The young B-star quintuple system HD 155448
Entity
UAM. Departamento de Física TeóricaPublisher
ESODate
2011-09-02Citation
10.1051/0004-6361/201016396
Astronomy and Astrophysics 533 (2011): A54
ISSN
1432-0746 (online); 0004-6361(print)DOI
10.1051/0004-6361/201016396Funded by
Partially supported by the Spanish Project AYA 2008-01727. Support from a Swiss National Science Foundation grant (PP002–110504).Editor's Version
http://dx.doi.org/10.1051/0004-6361/201016396Subjects
Circumstellar matter; ISM: general; Stars: emission-line, Be; Stars: individual: HD 155448; Stars: pre-main sequence; FísicaNote
Astronomy and Astrophysics 533 (2011): A54 reproduced with permission from Astronomy & AstrophysicsRights
© 2011 ESO.Abstract
Until now, HD 155448 has been known as a post-AGB star and listed as a quadruple system. In this paper, we study the system in depth and reveal that the B component itself is a binary and that the five stars HD 155448 A, B1, B2, C, and D likely form a comoving stellar system. From a spectroscopic analysis we derive the spectral types and find that all components are B dwarfs (A: B1V, B1: B6V, B2: B9V, C: B4Ve, D: B8V). Their stellar ages put them close to the ZAMS, and their distance is estimated to be ~2 kpc. Of particular interest is the C component, which shows strong hydrogen and forbidden emission lines at optical wavelengths. All emission lines are spatially extended in the eastern direction and appear to have a similar velocity shift, except for the [Oi] line. In the IR images, we see an arc-like shape to the northeast of HD 155448 C. From the optical up to 10 μm, most circumstellar emission is located at distances between ~1.0″ and 3.0″ from HD 155448 C, while in the Q band the arc-like structure appears to be in contact with HD 155448 C. The Spitzer and VLT/VISIR mid-IR spectra show that the circumstellar material closest to the star consists of silicates, while polycyclic aromatic hydrocarbons (PAH) dominate the emission at distances >1″ with bands at 8.6, 11.3, and 12.7 μm. We consider several scenarios to explain the unusual, asymmetric, arc-shaped geometry of the circumstellar matter. The most likely explanation is an outflow colliding with remnant matter from the star formation process.
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Google Scholar:Schütz, Oliver
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Meeus, Gwendolyn
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Carmona, Andrés
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Juhász, Attila
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Sterzik, Michael F.
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