Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Isochrone fitting of Galactic globular clusters - III. NGC 288, NGC 362, and NGC 6218 (M12). / Гончаров, Георгий; Ховричев, Максим Юрьевич; Мосенков, Александр Владимирович; Ильин, Владимир Борисович; Марчук, Александр Александрович; Савченко, Сергей Сергеевич; Смирнов, Антон Александрович; Усачев, Павел Александрович; Поляков, Денис Михайлович.
в: Monthly Notices of the Royal Astronomical Society, Том 508, № 2, 01.12.2021, стр. 2688-2705.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Isochrone fitting of Galactic globular clusters - III. NGC 288, NGC 362, and NGC 6218 (M12)
AU - Гончаров, Георгий
AU - Ховричев, Максим Юрьевич
AU - Мосенков, Александр Владимирович
AU - Ильин, Владимир Борисович
AU - Марчук, Александр Александрович
AU - Савченко, Сергей Сергеевич
AU - Смирнов, Антон Александрович
AU - Усачев, Павел Александрович
AU - Поляков, Денис Михайлович
N1 - Publisher Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - We present new isochrone fits to colour-magnitude diagrams of the Galactic globular clusters NGC 288, NGC 362, and NGC 6218 (M12). We utilize a lot of photometric bands from the ultraviolet to mid-infrared by use of data from the HST, Gaia, unWISE, Pan-STARRS, and other photometric sources. In our isochrone fitting, we use theoretical models and isochrones from the Dartmouth Stellar Evolution Program and Bag of Stellar Tracks and Isochrones for α-enhanced abundance [α/Fe] = +0.40, different helium abundances, and a metallicity of about [Fe/H] = -1.3 adopted from the literature. We derive the most probable distances 8.96 ± 0.05, 8.98 ± 0.06, and 5.04 ± 0.05 kpc, ages 13.5 ± 1.1, 11.0 ± 0.6, and 13.8 ± 1.1 Gyr, extinctions AV = 0.08 ± 0.03, 0.11 ± 0.04, and 0.63 ± 0.03 mag, and reddenings E(B - V) = 0.014 ± 0.010, 0.028 ± 0.011, and 0.189 ± 0.010 mag for NGC 288, NGC 362, and NGC 6218, respectively. The distance estimates from the different models are consistent, while those of age, extinction, and reddening are not. The uncertainties of age, extinction, and reddening are dominated by some intrinsic systematic differences between the models. However, the models agree in their relative age estimates: NGC 362 is 2.6 ± 0.5 Gyr younger than NGC 288 and 2.8 ± 0.5 Gyr younger than NGC 6218, confirming age as the second parameter for these clusters. We provide reliable lists of the cluster members and precise cluster proper motions from the Gaia Early Data Release 3.
AB - We present new isochrone fits to colour-magnitude diagrams of the Galactic globular clusters NGC 288, NGC 362, and NGC 6218 (M12). We utilize a lot of photometric bands from the ultraviolet to mid-infrared by use of data from the HST, Gaia, unWISE, Pan-STARRS, and other photometric sources. In our isochrone fitting, we use theoretical models and isochrones from the Dartmouth Stellar Evolution Program and Bag of Stellar Tracks and Isochrones for α-enhanced abundance [α/Fe] = +0.40, different helium abundances, and a metallicity of about [Fe/H] = -1.3 adopted from the literature. We derive the most probable distances 8.96 ± 0.05, 8.98 ± 0.06, and 5.04 ± 0.05 kpc, ages 13.5 ± 1.1, 11.0 ± 0.6, and 13.8 ± 1.1 Gyr, extinctions AV = 0.08 ± 0.03, 0.11 ± 0.04, and 0.63 ± 0.03 mag, and reddenings E(B - V) = 0.014 ± 0.010, 0.028 ± 0.011, and 0.189 ± 0.010 mag for NGC 288, NGC 362, and NGC 6218, respectively. The distance estimates from the different models are consistent, while those of age, extinction, and reddening are not. The uncertainties of age, extinction, and reddening are dominated by some intrinsic systematic differences between the models. However, the models agree in their relative age estimates: NGC 362 is 2.6 ± 0.5 Gyr younger than NGC 288 and 2.8 ± 0.5 Gyr younger than NGC 6218, confirming age as the second parameter for these clusters. We provide reliable lists of the cluster members and precise cluster proper motions from the Gaia Early Data Release 3.
KW - Hertzsprung-Russell and colour-magnitude diagrams
KW - dust, extinction
KW - globular clusters: general
KW - globular clusters: individual: NGC 288, NGC 362, NGC 6218 (M12)
KW - HORIZONTAL-BRANCH STARS
KW - I.
KW - COLOR-MAGNITUDE DIAGRAM
KW - ACS SURVEY
KW - POPULATIONS
KW - Russell and colour
KW - STELLAR EVOLUTION MODELS
KW - magnitude diagrams
KW - GAIA EDR3
KW - CATALOG
KW - Hertzsprung
KW - UV LEGACY SURVEY
KW - EXTINCTION
UR - http://www.scopus.com/inward/record.url?scp=85119044587&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/350bfd3a-cf59-3eac-934e-a6133aab1df6/
U2 - 10.1093/mnras/stab2756
DO - 10.1093/mnras/stab2756
M3 - Article
VL - 508
SP - 2688
EP - 2705
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -
ID: 86312059