A search for peculiar stars in the open cluster Hogg 16

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00100714" target="_blank" >RIV/00216224:14310/18:00100714 - isvavai.cz</a>

Výsledek na webu

<a href="http://adsabs.harvard.edu/abs/2018NewA...58....1C" target="_blank" >http://adsabs.harvard.edu/abs/2018NewA...58....1C</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.newast.2017.07.002" target="_blank" >10.1016/j.newast.2017.07.002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A search for peculiar stars in the open cluster Hogg 16

Popis výsledku v původním jazyce

The study of chemically peculiar (CP) stars in open clusters provides valuable information about their evolutionary status. Their detection can be performed using the $Delta a$ photometric system, which maps a characteristic flux depression at $lambda sim 5200$ AA. This paper aims at studying the occurrence of CP stars in the earliest stages of evolution of a stellar population by applying this technique to Hogg 16, a very young Galactic open cluster (about 25 Myr). We identified several peculiar candidates: two B-type stars with a negative $Delta a$ index (CD-60 4701, CPD-60 4706) are likely emission-line (Be) stars, even though spectral measurements are necessary for a proper classification of the second one; a third object (CD-60 4703), identified as a Be candidate in literature, appears to be a background B-type supergiant with no significant $Delta a$ index, which does not rule out the possibility that it is indeed peculiar as the normality line of $Delta a$ for supergiants has not been studied in detail yet. A fourth object (CD-60 4699) appears to be a magnetic CP star of 8 M$_odot$, but obtained spectral data seem to rule out this hypothesis. Three more magnetic CP star candidates are found in the domain of early F-type stars. One is a probable nonmember and close to the border of significance, but the other two are probably pre-main sequence cluster objects. This is very promising, as it can lead to very strong constraints to the diffusion theory. Finally, we derived the fundamental parameters of Hogg 16 and provide for the first time an estimate of its metal content.

Název v anglickém jazyce

A search for peculiar stars in the open cluster Hogg 16

Popis výsledku anglicky

The study of chemically peculiar (CP) stars in open clusters provides valuable information about their evolutionary status. Their detection can be performed using the $Delta a$ photometric system, which maps a characteristic flux depression at $lambda sim 5200$ AA. This paper aims at studying the occurrence of CP stars in the earliest stages of evolution of a stellar population by applying this technique to Hogg 16, a very young Galactic open cluster (about 25 Myr). We identified several peculiar candidates: two B-type stars with a negative $Delta a$ index (CD-60 4701, CPD-60 4706) are likely emission-line (Be) stars, even though spectral measurements are necessary for a proper classification of the second one; a third object (CD-60 4703), identified as a Be candidate in literature, appears to be a background B-type supergiant with no significant $Delta a$ index, which does not rule out the possibility that it is indeed peculiar as the normality line of $Delta a$ for supergiants has not been studied in detail yet. A fourth object (CD-60 4699) appears to be a magnetic CP star of 8 M$_odot$, but obtained spectral data seem to rule out this hypothesis. Three more magnetic CP star candidates are found in the domain of early F-type stars. One is a probable nonmember and close to the border of significance, but the other two are probably pre-main sequence cluster objects. This is very promising, as it can lead to very strong constraints to the diffusion theory. Finally, we derived the fundamental parameters of Hogg 16 and provide for the first time an estimate of its metal content.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GP14-26115P" target="_blank" >GP14-26115P: Vstříc k jednotné škále metalicity pro otevřené hvězdokupy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

New Astronomy

ISSN

1384-1076

e-ISSN

1384-1092

Svazek periodika

58

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

1-9

Kód UT WoS článku

000412787300001

EID výsledku v databázi Scopus

2-s2.0-85029495169