The CoRoT chemical peculiar target star HD 49310

J 2015

The CoRoT chemical peculiar target star HD 49310

PAUNZEN, Ernst, Hans-Erich FRÖHLICH, Martin NETOPIL, Werner WEISS, Theresa LÜFTINGER et. al.

Základní údaje

Originální název

The CoRoT chemical peculiar target star HD 49310

Autoři

PAUNZEN, Ernst (40 Rakousko, garant, domácí), Hans-Erich FRÖHLICH (276 Německo), Martin NETOPIL (40 Rakousko, domácí), Werner WEISS (40 Rakousko) a Theresa LÜFTINGER (40 Rakousko)

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2015, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 4.378 v roce 2014

Kód RIV

RIV/00216224:14310/15:00080726

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/201424511

UT WoS

000349467000057

Klíčová slova anglicky

stars: chemically peculiar; stars: individual: HD 49310

Štítky

AKR, rivok

Změněno: 12. 4. 2016 15:13, Ing. Andrea Mikešková

Anotace

V originále

Context. The magnetic chemically peculiar (CP) stars of the upper main sequence are well-suited laboratories for investigating the influence of local magnetic fields on the stellar surface because they produce inhomogeneities (spots) that can be investigated in detail as the star rotates. Aims. We studied the inhomogeneous surface structure of the CP2 star HD 49310 based on high-quality CoRoT photometry obtained during 25 days. The data have nearly no gaps. This analysis is similar to a spectroscopic Doppler-imaging analysis, but it is not a tomographic method. Methods. We performed detailed light-curve fitting in terms of stationary circular bright spots. Furthermore, we derived astrophysical parameters with which we located HD 49310 within the Hertzsprung-Russell diagram. We also investigated the possible connection of this star to the nearby young open cluster NGC 2264. Results. With a Bayesian technique, we produced a surface map that shows six bright spots. After removing some artefacts, the residuals of the observed and synthetic photometric data are +/- 0.123 mmag. The rotational period of the star is P = 1.91909 +/- 0.00001 days. Our photometric observations therefore cover about 13 full rotational cycles. Three spots are very large with diameters of similar or equal to 40 deg. The spots are brighter by 40% than the unperturbed stellar photosphere. Conclusions. HD 49310 is a classical silicon (CP2) star with a mass of about 3 M-circle dot. It is not a member of NGC 2264. Our analysis shows the potential of using high-quality photometric data to analyse the surface structure of CP stars. A comprehensive analysis of similar archival data, preferrably from space missions, would contribute significantly to our understanding of surface phenomena of CP stars and their temporal evolution.

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

PAUNZEN, Ernst, Hans-Erich FRÖHLICH, Martin NETOPIL, Werner WEISS a Theresa LÜFTINGER. The CoRoT chemical peculiar target star HD 49310. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2015, roč. 574, February, s. "nestránkováno", 5 s. ISSN 0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201424511.

@article{1231953,
   author = {Paunzen, Ernst and Fröhlich, HansandErich and Netopil, Martin and Weiss, Werner and Lüftinger, Theresa},
   article_location = {LES ULIS CEDEX A},
   article_number = {February},
   doi = {http://dx.doi.org/10.1051/0004-6361/201424511},
   keywords = {stars: chemically peculiar; stars: individual: HD 49310},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {The CoRoT chemical peculiar target star HD 49310},
   volume = {574},
   year = {2015}
}

TY  - JOUR
ID  - 1231953
AU  - Paunzen, Ernst - Fröhlich, Hans-Erich - Netopil, Martin - Weiss, Werner - Lüftinger, Theresa
PY  - 2015
TI  - The CoRoT chemical peculiar target star HD 49310
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 574
IS  - February
SP  - "nestránkováno"
EP  - "nestránkováno"
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - stars: chemically peculiar
KW  - stars: individual: HD 49310
N2  - Context. The magnetic chemically peculiar (CP) stars of the upper main sequence are well-suited laboratories for investigating the influence of local magnetic fields on the stellar surface because they produce inhomogeneities (spots) that can be investigated in detail as the star rotates. Aims. We studied the inhomogeneous surface structure of the CP2 star HD 49310 based on high-quality CoRoT photometry obtained during 25 days. The data have nearly no gaps. This analysis is similar to a spectroscopic Doppler-imaging analysis, but it is not a tomographic method. Methods. We performed detailed light-curve fitting in terms of stationary circular bright spots. Furthermore, we derived astrophysical parameters with which we located HD 49310 within the Hertzsprung-Russell diagram. We also investigated the possible connection of this star to the nearby young open cluster NGC 2264. Results. With a Bayesian technique, we produced a surface map that shows six bright spots. After removing some artefacts, the residuals of the observed and synthetic photometric data are +/- 0.123 mmag. The rotational period of the star is P = 1.91909 +/- 0.00001 days. Our photometric observations therefore cover about 13 full rotational cycles. Three spots are very large with diameters of similar or equal to 40 deg. The spots are brighter by 40% than the unperturbed stellar photosphere. Conclusions. HD 49310 is a classical silicon (CP2) star with a mass of about 3 M-circle dot. It is not a member of NGC 2264. Our analysis shows the potential of using high-quality photometric data to analyse the surface structure of CP stars. A comprehensive analysis of similar archival data, preferrably from space missions, would contribute significantly to our understanding of surface phenomena of CP stars and their temporal evolution.
ER  -

PAUNZEN, Ernst, Hans-Erich FRÖHLICH, Martin NETOPIL, Werner WEISS a Theresa LÜFTINGER. The CoRoT chemical peculiar target star HD 49310. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2015, roč.~574, February, s.~''nestránkováno'', 5 s. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201424511.

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