A search for peculiar stars in the open cluster Hogg 16

J 2018

A search for peculiar stars in the open cluster Hogg 16

CARIDDI, Stefano, Naira M. AZATYAN, Petr KURFÜRST, Lýdia ŠTOFANOVÁ, Martin NETOPIL et. al.

Basic information

Original name

A search for peculiar stars in the open cluster Hogg 16

Authors

CARIDDI, Stefano (380 Italy), Naira M. AZATYAN (51 Armenia), Petr KURFÜRST (203 Czech Republic, belonging to the institution), Lýdia ŠTOFANOVÁ (703 Slovakia), Martin NETOPIL (40 Austria, guarantor, belonging to the institution), Ernst PAUNZEN (40 Austria, belonging to the institution), Olga I. PINTADO (32 Argentina) and Yael J. AIDELMAN (32 Argentina)

Edition

New Astronomy, Amsterdam, ELSEVIER, 2018, 1384-1076

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 1.162

RIV identification code

RIV/00216224:14310/18:00100714

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.newast.2017.07.002

UT WoS

000412787300001

Keywords in English

Open clusters and associations: individual (Hogg 16); Stars: chemically peculiar; Stars: emission-line; Be; Techniques: photometric

Abstract

V originále

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.

Links

GP14-26115P, research and development project

Name: Vstříc k jednotné škále metalicity pro otevřené hvězdokupy

Investor: Czech Science Foundation

Citovat

CARIDDI, Stefano, Naira M. AZATYAN, Petr KURFÜRST, Lýdia ŠTOFANOVÁ, Martin NETOPIL, Ernst PAUNZEN, Olga I. PINTADO and Yael J. AIDELMAN. A search for peculiar stars in the open cluster Hogg 16. New Astronomy. Amsterdam: ELSEVIER, 2018, vol. 58, January, p. 1-9. ISSN 1384-1076. Available from: https://dx.doi.org/10.1016/j.newast.2017.07.002.

@article{1385182,
   author = {Cariddi, Stefano and Azatyan, Naira M. and Kurfürst, Petr and Štofanová, Lýdia and Netopil, Martin and Paunzen, Ernst and Pintado, Olga I. and Aidelman, Yael J.},
   article_location = {Amsterdam},
   article_number = {January},
   doi = {http://dx.doi.org/10.1016/j.newast.2017.07.002},
   keywords = {Open clusters and associations: individual (Hogg 16); Stars: chemically peculiar; Stars: emission-line; Be; Techniques: photometric},
   language = {eng},
   issn = {1384-1076},
   journal = {New Astronomy},
   title = {A search for peculiar stars in the open cluster Hogg 16},
   url = {http://adsabs.harvard.edu/abs/2018NewA...58....1C},
   volume = {58},
   year = {2018}
}

TY  - JOUR
ID  - 1385182
AU  - Cariddi, Stefano - Azatyan, Naira M. - Kurfürst, Petr - Štofanová, Lýdia - Netopil, Martin - Paunzen, Ernst - Pintado, Olga I. - Aidelman, Yael J.
PY  - 2018
TI  - A search for peculiar stars in the open cluster Hogg 16
JF  - New Astronomy
VL  - 58
IS  - January
SP  - 1-9
EP  - 1-9
PB  - ELSEVIER
SN  - 13841076
KW  - Open clusters and associations: individual (Hogg 16)
KW  - Stars: chemically peculiar
KW  - Stars: emission-line
KW  - Be
KW  - Techniques: photometric
UR  - http://adsabs.harvard.edu/abs/2018NewA...58....1C
L2  - http://adsabs.harvard.edu/abs/2018NewA...58....1C
N2  - 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.
ER  -

CARIDDI, Stefano, Naira M. AZATYAN, Petr KURFÜRST, Lýdia ŠTOFANOVÁ, Martin NETOPIL, Ernst PAUNZEN, Olga I. PINTADO and Yael J. AIDELMAN. A search for peculiar stars in the open cluster Hogg 16. \textit{New Astronomy}. Amsterdam: ELSEVIER, 2018, vol.~58, January, p.~1-9. ISSN~1384-1076. Available from: https://dx.doi.org/10.1016/j.newast.2017.07.002.

Detailed Information on Publication Record