Fundamental Parameters of the Eclipsing Binary DD CMa and Evidence for Mass Exchange
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F21%3A00549021" target="_blank" >RIV/67985815:_____/21:00549021 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/1538-3881/abded0" target="_blank" >https://doi.org/10.3847/1538-3881/abded0</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-3881/abded0" target="_blank" >10.3847/1538-3881/abded0</a>
Alternative languages
Result language
angličtina
Original language name
Fundamental Parameters of the Eclipsing Binary DD CMa and Evidence for Mass Exchange
Original language description
We present a detailed photometric and spectroscopic analysis of DD CMa, based on published survey photometry and new spectroscopic data. We find an improved orbital period of P-o = 2.0084530(6) days. Our spectra reveal H beta and H alpha absorptions with weak emission shoulders, and we also find a color excess in the Wide-field Infrared Survey Explorer multiband photometry, interpreted as signatures of circumstellar matter. We model the V-band orbital light curve derived from the ASAS and ASAS-SN surveys, assuming a semidetached configuration and using the mass ratio and temperature of the hotter star derived from our spectroscopic analysis. Our model indicates that the system consists of a B2.5 dwarf and a B9 giant of radii 3.2 and 3.7 R, respectively, orbiting in a circular orbit of radius 6.75 R. We also found M-c = 1.7 0.1 M, T-c = 11,350 100 K, and M-h = 6.4 0.1 M, T-h = 20,000 500 K, for the cooler and hotter star, respectively. We find broad single emission peaks in H alpha and H beta after subtracting the synthetic stellar spectra. Our results are consistent with mass exchange between the stars and suggest the existence of a stream of gas being accreted onto the early B-type star.
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
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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
161
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
165
UT code for WoS article
000626615600001
EID of the result in the Scopus database
2-s2.0-85102471548