Near-infrared Spectra of a Sample of Galactic Unclassified B[e] Stars

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F18%3A00497486" target="_blank" >RIV/67985815:_____/18:00497486 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/1538-3873/aadf23" target="_blank" >http://dx.doi.org/10.1088/1538-3873/aadf23</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1538-3873/aadf23" target="_blank" >10.1088/1538-3873/aadf23</a>

Result language

angličtina

Original language name

Near-infrared Spectra of a Sample of Galactic Unclassified B[e] Stars

Original language description

B[e] stars are surrounded by cool and dense circumstellar environments where molecules and dust are formed. These stars are rare and display complex spectra whose photospheric features are frequently veiled by their circumstellar envelopes, making it difficult to assign them spectral types and evolutionary phases. On the basis of a detailed analysis of medium-resolution spectra in the near-infrared region, together with optical observations and available data from astronomical databases, we attempt to improve their spectral classification and infer the properties of their circumstellar environments. To this aim, we have selected a group of five bright IRAS sources (IRAS 02155+6410, MWC 728, AS 119, MWC 819, and IRAS 07080+0605): one star with large infrared excess and four unclassified B[e] stars or FS CMa stars, most of which have been poorly studied. We present and describe our observations and discuss possible classifications of the sample objects. For all stars, medium-resolution spectra in the region of 2.17-2.39 pm and in the L band are shown for the first time. Infrared features, such as the absorption molecular CO bands and metallic lines, reveal the presence of a late-type companion in MWC 728, and suggest the possible binary nature in AS 119. IRAS 07080+0605 shows evidence of a surrounding cool CO molecular cloud. CS molecular emission may be present in MWC 819 L-band spectra. We suggest that this object is a protoplanetary nebulae.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA17-02337S" target="_blank" >GA17-02337S: Molecules in the environments of evolved massive stars</a><br>

Continuities

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

Publication year

2018

Confidentiality

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

Name of the periodical

Publications of the Astronomical Society of the Pacific

ISSN

0004-6280

e-ISSN

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Volume of the periodical

130

Issue of the periodical within the volume

993

Country of publishing house

GB - UNITED KINGDOM

Number of pages

18

Pages from-to

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UT code for WoS article

000446192500001

EID of the result in the Scopus database

2-s2.0-85055501835