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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

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - 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)

Result continuities

  • Project

  • 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