The first Delta a observations of three globular clusters

J 2014

The first Delta a observations of three globular clusters

PAUNZEN, Ernst, Ilian ILIEV, Olga PINTADO, Hubert BAUM, Hans-Michael MAITZEN et. al.

Základní údaje

Originální název

The first Delta a observations of three globular clusters

Autoři

PAUNZEN, Ernst (40 Rakousko, garant, domácí), Ilian ILIEV (100 Bulharsko), Olga PINTADO (32 Argentina), Hubert BAUM (40 Rakousko), Hans-Michael MAITZEN (40 Rakousko), Martin NETOPIL (40 Rakousko, domácí), Anna ONEHAG (752 Švédsko), Miloslav ZEJDA (203 Česká republika, domácí) a Luciano FRAGA (76 Brazílie)

Vydání

Monthly Notices of the Royal Astronomical Society, MALDEN, WILEY, 2014, 0035-8711

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 5.107

Kód RIV

RIV/00216224:14310/14:00074199

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1093/mnras/stu1276

UT WoS

000342920400045

Klíčová slova anglicky

techniques: photometric; stars: chemically peculiar; stars: horizontal branch; globular clusters: individual: NGC 104; globular clusters: individual: NGC 6205; globular clusters: individual: NGC 7099

Štítky

AKR, rivok

Změněno: 11. 4. 2015 16:49, Ing. Andrea Mikešková

Anotace

V originále

Globular clusters are main astrophysical laboratories to test and modify evolutionary models. Thought to be rather homogeneous in their local elemental Distribution of members, results suggest a wide variety of chemical peculiarities. Besides different main sequences, believed to be caused by different helium abundances, peculiarities of blue horizontal-branch stars and on the red giant branch were found. This whole zoo of peculiar objects has to be explained in the context of stellar formation and evolution. The tool of Delta a photometry is employed in order to detect peculiar stars in the whole spectral range. This three filter narrow band system measures the flux distribution in the region from 4900 to 5600A in order to find any peculiarities around 5200A. It is highly efficient to detect classical chemically peculiar stars of the upper main sequence, Be/Ae, shell and metal-weak objects in the Milky Way and Magellanic Clouds. We present Delta a photometry of 2266 stars from 109 individual frames for three globular Clusters (NGC 104, NGC 6205, and NGC 7099). A comparison with published abundances, for three horizontal-branch stars, only, yield an excellent agreement. According to the 3 sigma detection limit of each globular cluster, about 3% of the stars lie in abnormal regions in the diagnostic diagrams. The first observations of three widely different aggregates give very promising results, which will serve as a solid basis for follow-up observations including photometric as well as spectroscopic studies.

Návaznosti

GAP209/12/0217, projekt VaV

Název: Multispektrální proměnnost horkých hvězd a její příčiny

Investor: Grantová agentura ČR, Multispektrální proměnnost horkých hvězd a její příčiny

GP14-26115P, projekt VaV

Název: Vstříc k jednotné škále metalicity pro otevřené hvězdokupy

Investor: Grantová agentura ČR, Vstříc k jednotné škále metalicity pro otevřené hvězdokupy

3SGA5916, interní kód MU

Název: Hvězdy a hvězdokupy v Magellanových mračnech (Akronym: Webda MaC)

Investor: Jihomoravský kraj, Hvězdy a hvězdokupy v Magellanových mračnech, Granty pro zahraniční vědce

7AMB14AT015, projekt VaV

Název: Nový pohled na magnetické hvězdy (Akronym: MAGSTARS)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Nový pohled na magnetické hvězdy

Citovat

PAUNZEN, Ernst, Ilian ILIEV, Olga PINTADO, Hubert BAUM, Hans-Michael MAITZEN, Martin NETOPIL, Anna ONEHAG, Miloslav ZEJDA a Luciano FRAGA. The first Delta a observations of three globular clusters. Monthly Notices of the Royal Astronomical Society. MALDEN: WILEY, 2014, roč. 443, č. 3, s. 2492-2498. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stu1276.

@article{1213401,
   author = {Paunzen, Ernst and Iliev, Ilian and Pintado, Olga and Baum, Hubert and Maitzen, HansandMichael and Netopil, Martin and Onehag, Anna and Zejda, Miloslav and Fraga, Luciano},
   article_location = {MALDEN},
   article_number = {3},
   doi = {http://dx.doi.org/10.1093/mnras/stu1276},
   keywords = {techniques: photometric; stars: chemically peculiar; stars: horizontal branch; globular clusters: individual: NGC 104; globular clusters: individual: NGC 6205; globular clusters: individual: NGC 7099},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {The first Delta a observations of three globular clusters},
   volume = {443},
   year = {2014}
}

TY  - JOUR
ID  - 1213401
AU  - Paunzen, Ernst - Iliev, Ilian - Pintado, Olga - Baum, Hubert - Maitzen, Hans-Michael - Netopil, Martin - Onehag, Anna - Zejda, Miloslav - Fraga, Luciano
PY  - 2014
TI  - The first Delta a observations of three globular clusters
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 443
IS  - 3
SP  - 2492-2498
EP  - 2492-2498
PB  - WILEY
SN  - 00358711
KW  - techniques: photometric
KW  - stars: chemically peculiar
KW  - stars: horizontal branch
KW  - globular clusters: individual: NGC 104
KW  - globular clusters: individual: NGC 6205
KW  - globular clusters: individual: NGC 7099
N2  - Globular clusters are main astrophysical laboratories to test and modify evolutionary models. Thought to be rather homogeneous in their local elemental Distribution of members, results suggest a wide variety of chemical peculiarities. Besides different main sequences, believed to be caused by different helium abundances, peculiarities of blue horizontal-branch stars and on the red giant branch were found. This whole zoo of peculiar objects has to be explained in the context of stellar formation and evolution. The tool of Delta a photometry is employed in order to detect peculiar stars in the whole spectral range. This three filter narrow band system measures the flux distribution in the region from 4900 to 5600A in order to find any peculiarities around 5200A. It is highly efficient to detect classical chemically peculiar stars of the upper main sequence, Be/Ae, shell and metal-weak objects in the Milky Way and Magellanic Clouds. We present Delta a photometry of 2266 stars from 109 individual frames for three globular Clusters (NGC 104, NGC 6205, and NGC 7099). A comparison with published abundances, for three horizontal-branch stars, only, yield an excellent agreement. According to the 3 sigma detection limit of each globular cluster, about 3% of the stars lie in abnormal regions in the diagnostic diagrams. The first observations of three widely different aggregates give very promising results, which will serve as a solid basis for follow-up observations including photometric as well as spectroscopic studies.
ER  -

PAUNZEN, Ernst, Ilian ILIEV, Olga PINTADO, Hubert BAUM, Hans-Michael MAITZEN, Martin NETOPIL, Anna ONEHAG, Miloslav ZEJDA a Luciano FRAGA. The first Delta a observations of three globular clusters. \textit{Monthly Notices of the Royal Astronomical Society}. MALDEN: WILEY, 2014, roč.~443, č.~3, s.~2492-2498. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stu1276.

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