Near-infrared Characterization of Four Massive Stars in Transition Phases*

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00533943" target="_blank" >RIV/67985815:_____/20:00533943 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3847/1538-3881/abae62" target="_blank" >https://doi.org/10.3847/1538-3881/abae62</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-3881/abae62" target="_blank" >10.3847/1538-3881/abae62</a>

Result language

angličtina

Original language name

Near-infrared Characterization of Four Massive Stars in Transition Phases*

Original language description

Massive stars typically undergo short-lived post-main-sequence evolutionary phases with strong mass loss and occasional mass eruptions. Many of such massive stars in transition phases have been identified based on their dusty envelopes. The ejected material often veils the stellar photospheres so that the central stars cannot be assigned proper spectral types and evolutionary stages. The infrared spectral range has proved to be ideal for the classification of evolved massive stars and for the characterization of their environments. To improve our knowledge on the central stars of four such dust-enshrouded objects, [GKF 2010] MN 83, [GKF 2010] MN 108, [GKF 2010] MN 109, and [GKF 2010] MN 112, we collect and present their first medium-resolutionK-band spectra in the 2.3-2.47 mu m region and discuss the location of the stars in theJHKcolor-color diagram. We find that the emission-line spectra of both MN 83 and MN 112 show characteristics typically seen in luminous blue variable (LBV) stars. In addition, we propose that the presence and strength of the newly reported Mg iilines might be used as a new complementary criterion to identify LBV candidates. The spectra of the other two objects imply that MN 108 is an O-type supergiant, whereas MN 109 could be an LBV candidate in its active phase. We derive lower limits for the reddening toward the stars and find that three of all dereddened fall into the region of confirmed LBVs.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA20-00150S" target="_blank" >GA20-00150S: Structure and evolution of stellar ejecta</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Astronomical Journal

ISSN

1538-3881

e-ISSN

—

Volume of the periodical

160

Issue of the periodical within the volume

4

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

166

UT code for WoS article

000574477500001

EID of the result in the Scopus database

2-s2.0-85092662064