Resolving the Circumstellar Environment of the Galactic B[e] Supergiant Star MWC 137. II. Nebular Kinematics and Stellar Variability
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F21%3A00548198" target="_blank" >RIV/67985815:_____/21:00548198 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/1538-3881/ac1355" target="_blank" >https://doi.org/10.3847/1538-3881/ac1355</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-3881/ac1355" target="_blank" >10.3847/1538-3881/ac1355</a>
Alternative languages
Result language
angličtina
Original language name
Resolving the Circumstellar Environment of the Galactic B[e] Supergiant Star MWC 137. II. Nebular Kinematics and Stellar Variability
Original language description
The Galactic B[e] supergiant MWC137 is surrounded by a large-scale optical nebula. To shed light on the physical conditions and kinematics of the nebula, we analyze the optical forbidden emission lines [N II] lambda lambda 6548,6583 and [S II] lambda lambda 6716,6731 in long-slit spectra taken with ALFOSC at the Nordic Optical Telescope. The radial velocities display a complex behavior but, in general, the northern nebular features are predominantly approaching while the southern ones are mostly receding. The electron density shows strong variations across the nebula with values spreading from about zero to similar to 800 cm(-3). Higher densities are found closer to MWC137 and in regions of intense emission, whereas in regions with high radial velocities the density decreases significantly. We also observe the entire nebula in the two [S II] lines with the scanning Fabry-Perot interferometer attached to the 6 m telescope of the Special Astrophysical Observatory. These data reveal a new bow-shaped feature at P.A. = 225 degrees-245 degrees and a distance 80 '' from MWC137. A new H alpha image has been taken with the Danish 1.54 m telescope on La Silla. No expansion or changes in the nebular morphology appear within 18.1 yr. We derive a mass of 37(-5)(+9) M-circle dot. and an age of 4.7 +/- 0.8 Myr for MWC137. Furthermore, we detect a period of 1.93 d in the time series photometry collected with the TESS satellite, which could suggest stellar pulsations. Other, low-frequency variability is seen as well. Whether these signals are caused by internal gravity waves in the early-type star or by variability in the wind and circumstellar matter currently cannot be distinguished.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - 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)
Result continuities
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
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomical Journal
ISSN
0004-6256
e-ISSN
1538-3881
Volume of the periodical
162
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
150
UT code for WoS article
000697649300001
EID of the result in the Scopus database
2-s2.0-85116376078