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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/32197
Title: PENELLOPE II. CVSO 104: a pre-main sequence close binary with an optical companion in Ori OB1
Authors: FRASCA, Antonio 
Boffin, H. M. J.
Manara, C. F.
ALCALA', JUAN MANUEL 
Ábrahám, P.
COVINO, Elvira 
Fang, M.
Gangi, Manuele Ettore 
Herczeg, G. J.
Kóspál, Á.
Venuti, L.
Walter, F. M.
ALONSO SANTIAGO, JAVIER 
Grankin, K.
Siwak, M.
Alecian, E.
Cabrit, S.
Issue Date: 2021
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 656
First Page: A138
Abstract: We present results of our study of the close pre-main sequence spectroscopic binary CVSO 104 in Ori OB1, based on data obtained within the PENELLOPE legacy program. We derive, for the first time, the orbital elements of the system and the stellar parameters of the two components. The system is composed of two early M-type stars and has an orbital period of about 5 days and a mass ratio of 0.92, but contrarily to expectations does not appear to have a tertiary companion. Both components have been (quasi-)synchronized, but the orbit is still very eccentric. The spectral energy distribution clearly displays a significant infrared excess compatible with a circumbinary disk. The analysis of HeI and Balmer line profiles, after the removal of the composite photospheric spectrum, reveals that both components are accreting at a similar level. We also observe excess emission in H$\alpha$ and H$\beta$, which appears redshifted or blueshifted by more than 100 km/s with respect to the mass center of the system depending on the orbital phase. This additional emission could be connected with accretion structures, such as funnels of matter from the circumbinary disk. We also analyze the optical companion located at about 2".4 from the spectroscopic binary. This companion, that we named CVSO 104B, turns out to be a background Sun-like star not physically associated with the PMS system and not belonging to Ori OB1.
URI: http://hdl.handle.net/20.500.12386/32197
URL: https://www.aanda.org/articles/aa/full_html/2021/12/aa41686-21/aa41686-21.html
https://www.aanda.org/articles/aa/pdf/2021/12/aa41686-21.pdf
http://arxiv.org/abs/2109.06305v1
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202141686
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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