dc.creator | Rodriguez Ledesma, María V. | |
dc.creator | Mundt, Reinhard | |
dc.creator | Pintado, Olga Ines | |
dc.creator | Boudreault, Steve | |
dc.creator | Hessman, Frederic | |
dc.creator | Herbst, William | |
dc.date.accessioned | 2017-10-10T17:10:42Z | |
dc.date.accessioned | 2018-11-06T12:57:34Z | |
dc.date.available | 2017-10-10T17:10:42Z | |
dc.date.available | 2018-11-06T12:57:34Z | |
dc.date.created | 2017-10-10T17:10:42Z | |
dc.date.issued | 2013-02 | |
dc.identifier | Rodriguez Ledesma, María V.; Mundt, Reinhard; Pintado, Olga Ines; Boudreault, Steve; Hessman, Frederic; et al.; The spectral type of CHS 7797 - an intriguing very low mass periodic variable in the Orion Nebula Cluster; EDP Sciences; Astronomy and Astrophysics; 551; 2-2013; 1-6; A44 | |
dc.identifier | 0004-6361 | |
dc.identifier | http://hdl.handle.net/11336/26366 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1871617 | |
dc.description.abstract | Aims: We present the spectroscopic characterization of the unusual high-amplitude very low mass pre-main-sequence periodic variable CHS 7797. Methods: This study is based on optical medium-resolution (R = 2200) spectroscopy in the 6450 − 8600 Å range, carried out with GMOS-GEMINI -S in March 2011. Observations of CHS 7797 have been carried out at two distinct phases of the 17.8 d period, namely at maximum (I ≈ 17.4 mag) and four days before maximum (I ≈ 18.5 mag). Four different spectral indices were used for the spectral classification at these two phases, all of them well-suited for spectral classification of young and obscured late M dwarfs. In addition, the gravity-sensitive Na I (8183/8195 Å) and K I (7665/7699 Å) doublet lines were used to confirm the young age of CHS 7797. Results: From the spectrum obtained at maximum light we derived a spectral type (SpT) of M 6.05 ± 0.25, while for the spectrum taken four days before maximum the derived SpT is M 5.75 ± 0.25. The derived SpTs confirm that CHS 7797 has a mass in the stellar-substellar boundary mass range. In addition, the small differences in the derived SpTs at the two observed phases may provide indirect hints that CHS 7797 is a binary system of similar mass components surrounded by a tilted circumbinary disk, a system similar to KH 15D. | |
dc.language | eng | |
dc.publisher | EDP Sciences | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201219748 | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2013/03/aa19748-12/aa19748-12.html | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.subject | Stars: low-mass | |
dc.subject | Pre main sequence stars | |
dc.subject | Brown dwarfs | |
dc.subject | Stars: variable, binary | |
dc.subject | Spectroscopy | |
dc.title | The spectral type of CHS 7797 - an intriguing very low mass periodic variable in the Orion Nebula Cluster | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |