past membership. Our results indicate that about 10 per cent of the red giants in the cluster have experienced mass transfer or a merger. High-resolution high-S/N spectroscopic follow-up could confirm potential past membership of the non-members, and reveal whether certain element abundances might expose the non-standard evolution of overmassive and undermassive stars. If so, field stars of similar type could be identified as what they are, i.e. overmassive or undermassive stars, and not mistakenly classified as younger or older than they are.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society
Volume	507
Issue	1
Pages (from-to)	496-509
ISSN	0035-8711
DOIs	https://doi.org/10.1093/mnras/stab2183
Publication status	Published - Oct 2021

Keywords

open clusters and associations: individual: NGC 6791
stars: evolution
stars: fundamental parameters
stars: oscillations
stars: peculiar

Access to Document

10.1093/mnras/stab2183

https://arxiv.org/pdf/2108.03869.pdf

Check availability with the Royal Danish Library

Cite this

@article{350aee3e51f5454fb0b6bf930217d9c7,

title = "Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC 6791",

abstract = "We perform an asteroseismic investigation of giant stars in the field of NGC 6791 with previous indications of atypical evolution. The analysis uses observations from Kepler and Gaia in combination with ground-based photometry, a literature radial-velocity study, and measurements of eclipsing binaries in the cluster. We derive mass, radius, effective temperature, evolutionary stage, and apparent distance modulus of each target. Among the investigated cluster giants we find clear evidence of overmassive and undermassive members, and non-members with strong hints of potential past membership. Our results indicate that about 10 per cent of the red giants in the cluster have experienced mass transfer or a merger. High-resolution high-S/N spectroscopic follow-up could confirm potential past membership of the non-members, and reveal whether certain element abundances might expose the non-standard evolution of overmassive and undermassive stars. If so, field stars of similar type could be identified as what they are, i.e. overmassive or undermassive stars, and not mistakenly classified as younger or older than they are.",

keywords = "open clusters and associations: individual: NGC 6791, stars: evolution, stars: fundamental parameters, stars: oscillations, stars: peculiar",

author = "K. Brogaard and T. Arentoft and J. Jessen-Hansen and A. Miglio",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2021",

month = oct,

doi = "10.1093/mnras/stab2183",

language = "English",

volume = "507",

pages = "496--509",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC 6791. / Brogaard, K.; Arentoft, T.; Jessen-Hansen, J. et al.
In: Monthly Notices of the Royal Astronomical Society, Vol. 507, No. 1, 10.2021, p. 496-509.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC 6791

AU - Brogaard, K.

AU - Arentoft, T.

AU - Jessen-Hansen, J.

AU - Miglio, A.

PY - 2021/10

Y1 - 2021/10

N2 - We perform an asteroseismic investigation of giant stars in the field of NGC 6791 with previous indications of atypical evolution. The analysis uses observations from Kepler and Gaia in combination with ground-based photometry, a literature radial-velocity study, and measurements of eclipsing binaries in the cluster. We derive mass, radius, effective temperature, evolutionary stage, and apparent distance modulus of each target. Among the investigated cluster giants we find clear evidence of overmassive and undermassive members, and non-members with strong hints of potential past membership. Our results indicate that about 10 per cent of the red giants in the cluster have experienced mass transfer or a merger. High-resolution high-S/N spectroscopic follow-up could confirm potential past membership of the non-members, and reveal whether certain element abundances might expose the non-standard evolution of overmassive and undermassive stars. If so, field stars of similar type could be identified as what they are, i.e. overmassive or undermassive stars, and not mistakenly classified as younger or older than they are.

AB - We perform an asteroseismic investigation of giant stars in the field of NGC 6791 with previous indications of atypical evolution. The analysis uses observations from Kepler and Gaia in combination with ground-based photometry, a literature radial-velocity study, and measurements of eclipsing binaries in the cluster. We derive mass, radius, effective temperature, evolutionary stage, and apparent distance modulus of each target. Among the investigated cluster giants we find clear evidence of overmassive and undermassive members, and non-members with strong hints of potential past membership. Our results indicate that about 10 per cent of the red giants in the cluster have experienced mass transfer or a merger. High-resolution high-S/N spectroscopic follow-up could confirm potential past membership of the non-members, and reveal whether certain element abundances might expose the non-standard evolution of overmassive and undermassive stars. If so, field stars of similar type could be identified as what they are, i.e. overmassive or undermassive stars, and not mistakenly classified as younger or older than they are.

KW - open clusters and associations: individual: NGC 6791

KW - stars: evolution

KW - stars: fundamental parameters

KW - stars: oscillations

KW - stars: peculiar

U2 - 10.1093/mnras/stab2183

DO - 10.1093/mnras/stab2183

M3 - Journal article

AN - SCOPUS:85114994245

SN - 0035-8711

VL - 507

SP - 496

EP - 509

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Asteroseismology of overmassive, undermassive, and potential past members of the open cluster NGC 6791

Abstract

Keywords

Access to Document

Check availability with the Royal Danish Library

Fingerprint

Cite this