Isochrone fitting of Galactic globular clusters - III. NGC 288, NGC 362, and NGC 6218 (M12)

Standard

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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 508, No. 2, 01.12.2021, p. 2688-2705.

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

BibTeX

@article{3a42db8fe8414b8bb01ed37333eecd7e,

title = "Isochrone fitting of Galactic globular clusters - III. NGC 288, NGC 362, and NGC 6218 (M12)",

abstract = "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.",

keywords = "Hertzsprung-Russell and colour-magnitude diagrams, dust, extinction, globular clusters: general, globular clusters: individual: NGC 288, NGC 362, NGC 6218 (M12), HORIZONTAL-BRANCH STARS, I., COLOR-MAGNITUDE DIAGRAM, ACS SURVEY, POPULATIONS, Russell and colour, STELLAR EVOLUTION MODELS, magnitude diagrams, GAIA EDR3, CATALOG, Hertzsprung, UV LEGACY SURVEY, EXTINCTION",

author = "Георгий Гончаров and Ховричев, {Максим Юрьевич} and Мосенков, {Александр Владимирович} and Ильин, {Владимир Борисович} and Марчук, {Александр Александрович} and Савченко, {Сергей Сергеевич} and Смирнов, {Антон Александрович} and Усачев, {Павел Александрович} and Поляков, {Денис Михайлович}",

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

year = "2021",

month = dec,

day = "1",

doi = "10.1093/mnras/stab2756",

language = "English",

volume = "508",

pages = "2688--2705",

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

issn = "0035-8711",

publisher = "Wiley-Blackwell",

number = "2",

}

RIS

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

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