New brown dwarf candidates in the Pleiades

T. Eisenbeiss; M. Moualla; M. Mugrauer; T. O. B. Schmidt; St Raetz; R. Neuhäuser; Ch Ginski; M. M. Hohle; A. Koeltzsch; C. Marka; W. Rammo; A. Reithe; T. Roell; M. Vaňko

doi:10.1002/asna.200911208

New brown dwarf candidates in the Pleiades

T. Eisenbeiss, M. Moualla, M. Mugrauer, T. O. B. Schmidt, St Raetz, R. Neuhäuser, Ch Ginski, M. M. Hohle, A. Koeltzsch, C. Marka, W. Rammo, A. Reithe, T. Roell, M. Vaňko

Physics

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Abstract

We have performed deep, wide-field imaging on a ∼ 0.4 deg² field in the Pleiades (Melotte 22). The selected field was not yet target of a deep search for low mass stars and brown dwarfs. Our limiting magnitudes are R∼22 mag and I∼20 mag, sufficient to detect brown dwarf candidates down to 40 M_J. We found 197 objects, whose location in the (I, R-I) color magnitude diagram is consistent with the age and the distance of the Pleiades. Using CTK R and I as well as JHK photometry from our data and the 2MASS survey we were able to identify 7 new brown dwarf candidates. We present our data reduction technique, which enables us to resample, calibrate, and co-add many images by just two steps. We estimate the interstellar extinction and the spectral type from our optical and the NIR data using a two-dimensional χ² fitting.

Based on observations obtained with telescopes of the University Observatory Jena, which is operated by the Astrophysical Institute of the Friedrich- Schiller-University.

Table A3 is available at the CDS via http://cdsarc.u-strasbg.fr/pub/cats/J/AN/330/439...

Original language	English
Journal	Astronomische Nachrichten
DOIs	https://doi.org/10.1002/asna.200911208
Publication status	Published - May 2009

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@article{c8eca4c200ac405fab8fd072c571fd63,

title = "New brown dwarf candidates in the Pleiades",

abstract = "We have performed deep, wide-field imaging on a ∼ 0.4 deg2 field in the Pleiades (Melotte 22). The selected field was not yet target of a deep search for low mass stars and brown dwarfs. Our limiting magnitudes are R∼22 mag and I∼20 mag, sufficient to detect brown dwarf candidates down to 40 MJ. We found 197 objects, whose location in the (I, R-I) color magnitude diagram is consistent with the age and the distance of the Pleiades. Using CTK R and I as well as JHK photometry from our data and the 2MASS survey we were able to identify 7 new brown dwarf candidates. We present our data reduction technique, which enables us to resample, calibrate, and co-add many images by just two steps. We estimate the interstellar extinction and the spectral type from our optical and the NIR data using a two-dimensional χ2 fitting. Based on observations obtained with telescopes of the University Observatory Jena, which is operated by the Astrophysical Institute of the Friedrich- Schiller-University. Table A3 is available at the CDS via http://cdsarc.u-strasbg.fr/pub/cats/J/AN/330/439...",

author = "T. Eisenbeiss and M. Moualla and M. Mugrauer and Schmidt, \{T. O. B.\} and St Raetz and R. Neuh{\"a}user and Ch Ginski and Hohle, \{M. M.\} and A. Koeltzsch and C. Marka and W. Rammo and A. Reithe and T. Roell and M. Va{\v n}ko",

year = "2009",

month = may,

doi = "10.1002/asna.200911208",

language = "English",

journal = "Astronomische Nachrichten",

}

TY - JOUR

T1 - New brown dwarf candidates in the Pleiades

AU - Eisenbeiss, T.

AU - Moualla, M.

AU - Mugrauer, M.

AU - Schmidt, T. O. B.

AU - Raetz, St

AU - Neuhäuser, R.

AU - Ginski, Ch

AU - Hohle, M. M.

AU - Koeltzsch, A.

AU - Marka, C.

AU - Rammo, W.

AU - Reithe, A.

AU - Roell, T.

AU - Vaňko, M.

PY - 2009/5

Y1 - 2009/5

N2 - We have performed deep, wide-field imaging on a ∼ 0.4 deg2 field in the Pleiades (Melotte 22). The selected field was not yet target of a deep search for low mass stars and brown dwarfs. Our limiting magnitudes are R∼22 mag and I∼20 mag, sufficient to detect brown dwarf candidates down to 40 MJ. We found 197 objects, whose location in the (I, R-I) color magnitude diagram is consistent with the age and the distance of the Pleiades. Using CTK R and I as well as JHK photometry from our data and the 2MASS survey we were able to identify 7 new brown dwarf candidates. We present our data reduction technique, which enables us to resample, calibrate, and co-add many images by just two steps. We estimate the interstellar extinction and the spectral type from our optical and the NIR data using a two-dimensional χ2 fitting. Based on observations obtained with telescopes of the University Observatory Jena, which is operated by the Astrophysical Institute of the Friedrich- Schiller-University. Table A3 is available at the CDS via http://cdsarc.u-strasbg.fr/pub/cats/J/AN/330/439...

AB - We have performed deep, wide-field imaging on a ∼ 0.4 deg2 field in the Pleiades (Melotte 22). The selected field was not yet target of a deep search for low mass stars and brown dwarfs. Our limiting magnitudes are R∼22 mag and I∼20 mag, sufficient to detect brown dwarf candidates down to 40 MJ. We found 197 objects, whose location in the (I, R-I) color magnitude diagram is consistent with the age and the distance of the Pleiades. Using CTK R and I as well as JHK photometry from our data and the 2MASS survey we were able to identify 7 new brown dwarf candidates. We present our data reduction technique, which enables us to resample, calibrate, and co-add many images by just two steps. We estimate the interstellar extinction and the spectral type from our optical and the NIR data using a two-dimensional χ2 fitting. Based on observations obtained with telescopes of the University Observatory Jena, which is operated by the Astrophysical Institute of the Friedrich- Schiller-University. Table A3 is available at the CDS via http://cdsarc.u-strasbg.fr/pub/cats/J/AN/330/439...

U2 - 10.1002/asna.200911208

DO - 10.1002/asna.200911208

M3 - Article

JO - Astronomische Nachrichten

JF - Astronomische Nachrichten

ER -

New brown dwarf candidates in the Pleiades

Abstract

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