A probable pre-main sequence chemically peculiar star in the
open cluster Stock 16

J 2014

A probable pre-main sequence chemically peculiar star in the open cluster Stock 16

NETOPIL, Martin; Luca FOSSATI; Ernst PAUNZEN; Konstanze ZWINTZ; Olga PINTADO et al.

Základní údaje

Originální název

A probable pre-main sequence chemically peculiar star in the open cluster Stock 16

Autoři

NETOPIL, Martin; Luca FOSSATI; Ernst PAUNZEN; Konstanze ZWINTZ; Olga PINTADO a Stefano BAGNULO

Vydání

Monthly Notices of the Royal Astronomical Society, 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

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/14:00073926

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

stars: abundances; stars: chemically peculiar; stars: individual: Stock 16-12; stars: pre-main-sequence; open clusters and associations: individual: Stock 16

Štítky

AKR, rivok

Změněno: 20. 1. 2015 15:10, Ing. Andrea Mikešková

Anotace

V originále

We used the Ultraviolet and Visual Echelle Spectrograph of the ESO-Very Large Telescope to obtain a high resolution and high signal-to-noise ratio spectrum of Stock 16-12, an early-type star which previous Delta a photometric observations suggest being a chemically peculiar (CP) star. We used spectral synthesis to perform a detailed abundance analysis obtaining an effective temperature of 8400 +/- 400 K, a surface gravity of 4.1 +/- 0.4, a microturbulence velocity of 3.4(-0.3)(+0.7) km/s, and a projected rotational velocity of 68 +/- 4 km/s. We provide photometric and spectroscopic evidence showing the star is most likely a member of the young Stock 16 open cluster (age 3-8 Myr). The probable cluster membership, the star's position in the Hertzsprung-Russell diagram, and the found infrared excess strongly suggest the star is still in the pre-main-sequence (PMS) phase. We used PMS evolutionary tracks to determine the stellar mass, which ranges between 1.95 and 2.3 M(Sun), depending upon the adopted spectroscopic or photometric data results. Similarly, we obtained a stellar age ranging between 4 and 6 Myr, in agreement with that of the cluster. Because the star's chemical abundance pattern resembles well that known of main sequence CP metallic line (Am) stars, the object sets important constraints to the diffusion theory. Additional spectroscopic and spectropolarimetric data allowed us to conclude that the object is probably a single non-magnetic star.

Návaznosti

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

NETOPIL, Martin; Luca FOSSATI; Ernst PAUNZEN; Konstanze ZWINTZ; Olga PINTADO a Stefano BAGNULO. A probable pre-main sequence chemically peculiar star in the open cluster Stock 16. Monthly Notices of the Royal Astronomical Society. 2014, roč. 442, č. 4, s. 3761-3768. ISSN 0035-8711. Dostupné z: https://doi.org/10.1093/mnras/stu1130.

@article{1200177,
   author = {Netopil, Martin and Fossati, Luca and Paunzen, Ernst and Zwintz, Konstanze and Pintado, Olga and Bagnulo, Stefano},
   article_number = {4},
   doi = {https://doi.org/10.1093/mnras/stu1130},
   keywords = {stars: abundances; stars: chemically peculiar; stars: individual: Stock 16-12; stars: pre-main-sequence; open clusters and associations: individual: Stock 16},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {A probable pre-main sequence chemically peculiar star in the open cluster Stock 16},
   volume = {442},
   year = {2014}
}

TY  - JOUR
ID  - 1200177
AU  - Netopil, Martin - Fossati, Luca - Paunzen, Ernst - Zwintz, Konstanze - Pintado, Olga - Bagnulo, Stefano
PY  - 2014
TI  - A probable pre-main sequence chemically peculiar star in the open cluster Stock 16
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 442
IS  - 4
SP  - 3761-3768
EP  - 3761-3768
SN  - 00358711
KW  - stars: abundances
KW  - stars: chemically peculiar
KW  - stars: individual: Stock 16-12
KW  - stars: pre-main-sequence
KW  - open clusters and associations: individual: Stock 16
N2  - We used the Ultraviolet and Visual Echelle Spectrograph of the ESO-Very Large Telescope to obtain a high resolution and high signal-to-noise ratio spectrum of Stock 16-12, an early-type star which previous Delta a photometric observations suggest being a chemically peculiar (CP) star. We used spectral synthesis to perform a detailed abundance analysis obtaining an effective temperature of 8400 +/- 400 K, a surface gravity of 4.1 +/- 0.4, a microturbulence velocity of 3.4(-0.3)(+0.7) km/s, and a projected rotational velocity of 68 +/- 4 km/s. We provide photometric and spectroscopic evidence showing the star is most likely a member of the young Stock 16 open cluster (age 3-8 Myr). The probable cluster membership, the star's position in the Hertzsprung-Russell diagram, and the found infrared excess strongly suggest the star is still in the pre-main-sequence (PMS) phase. We used PMS evolutionary tracks to determine the stellar mass, which ranges between 1.95 and 2.3 M(Sun), depending upon the adopted spectroscopic or photometric data results. Similarly, we obtained a stellar age ranging between 4 and 6 Myr, in agreement with that of the cluster. Because the star's chemical abundance pattern resembles well that known of main sequence CP metallic line (Am) stars, the object sets important constraints to the diffusion theory. Additional spectroscopic and spectropolarimetric data allowed us to conclude that the object is probably a single non-magnetic star.
ER  -

NETOPIL, Martin; Luca FOSSATI; Ernst PAUNZEN; Konstanze ZWINTZ; Olga PINTADO a Stefano BAGNULO. A probable pre-main sequence chemically peculiar star in the open cluster Stock 16. \textit{Monthly Notices of the Royal Astronomical Society}. 2014, roč.~442, č.~4, s.~3761-3768. ISSN~0035-8711. Dostupné z: https://doi.org/10.1093/mnras/stu1130.

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