Investigating the possible connection between lambda Bootis
stars and intermediate Population II type stars

J 2014

Investigating the possible connection between lambda Bootis stars and intermediate Population II type stars

PAUNZEN, Ernst; Ilian ILIEV; Luca FOSSATI; Ulrike HEITER; Werner WEISS et. al.

Basic information

Original name

Investigating the possible connection between lambda Bootis stars and intermediate Population II type stars

Authors

PAUNZEN, Ernst (40 Austria, guarantor, belonging to the institution); Ilian ILIEV (100 Bulgaria); Luca FOSSATI (380 Italy); Ulrike HEITER (752 Sweden) and Werner WEISS (40 Austria)

Edition

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2014, 0004-6361

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

is not subject to a state or trade secret

Impact factor

Impact factor: 4.378

RIV identification code

RIV/00216224:14310/14:00077782

Organization unit

Faculty of Science

DOI

https://doi.org/10.1051/0004-6361/201423817

UT WoS

000341185300121

EID Scopus

2-s2.0-84904212219

Keywords in English

stars: abundances; stars: chemically peculiar; stars: early-type; stars: Population II

Abstract

In the original language

The lambda Bootis (LB) stars are located at the upper main sequence of the H-R diagram and exhibit a peculiar abundance pattern. The light elements (C, N, O, and S) present solar abundances whereas all other elements are moderately to strongly underabundant. It has not yet been determined whether that abundance pattern is intrinsic, or is restricted to the stellar surface. If we follow the hypothesis that the LB stars are intrinsically metal-weak, then there should be a connection with the intermediate Population II and F-weak objects. Such a possible affinity has not been previously investigated. We present detailed elemental abundances, including those of the light elements carbon and oxygen, for 38 bright intermediate Population II and F-weak objects. In addition, we investigate the kinematic characteristics of the groups. From photometric, spectroscopic, and kinematic data, there is no distinction between the intermediate Population II and F-weak type stars. We therefore conclude that the two groups are identical. However, it is possible to distinguish the LB stars from the intermediate Population II stars on the basis of elemental abundances, though not in terms of their kinematics. The LB stars seem to be distinct from the intermediate Population II group. Further asteroseismologic investigations and analyses of spectroscopic binary systems are needed to strengthen this conclusion.

Links

3SGA5916, interní kód MU

Name: Hvězdy a hvězdokupy v Magellanových mračnech (Acronym: Webda MaC)

Investor: South-Moravian Region, Incoming grants

7AMB14AT015, research and development project

Name: Nový pohled na magnetické hvězdy (Acronym: MAGSTARS)

Investor: Ministry of Education, Youth and Sports of the CR

Cite

PAUNZEN, Ernst; Ilian ILIEV; Luca FOSSATI; Ulrike HEITER and Werner WEISS. Investigating the possible connection between lambda Bootis stars and intermediate Population II type stars. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2014, vol. 567, No 7, p. 67 - 74. ISSN 0004-6361. Available from: https://doi.org/10.1051/0004-6361/201423817.

@article{1213400,
   author = {Paunzen, Ernst and Iliev, Ilian and Fossati, Luca and Heiter, Ulrike and Weiss, Werner},
   article_location = {LES ULIS CEDEX A},
   article_number = {7},
   doi = {https://doi.org/10.1051/0004-6361/201423817},
   keywords = {stars: abundances; stars: chemically peculiar; stars: early-type; stars: Population II},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Investigating the possible connection between lambda Bootis stars and intermediate Population II type stars},
   volume = {567},
   year = {2014}
}

TY  - JOUR
ID  - 1213400
AU  - Paunzen, Ernst - Iliev, Ilian - Fossati, Luca - Heiter, Ulrike - Weiss, Werner
PY  - 2014
TI  - Investigating the possible connection between lambda Bootis stars and intermediate Population II type stars
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 567
IS  - 7
SP  - 67 - 74
EP  - 67 - 74
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - stars: abundances
KW  - stars: chemically peculiar
KW  - stars: early-type
KW  - stars: Population II
N2  - The lambda Bootis (LB) stars are located at the upper main sequence of the H-R diagram and exhibit a peculiar abundance pattern. The light elements (C, N, O, and S) present solar abundances whereas all other elements are moderately to strongly underabundant. It has not yet been determined whether that abundance pattern is intrinsic, or is restricted to the stellar surface. If we follow the hypothesis that the LB stars are intrinsically metal-weak, then there should be a connection with the intermediate Population II and F-weak objects. Such a possible affinity has not been previously investigated. We present detailed elemental abundances, including those of the light elements carbon and oxygen, for 38 bright intermediate Population II and F-weak objects. In addition, we investigate the kinematic characteristics of the groups. From photometric, spectroscopic, and kinematic data, there is no distinction between the intermediate Population II and F-weak type stars. We therefore conclude that the two groups are identical. However, it is possible to distinguish the LB stars from the intermediate Population II stars on the basis of elemental abundances, though not in terms of their kinematics. The LB stars seem to be distinct from the intermediate Population II group. Further asteroseismologic investigations and analyses of spectroscopic binary systems are needed to strengthen this conclusion.
ER  -

PAUNZEN, Ernst; Ilian ILIEV; Luca FOSSATI; Ulrike HEITER and Werner WEISS. Investigating the possible connection between lambda Bootis stars and intermediate Population II type stars. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2014, vol.~567, No~7, p.~67 - 74. ISSN~0004-6361. Available from: https://doi.org/10.1051/0004-6361/201423817.

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